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1
Mameri, Daniel, Corina van Kammen, Ton G. G. Groothuis, Ole Seehausen, and Martine E. Maan. "Visual adaptation and microhabitat choice in Lake Victoria cichlid fish." Royal Society Open Science 6, no. 3 (March 2019): 181876. http://dx.doi.org/10.1098/rsos.181876.
Повний текст джерелаАнотація:
When different genotypes choose different habitats to better match their phenotypes, genetic differentiation within a population may be promoted. Mating within those habitats may subsequently contribute to reproductive isolation. In cichlid fish, visual adaptation to alternative visual environments is hypothesized to contribute to speciation. Here, we investigated whether variation in visual sensitivity causes different visual habitat preferences, using two closely related cichlid species that occur at different but overlapping water depths in Lake Victoria and that differ in visual perception ( Pundamilia spp.). In addition to species differences, we explored potential effects of visual plasticity, by rearing fish in two different light conditions: broad-spectrum (mimicking shallow water) and red-shifted (mimicking deeper waters). Contrary to expectations, fish did not prefer the light environment that mimicked their typical natural habitat. Instead, we found an overall preference for the broad-spectrum environment. We also found a transient influence of the rearing condition, indicating that the assessment of microhabitat preference requires repeated testing to control for familiarity effects. Together, our results show that cichlid fish exert visual habitat preference but do not support straightforward visual habitat matching.
2
Bassa, Samuel, Dickson Oteino Owiti, Eric Ogello, Albert Getabu, Levi Ivor Muhoozi, Herbert Nakiyende, Winnie Nkalubo, et al. "Ecosystem Integrity of the Upper Victoria Nile in East Africa based on Habitat and Fish Species Biotic Indices." Uganda Journal of Agricultural Sciences 19, no. 1 (November 5, 2020): 33–49. http://dx.doi.org/10.4314/ujas.v19i1.4.
Повний текст джерелаАнотація:
Riverine ecosystems are continuously been compromised by human activities resulting in threatening their integrity. In this study, integrity of Upper Victoria Nile River was assessed using habitat quality and fish biotic indices. Experimental gillnetting was done bi-annually in 9 stations along the river from 2008 to 2018. Nine habitat metrics were used to estimate habitat quality index at every sampling station. Fish sampled, were sorted, identified to species level, and weighed. Counts of introduced and indigenous as well as tolerant and intolerant species were recorded to generate species richness. A total of 10.642 fish, 65 species belonging to nine families were recorded. Dominant species were Lates niloticus 62.79%, Oreochromis niloticus 23.51%, Mormyrus kannume 13.64%; other species were ≤0.06%. Tolerance and trophic guild showed carnivores (61.5%), omnivores (21.5%) and detrivores (16.9%).Mean habitat quality index, total fish catch and fish-based index of biotic integrity varied among stations with highest record of 26.6±6.9, 289.2±51.8 and 30.6±7.9 at sampling station (ST4) respectively. The lowest was 19.4±7.3, 93.1±13.2 and 26.7±6.8 at sampling station (ST2) respectively. On a spatial basis, indices recorded significant differences among stations (p < 0.05). Results indicated a fair fisheries biodiversity that need better conservation management of habitat type of the upper Nile.
3
Pollino, Carmel A., Pat Feehan, Michael R. Grace, and Barry T. Hart. "Fish communities and habitat changes in the highly modified Goulburn Catchment, Victoria, Australia." Marine and Freshwater Research 55, no. 8 (2004): 769. http://dx.doi.org/10.1071/mf03180.
Повний текст джерелаАнотація:
Evidence for the decline in native fish communities in the lowland Goulburn Catchment has been based primarily on studies investigating changes to environmental conditions as a result of river regulation. The present study aggregates historical fisheries data to spatially compare native fish communities in different parts of the catchment. Multivariate analyses demonstrate that distinctly different community compositions are found in different parts of the catchment. Eildon Dam, a deep release reservoir, has drastically altered the hydrology and water quality of the upper Goulburn River, and ordination analyses show that this has created both physical and artificial barriers to movement of native fish into the main channel. Concurrently, fisheries data from the upper main channel show the community is highly divergent compared to the remaining catchment. Further downstream, Goulburn Weir creates a barrier to fish movement between Lake Nagambie and the lower Goulburn Catchment, and alters the natural hydrological regime. Similarity Percentage analyses demonstrate that these stressors have facilitated the establishment of alien species, which dominate fish abundance in the upper and lower main channels. The current study emphasises the need to explore alternatives for improving management strategies to rehabilitate fish communities throughout the Goulburn Catchment.
4
Dinelka Thilakarathne and Gayan Hirimuthugoda. "Can the Sri Lankan endemic-endangered fish Labeo fisheri (Teleostei: Cyprinidae) adapt to a new habitat?" Journal of Threatened Taxa 14, no. 8 (August 26, 2022): 21579–87. http://dx.doi.org/10.11609/jott.7621.14.8.21579-21587.
Повний текст джерелаАнотація:
Labeo fisheri is an endemic and endangered freshwater fish of Sri Lanka. Mainly restricted to the upper reaches of the Mahaweli River basin, it has been previously reported living in deep rapids and among large rocks and boulders. An accidental record of a Labeo fisheri specimen from Victoria Reservoir led us to further study this habitat during the period from January to August 2017. This study was carried out to confirm the presence of a population of Labeo fisheri within the Victoria Reservoir and report its new habitat type in deep stagnant waters. We further investigated the food habits by analyzing the gut contents of L. fisheri in the Victoria Reservoir. Seven individuals were recorded from fishermen’s gill net catch in three fish landing sites along Victoria Reservoir, with an average total length of 24.80 ± 4.30 cm, average standard length of 19.70 ± 3.86 cm and average body weight of 197.69 ± 107.12 g. Based on gut content analysis, only phytoplankton, especially diatoms and cyanobacteria, were found in the gut of L. fisheri. This new population is facing the direct threat of fishing. Effective conservation measures are doubtful, since a fishery is well established in the Victoria Reservoir and the fishing gear used is not species-specific. More research is necessary to understand the population dynamics of L. fisheri in the Victoria Reservoir. In order to conserve it at this locality, community-based conservation measures are recommended.
5
Morris, Liz, and David Ball. "Habitat suitability modelling of economically important fish species with commercial fisheries data." ICES Journal of Marine Science 63, no. 9 (January 1, 2006): 1590–603. http://dx.doi.org/10.1016/j.icesjms.2006.06.008.
Повний текст джерелаАнотація:
Abstract In this study we used catch and effort data from a commercial fishery to generate habitat suitability models for Port Phillip Bay, Victoria, Australia. Species modelled were King George whiting (Sillaginodes punctata), greenback flounder (Rhombosolea tapirina), Australian salmon (Arripis trutta and A. truttaceus), and snapper (Pagrus auratus). Locations of commercial catches were reported through a grid system of fishing blocks. Spatial analyses in a Geographic Information System (GIS) were applied to describe each fishing block by its habitat area. A multivariate approach was adopted to group each fishing block by its dominant habitats. Standardized catch per unit effort values were overlaid on these groups to identify those that returned high or low catches for each species. A simple set of rules was then devised to predict the habitat suitability for each habitat combination in a fishing block. The spatial distribution of these habitats was presented in a GIS. These habitat suitability models were consistent with existing anecdotal information and expert opinion. While the models require testing, we have shown that in the absence of adequate fishery-independent data, commercial catch and effort data can be used to produce habitat suitability models at a bay-wide scale.
6
Slawski, Thomas M., and Timothy J. Ehlinger. "Fish Habitat Improvement in Box Culverts: Management in the Dark?" North American Journal of Fisheries Management 18, no. 3 (August 1998): 676–85. http://dx.doi.org/10.1577/1548-8675(1998)018<0676:fhiibc>2.0.co;2.
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Brittain, John E., Jon Arne Eie, Age Brabrand, Svein Jakob Saltveit, and Jan Heggenes. "Improvement of fish habitat in a Norwegian river channelization scheme." Regulated Rivers: Research & Management 8, no. 1-2 (May 1993): 189–94. http://dx.doi.org/10.1002/rrr.3450080121.
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Rodwell, Lynda D., Edward B. Barbier, Callum M. Roberts, and Tim R. McClanahan. "The importance of habitat quality for marine reserve fishery linkages." Canadian Journal of Fisheries and Aquatic Sciences 60, no. 2 (February 1, 2003): 171–81. http://dx.doi.org/10.1139/f03-009.
Повний текст джерелаАнотація:
We model marine reserve fishery linkages to evaluate the potential contribution of habitat-quality improvements inside a marine reserve to fish productivity and fishery catches. Data from Mombasa Marine National Park, Kenya, and the adjacent fishery are used. Marine reserves increase total fish biomass directly by providing refuge from exploitation and indirectly by improving fish habitat in the reserve. As natural mortality of the fish stock decreases in response to habitat enhancement in the reserve, catches increase by up to 2.6 tonnes (t)·km2·year1 and total fish biomass by up to 36 t·km2. However, if habitat-quality improvement reduces the propensity of fish to move out of the reserve, catches may fall by up to 0.9 t·km2·year1. Our results indicate that habitat protection in reserves can underpin fish productivity and, depending on its effects on fish movements, augment catches.
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Colton, Madhavi A., and Stephen E. Swearer. "Locating faunal breaks in the nearshore fish assemblage of Victoria, Australia." Marine and Freshwater Research 63, no. 3 (2012): 218. http://dx.doi.org/10.1071/mf10322.
Повний текст джерелаАнотація:
Marine communities are frequently biogeographically structured, despite the potential for dispersal. Previous research on a variety of marine taxa in south-eastern Australia has suggested that a biogeographic break occurs along the coastline of Victoria. However, little of this research has focussed on nearshore ichthyofauna and the location of the break remains debated. Using fish abundance measured by two methods: underwater visual census (UVC); and baited remote underwater video (BRUV) at six locations along the open coast of Victoria, we examined (1) whether there is sufficient concordance among species to indicate the presence of a faunal break; and if present (2) where any such breaks occur. Differences in assemblage composition between locations were tested with analyses of similarity and examination of residuals from regressions of pairwise dissimilarities against coastline distance. Data collected using UVC revealed two large faunal breaks co-located with a habitat discontinuity, the convergence of two currents and a thermal gradient. Data collected by BRUV revealed only a gradation of change across the study region. Greater understanding of the biogeographic structure of these communities will facilitate more effective management, especially in light of anticipated range shifts in response to global climate change.
10
Olwa, Richard, Herbert Nakiyende, Elias Muhumuza, Samuel Bassa, Anthony Taabu-Munyaho, and Winnie Nkalubo. "Ecology of the Critically Endangered Singidia Tilapia (Teleostei: Cichlidae: Oreochromis esculentus) of lake Kayanja, Uganda and its conservation implications." Journal of Threatened Taxa 12, no. 10 (July 26, 2020): 16251–56. http://dx.doi.org/10.11609/jott.5700.12.10.16251-16256.
Повний текст джерелаАнотація:
Singidia Tilapia Oreochromis esculentus is a Critically Endangered native tilapia fish species endemic to lakes Victoria and Kyoga basins of East Africa, however, it disappeared from these main lakes due to overfishing, environmental degradation and predation by the introduced Nile Perch Lates niloticus. Remnant populations of this fish species is now restricted to satellite lakes including Lake Kayanja of the Victoria basin. This study provides updated information about the population abundance, critical habitat, threats and diet of Singidia Tilapia to inform conservation decisions to revive its populations in the wild. Fish data collection and mapping of nursery and breeding habitats of Singidia Tilapia on Lake Kayanja was conducted between February 2016 and October 2017. In all the areas mapped and sampled, Singidia Tilapia (with a size range of 11–27 cm TL) was the most abundant (43%) relative to exotic Nile Tilapia Oreochromis niloticus (21%) and Redbelly Tilapia Coptodon zillii (36%). The emergence of introduced (exotic) tilapias like Nile Tilapia recorded in this study could be attributed to cage fish farming being carried out in this Lake. The diet of Oreochromis esculentus consisted mainly of detritus (60.8 %), plant materials (27.7%) and blue-green algae (5.5%). Destruction of critical habitats and presence of introduced fish species were noted as the major threats to this fish and its habitats. The generated information could contribute to guiding stakeholders to undertake appropriate actions to conserve this threatened fish species and its habitats.
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Che, Xuan, Xingguo Liu, Jun Zhang, Bin He, Changfeng Tian, Yin Zhou, Xiaolong Chen, and Lin Zhu. "Fish Habitat Reclamation Based on Geographical Morphology Heterogeneity in the Yangtze River and the Short-Term Effects on Fish Community Structure." Water 14, no. 10 (May 12, 2022): 1554. http://dx.doi.org/10.3390/w14101554.
Повний текст джерелаАнотація:
Human alterations, such as hydropower development, are intensive and have negative impacts on fish and ecological environment. However, fish habitat restoration projects based on geographical morphology have not yet been reported in the Yangtze River. To explore engineering measures used to restore fish habitat structure and function, a mesoscale fish habitat restoration project was designed and constructed, which included restructuring of habitat topography in the fluctuating area. Three-dimensional computational fluid dynamics (CFD) models were used to simulate and predict the project’s effect on the hydromorphology prior to construction, and an Acoustic Doppler current profiler (ADCP) was deployed to test and verify actual flow field improvement. Short-term effects on fish species sorting and their main ecological traits were examined. The results showed that vorticity and flow heterogeneity in the river reach increased, suggesting that the restoration projects created flow conditions favourable to indigenous fishes. Thus, pre-optimization using computer simulation is an essential and scientific procedure that could be used to increase the probability of river restoration success. The promotion of habitat diversity had strong effects on fish aggregation, especially for the rare and endemic fish species targeted. Fish abundance, catch biomass and species richness increased by 98.1%, 62.7% and 22.5%, respectively. There were significant differences (p < 0.05) in species number and catch abundance before and after the project. The number of rare and endemic fish species increased from four to nine species. Overall, this research provides evidence that the promotion of habitat hydraulic morphology heterogeneity accelerates the recovery of fish diversity and biomass.
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Adeva-Bustos, Ana, Knut Alfredsen, Hans-Petter Fjeldstad, and Kenneth Ottosson. "Ecohydraulic Modelling to Support Fish Habitat Restoration Measures." Sustainability 11, no. 5 (March 12, 2019): 1500. http://dx.doi.org/10.3390/su11051500.
Повний текст джерелаАнотація:
Despite that hydromorphological restoration projects have been implemented since the 1940s, the key to improve the effectiveness of future restoration measures remains a challenge. This is in part related to the lack of adequate aims and objectives together with our limitations in understanding the effects on the physical habitat and ecosystems from interventions. This study shows the potential of using remote sensing techniques combined with hydraulic modelling to evaluate the success of physical restoration measures using habitat suitability as a quantifiable objective. Airborne light detection and ranging (LiDAR) was used to build a high-resolution two-dimensional model for Ljungan River, Sweden, using HEC-RAS 5.0. Two types of instream restoration measures were simulated according to the physical measures carried out in the river to improve salmonid habitat: (a) stones and rocks were moved from the bank sides to the main channel, and (b) a concrete wall was broken to open two channels to connect a side channel with the main river. Results showed that the hydraulic model could potentially be used to simulate the hydraulic conditions before and after instream modifications were implemented. A general improvement was found for the potential suitable habitat based on depth, velocity and shear stress values after the instream measures.
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Koster, W. M., D. R. Dawson, J. R. Morrongiello, and D. A. Crook. "Spawning season movements of Macquarie perch (Macquaria australasica) in the Yarra River, Victoria." Australian Journal of Zoology 61, no. 5 (2013): 386. http://dx.doi.org/10.1071/zo13054.
Повний текст джерелаАнотація:
The Macquarie perch (Macquaria australasica) is a threatened fish species that inhabits rivers and impoundments in south-eastern Australia. Previous studies have shown that Macquarie perch in impoundments exhibit synchronised upstream spawning migrations to shallow, fast-flowing habitats in the lower reaches of inflowing streams. There has been little study of movement behaviours of entirely riverine populations of Macquarie perch despite this being the species’ natural habitat. Here, radio-telemetry is used to test the hypothesis that riverine populations exhibit synchronised migrations during the spawning season. Thirty Macquarie perch in the Yarra River, Victoria, a translocated population outside of the species’ natural range, were radio-tagged before the late spring–early summer spawning season and their movements followed over a 10-month period (May 2011 to February 2012). Tagged fish typically occupied restricted reaches of stream (<450 m). Sixteen of the fish undertook occasional upstream or downstream movements (~250–1000 m) away from their usual locations, particularly associated with large flow variations during the spawning season. There was no evidence of synchronised migratory behaviour or movement of multiple fish to specific locations or habitats during the spawning season. Whilst further research over more years is needed to comprehensively document the spawning-related behaviours of riverine Macquarie perch, our study demonstrates that management of riverine populations of this threatened species cannot necessarily be based on the model of spawning behaviour developed for lacustrine populations.
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Kang, Hyeongsik, and Jun Wook Hur. "Aquatic Ecosystem Assessment and Habitat Improvement Alternative in Hongcheon River using Fish Community." Journal of The Korean Society of Civil Engineers 32, no. 5B (September 15, 2012): 331–43. http://dx.doi.org/10.12652/ksce.2012.32.5b.331.
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Boavida, I., J. M. Santos, R. V. Cortes, A. N. Pinheiro, and M. T. Ferreira. "Assessment of instream structures for habitat improvement for two critically endangered fish species." Aquatic Ecology 45, no. 1 (August 27, 2010): 113–24. http://dx.doi.org/10.1007/s10452-010-9340-x.
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Person, Emilie, Martin Bieri, Armin Peter, and Anton J. Schleiss. "Mitigation measures for fish habitat improvement in Alpine rivers affected by hydropower operations." Ecohydrology 7, no. 2 (April 3, 2013): 580–99. http://dx.doi.org/10.1002/eco.1380.
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Hicks, Andy, Nicole C. Barbee, Stephen E. Swearer, and Barbara J. Downes. "Estuarine geomorphology and low salinity requirement for fertilisation influence spawning site location in the diadromous fish, Galaxias maculatus." Marine and Freshwater Research 61, no. 11 (2010): 1252. http://dx.doi.org/10.1071/mf10011.
Повний текст джерелаАнотація:
In habitats such as estuaries, which are characterised by large and fluctuating gradients in abiotic variables, finding appropriate habitat for successful spawning and egg development can be critical to a species’ survival. We explored how salinity requirements for successful fertilisation may govern the distribution of estuarine spawning habitat for the diadromous fish, Galaxias maculatus, which spawns in inundated vegetation on estuary banks during spring tides. Artificial fertilisation experiments confirmed that successful fertilisation only occurs at low salinities (<20). Thus, we predicted that egg distributions would depend upon the extent of low-salinity surface waters in an estuary. Using estuary geomorphology classification schemes, which classify estuaries by physical and chemical characteristics such as their salinity dynamics, we hypothesised that stratified estuaries would provide a greater extent of low salinity surface water than well-mixed estuaries. This prediction was supported by surveys of egg distributions in five estuaries in Victoria, Australia. Eggs were distributed over a greater proportion of ‘stratified’ v. ‘mixed’ estuary types. We suggest that combining knowledge of the spawning requirements of a species and physical properties of the habitat, such as those encapsulated in estuary geomorphic classification schemes, can greatly facilitate efforts to identify critical habitats and thus aid in species management and conservation.
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Jones, Nicholas E., William M. Tonn, Garry J. Scrimgeour, and Chris Katopodis. "Productive capacity of an artificial stream in the Canadian Arctic: assessing the effectiveness of fish habitat compensation." Canadian Journal of Fisheries and Aquatic Sciences 60, no. 7 (July 1, 2003): 849–63. http://dx.doi.org/10.1139/f03-074.
Повний текст джерелаАнотація:
Few fish habitat compensation projects are assessed with respect to the principle of "no net loss" of productive capacity. Using reference streams as standards against which gains and losses of functions (e.g., production of fish) could be quantified, we examined the effectiveness of a 3.4-km artificial stream in the Northwest Territories, Canada. The artificial stream restored watershed connectivity, allowing fish migration and provided spawning and nursery habitat, particularly for Arctic grayling (Thymallus arcticus). However, the average mass of young-of-the-year (YOY) grayling at the end of summer was lower (57%) in the artificial stream than in natural streams. This difference in growth, in concert with estimates of grayling density, meant that the standing crop produced in the artificial stream averaged 37% of that found in natural streams. A bioenergetics model indicated that cooler water temperatures in the artificial stream had limited influence on growth. Instead, low amounts of autochthonous and allochthonous organic matter and poor physical habitat in the artificial stream appeared to limit the productivity of benthic invertebrates and fish. Our explicit analysis of productive capacity will allow future compensation measures to focus on deficiencies in the artificial stream and on the improvement of its productive capacity as fish habitat.
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Kim, Seog Hyun, Dana Kim, and Kang-Hyun Cho. "Evaluation of Habitat Improvement Using Two-Dimensional Fish Habitat Modeling after the Connectivity Restoration in an Isolated Former Channel." Ecology and Resilient Infrastructure 2, no. 2 (June 30, 2015): 137–46. http://dx.doi.org/10.17820/eri.2015.2.2.137.
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Alves, Carlos Bernardo Mascarenhas, Paulo Santos Pompeu, Rosana Mazzoni, and Marcelo Fulgêncio Guedes Brito. "AVANÇOS EM MÉTODOS DE COLETA DE PEIXES E CARACTERIZAÇÃO DE HABITAT DE RIACHOS TROPICAIS." Oecologia Australis 25, no. 02 (June 16, 2021): 246–65. http://dx.doi.org/10.4257/oeco.2021.2502.03.
Повний текст джерелаАнотація:
This paper brings some advances in fish data sampling and stream environments. Since the publication in 1999 of volume VI “Ecology of Stream Fishes” in the former Oecologia Brasiliensis journal, today Oecologia Australis, several progresses have occurred. Several methods of collecting fish themselves, have remained the same. However, in relation to the use of electric fishing, collection of eggs and fish larvae, and characterization of physical habitats in streams, there was remarkable development and improvement. The purpose of this article is to present the “state of the art” of these three aspects of sampling fish and habitats in streams. By the end, preparation methods of samples for genetic, stable isotopes and heavy metal analyses are briefly presented
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Cohen, Brian F., David R. Currie, and Matthew A. McArthur. "Epibenthic community structure in Port Phillip Bay, Victoria, Australia." Marine and Freshwater Research 51, no. 7 (2000): 689. http://dx.doi.org/10.1071/mf00027.
Повний текст джерелаАнотація:
Epibenthic community structure in Port Phillip Bay was examined from quantitative diver samples collected at 30 depth-stratified stations during 1998. Analysis of variance showed a strong trend of decreasing epibenthic abundance, biomass and species diversity with depth. Reductions in these three parameters were most pronounced over shallow inshore waters and could be attributed largely to decreases in the abundance of the heavy, mat-forming ascidian Pyura stolonifera with depth. Four epifaunal community groupings, closely reflecting differences in sediment and habitat type within the bay, were identified from ordinations of species abundance and biomass data. The four epifaunal groupings also closely matched distributional patterns observed in other studies in both demersal fish and infaunal communities. Epifaunal communities in the bay were dominated by filter-feeding organisms which accounted for nearly 95% of the total species abundance and 98% of the total species biomass. Seven of the 63 epibenthic organisms collected during the survey are exotic introductions to the bay (Sabella spallanzanii, Ascidiella aspersa, Styela clava, Styela plicata, Ciona intestinalis, Pyromaia tuberculata and Asterias amurensis). As many of these species are widespread and abundant (35% of all individuals), their effects on the ecology of Port Phillip Bay are likely to be significant.
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Robinson, Ann Y. "Sustainable agriculture: The wildlife connection." American Journal of Alternative Agriculture 6, no. 4 (December 1991): 161–67. http://dx.doi.org/10.1017/s0889189300004203.
Повний текст джерелаАнотація:
AbstractWildlife and fish have much to gain from the movement toward alternative, sustainable agricultural practices. Interrelated reasons for the habitat improvements to be expected from a change to sustainable systems include reduced use of agricultural chemicals, better care of the soil, and reintroduction of greater landscape diversity. The most well-documented benefits would result from reduced use of agrichemicals, which often are toxic and frequently change the structure and composition of available food and cover. The wildlife benefits of erosion prevention and landscape diversification are less well-documented but may be as significant for habitat improvement. The opportunities to enhance habitat using sustainable farming methods are beginning to receive increased attention from wildlife professionals. As a result, efforts are under way to expand use of sustainable methods on farmlands managed by the U.S. Fish and Wildlife Service.
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Voicu, Răzvan, Doru Bănăduc, Eric Kay, Erika Schneider-Binder, and Angela Curtean-Bănăduc. "Improvement of lateral connectivity in a sector of River Hârtibaciu (Olt/Danube Basin)." Transylvanian Review of Systematical and Ecological Research 19, no. 2 (June 1, 2017): 53–68. http://dx.doi.org/10.1515/trser-2017-0013.
Повний текст джерелаАнотація:
Abstract The Hârtibaciu River in the Alţâna area has a disturbed lateral connectivity owing to its lateral embankments, as a result of which fish communities in this river sector are negatively influenced. The method of obtaining the water supply for a new proposed wetland is by gravitation, and any excessive water supply to the wetland will be controled and directed to the Hârtibaciu River in a natural manner. A state-of-the-art man-made wetland should increase the quality of the habitat for local fish communities, especially for the Rhodeus sericeus population, which is a species of conservation interest.
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Wright, Daniel Shane, Emma Rietveld, and Martine E. Maan. "Developmental effects of environmental light on male nuptial coloration in Lake Victoria cichlid fish." PeerJ 6 (January 3, 2018): e4209. http://dx.doi.org/10.7717/peerj.4209.
Повний текст джерелаАнотація:
BackgroundEfficient communication requires that signals are well transmitted and perceived in a given environment. Natural selection therefore drives the evolution of different signals in different environments. In addition, environmental heterogeneity at small spatial or temporal scales may favour phenotypic plasticity in signaling traits, as plasticity may allow rapid adjustment of signal expression to optimize transmission. In this study, we explore signal plasticity in the nuptial coloration of Lake Victoria cichlids,Pundamilia pundamiliaandPundamilia nyererei.These two species differ in male coloration, which mediates species-assortative mating. They occur in adjacent depth ranges with different light environments. Given the close proximity of their habitats, overlapping at some locations, plasticity in male coloration could contribute to male reproductive success but interfere with reproductive isolation.MethodsWe rearedP. pundamilia,P. nyererei,and their hybrids under light conditions mimicking the two depth ranges in Lake Victoria. From photographs, we quantified the nuptial coloration of males, spanning the entire visible spectrum. In experiment 1, we examined developmental colour plasticity by comparing sibling males reared in each light condition. In experiment 2, we assessed colour plasticity in adulthood, by switching adult males between conditions and tracking coloration for 100 days.ResultsWe found that nuptial colour inPundamiliadid respond plastically to our light manipulations, but only in a limited hue range. Fish that were reared in light conditions mimicking the deeper habitat were significantly greener than those in conditions mimicking shallow waters. The species-specific nuptial colours (blue and red) did not change. When moved to the opposing light condition as adults, males did not change colour.DiscussionOur results show that species-specific nuptial colours, which are subject to strong divergent selection by female choice, are not plastic. We do find plasticity in green coloration, a response that may contribute to visual conspicuousness in darker, red-shifted light environments. These results suggest that light-environment-induced plasticity in male nuptial coloration inP. pundamiliaandP. nyerereiis limited and does not interfere with reproductive isolation.
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RAZAK, ABDUL. "The diversity of chemical compounds of bilih fish body (Mystacoleucus padangensis) originating from Lake Toba and Lake Singkarak, Sumatra, Indonesia." Biodiversitas Journal of Biological Diversity 19, no. 4 (July 1, 2018): 1552–57. http://dx.doi.org/10.13057/biodiv/d190448.
Повний текст джерелаАнотація:
Razak A. 2018. The diversity of chemical compounds of bilih fish body (Mystacoleucus padangensis Bleeker) originating fromLake Toba and Lake Singkarak, Sumatra, Indonesia. Biodiversitas 19: 1552-1557. Bilih fish (Mystacoleucus padangensis) is anendemic fish in Lake Singkarak, West Sumatra. Bilih fish in Lake Singkarak experiencing pressure due to human activities that destroythe habitat of this fish in Lake Singkarak. The improvement of bilih fish habitat conducted by the government by introducing bilih fishto Lake Toba for bilih fish preservation. The purpose of this study is to describe the diversity of chemical compounds and their relationto several ecological factors that influence bilih fish in Lake Toba and Lake Singkarak. The research method is survey method. Bilih fishtaken at three to four points on both Lakes. The distance between sample points is 8000 m. The result of this research is to find themorphology of bilih fish from Lake Toba bigger than bilih Lake Singkarak fish. The bilih fish Fins of Lake Toba have a 52.08% CaOcompound (per 100 ppm sample), the fins of Lake Singkarak have a 53% CaO compound higher than Lake Toba, 51%. The content ofBilih Lake Toba fish muscle has P2O5 compounds 34,48% higher than Lake Singkarak with P2O5 34.58% higher, Bilih Danau Toba fishbone has CaO 57.66%, from Lake Singkarak 60,83%. Bilih Lake Toba has 97.32% Fluoride compound, higher than Lake Singkarak98.43%. The ecological conditions in Lake Toba are relatively similar to the condition of the waters in Lake Singkarak.
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Koehn, JD, NA O'Connor, and PD Jackson. "Seasonal and size-related variation in microhabitat use by a southern Victorian stream fish assemblage." Marine and Freshwater Research 45, no. 7 (1994): 1353. http://dx.doi.org/10.1071/mf9941353.
Повний текст джерелаАнотація:
Microhabitat use by a stream fish assemblage was examined bimonthly at 51 sites along Armstrong Creek, Victoria, Australia, for 12 months. Five species-river blackfish (Gadopsis marmoratus), short-finned eel (Anguilla australis), short-headed lamprey (Mordacia mordax), and the exotic species brown trout (Salmo trutta) and roach (Rutilus rutilus)-were collected. Because blackfish were abundant, length-frequency data could be used to distinguish three size groups, corresponding approximately to cohorts of Years 0, 1 and 2+. Twenty-seven habitat variables were measured at each site, and these were reduced by principalcomponents analysis to eight major components. Densities of each blackfish size group and of eels, trout and lamprey showed significant correlations with one or more components. The mean preferred water depth of blackfish increased with fish size. Small blackfish could be found in water ranging from 10 to 50 cm deep, but large blackfish were restricted to depths greater than 20 cm and could be found at depths greater than 50 cm. All species showed preferences for water velocities less than 20 cm s-1. There was also a relationship between fish size and the size of shelter available among substratum interstices.
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Kim, Jung-Jae, Usman Atique, and Kwang-Guk An. "Long-Term Ecological Health Assessment of a Restored Urban Stream Based on Chemical Water Quality, Physical Habitat Conditions and Biological Integrity." Water 11, no. 1 (January 10, 2019): 114. http://dx.doi.org/10.3390/w11010114.
Повний текст джерелаАнотація:
We studied the chemical water quality, physical habitat and biotic integrity of an urban stream subjected to restoration measures in South Korea. We used the water pollution index (WPI), qualitative habitat evaluation index (QHEI) and index of biotic integrity (IBI) on the water quality, physical habitat and fish assemblage data respectively, during 2007–2016 in Gap Stream to evaluate the ecological health before and after restoration measures. The results revealed annual mean total phosphorus (TP) dramatically decreased by 13-fold for 10 years and the values of biological oxygen demand (BOD) and chemical oxygen demand (COD) also decreased by >50% over the time, indicating decrease in nutrient enrichment and organic matter pollution after restoration measures. In the meantime, biological health analyses using IBI indicated no major transformation in fish assemblages under restoration impact. However, the proportion of sensitive species increased, and tolerant species decreased after restoration. Gap stream is home to 50 distinct fish species. QHEI proposed that the physical habitat health was in ‘good’ condition during the study period. WPI showed the chemical water quality status remained ‘poor’ during and before restoration but improved to ‘fair-good’ condition in the ensuing years after restoration. The IBI results, however, indicated ‘very poor-poor’ biotic integrity irrespective of restoration measures. CHL-a and TP showed strong (r < 0.7) to moderately strong (r = 0.5–0.7) correlation with significantly important water quality factors. Spatially significant pattern change in TN and TP was obvious as measured levels were significantly higher (p < 0.01) in downstream than upstream. Principal component analysis successfully indicated the placement of water quality factors and indices used as in three distinct stream compartments. The higher pollutant levels in the downstream mainly linked to the nutrient-rich effluents from emerging from the wastewater treatment plants (WWTPs) and industrial complexes operative in the stream catchment. Overall, restoration measures indicated minor impact on fish assemblages and physical habitat due to slow and steady improvement, however, water quality improved due to a decline of nutrients and chemicals downstream. This indicated a positive tendency of improvements in physical habitat and richness of fish assemblages in Gap Stream.
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Kim, Soohong, Kichul Jung, and Hyeongsik Kang. "Response of Fish Community to Building Block Methodology Mimicking Natural Flow Regime Patterns in Nakdong River in South Korea." Sustainability 14, no. 6 (March 18, 2022): 3587. http://dx.doi.org/10.3390/su14063587.
Повний текст джерелаАнотація:
Water regulation and flood control of rivers are changing due to streamflow depletion following industrialization and urbanization, significantly impacting aquatic ecosystems. Therefore, restoration of the ecological environment is necessary to maintain a healthy river ecosystem. For ecosystem restoration, the amount of discharge from dams must be controlled and the appropriate environmental flow must be calculated according to the fish species. The change in the flow through the dam due to hydropeaking directly impacts the fish. This study aimed to construct a building block methodology (BBM) using dam inflows in the Gudam Bridge basin upstream of the Nakdong River, build a River2D model of this area, and calculate the natural flow regime and the weighted usable area (WUA). The analysis of the scenarios for the whole period (2006–2020) and by flow regime showed that WUA decreased in some periods, but improved overall in the scenario reflecting the BBM. For Zacco platypus, a dominant fish species of the Gudam Bridge, WUA decreased by ~11% in some periods (in September) but the habitat improvement effect measured up to 79%. Changing the dam discharge pattern by considering the flow regime seemed more effective in improving the habitat of fish living downstream.
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Munsch, Stuart H., Jeffery R. Cordell, and Jason D. Toft. "Effects of shoreline armouring and overwater structures on coastal and estuarine fish: opportunities for habitat improvement." Journal of Applied Ecology 54, no. 5 (April 24, 2017): 1373–84. http://dx.doi.org/10.1111/1365-2664.12906.
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Anita, Syahfitri, Haryono Haryono, and Gema Wahyudewantoro. "Fatty Acid Profile of Captive Barb Fish (Barbonymus balleroides)." BIO Web of Conferences 19 (2020): 00016. http://dx.doi.org/10.1051/bioconf/20201900016.
Повний текст джерелаАнотація:
Barbonymus balleroides or barb fish is a freshwater fish that threaten by overexploitation and overfishing in their natural habitat. Our continuous investigation showed that fat content of barb fish that has been maintained in our pond facility for more than 1 year was decreasing. Since fatty acid (FA) is important property for farmed fish therefore it is essential to evaluate fatty acid profile of flesh and byproduct of captive Barb Fish. Captive fishes were originated from two different locations, Serayu River, Banjarnegara and Cipunagara River, Cianjur. FA composition of flesh and byproduct of fishes were analyzed using Gas Chromatography. Result showed that both flesh and byproduct of both origin contained good quality of FA particularly omega 3 and omega 6 and other beneficial unsaturated fat, omega 9. However captive barb fish showed lower FA composition than wild barb fish that could be influenced by its feed and other environmental parameter. The high composition of FA in barb fish byproduct indicated its potency to be utilized further for nutrition source. This study showed the needed to make further improvement in barb fish cultivation so that it could produces high quality farmed fish.
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Taddese, Fasil, and Gerard P. Closs. "Spatiotemporal ichthyofaunal dynamics in a permanently open estuary, Otago, New Zealand." Marine and Freshwater Research 71, no. 1 (2020): 107. http://dx.doi.org/10.1071/mf19034.
Повний текст джерелаАнотація:
Understanding the spatial and temporal dynamics of the fish-assemblage structure of estuaries is indispensable in conservation and habitat-improvement efforts. This study reports seasonal as well as spatial dynamics of fish diversity of the Waikouaiti Estuary and indicates the key physicochemical variables that influence the ichthyofauna of the estuary. Fish were collected from upper, middle and lower reaches of the Waikouaiti Estuary monthly for 1 year, by using a seine net. In total, 15 species and 4967 individuals were collected during the study period. Distinct differences in ichthyofaunal composition, driven by spatiotemporal environmental heterogeneity, were observed between the three reaches of the Waikouaiti Estuary. Fish abundance was higher in the middle reach where the water is turbid. Whereas fish species with diadromous life history occurred more frequently in the upper reach of the estuary, marine-migrants and marine-stragglers were abundant in the lower reach. The present study indicated that salinity and turbidity were the best predictors of fish species composition in the different reaches of the Waikouaiti Estuary.
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Chritz, Kendra L., Fiona B. Marshall, M. Esperanza Zagal, Francis Kirera, and Thure E. Cerling. "Environments and trypanosomiasis risks for early herders in the later Holocene of the Lake Victoria basin, Kenya." Proceedings of the National Academy of Sciences 112, no. 12 (March 9, 2015): 3674–79. http://dx.doi.org/10.1073/pnas.1423953112.
Повний текст джерелаАнотація:
Specialized pastoralism developed ∼3 kya among Pastoral Neolithic Elmenteitan herders in eastern Africa. During this time, a mosaic of hunters and herders using diverse economic strategies flourished in southern Kenya. It has been argued that the risk for trypanosomiasis (sleeping sickness), carried by tsetse flies in bushy environments, had a significant influence on pastoral diversification and migration out of eastern Africa toward southern Africa ∼2 kya. Elmenteitan levels at Gogo Falls (ca. 1.9–1.6 kya) preserve a unique faunal record, including wild mammalian herbivores, domestic cattle and caprines, fish, and birds. It has been suggested that a bushy/woodland habitat that harbored tsetse fly constrained production of domestic herds and resulted in subsistence diversification. Stable isotope analysis of herbivore tooth enamel (n = 86) from this site reveals, instead, extensive C4 grazing by both domesticates and the majority of wild herbivores. Integrated with other ecological proxies (pollen and leaf wax biomarkers), these data imply an abundance of C4 grasses in the Lake Victoria basin at this time, and thus little risk for tsetse-related barriers to specialized pastoralism. These data provide empirical evidence for the existence of a grassy corridor through which small groups of herders could have passed to reach southern Africa.
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Pariselle, Antoine, Maarten Van Steenberge, Jos Snoeks, Filip A. M. Volckaert, Tine Huyse, and Maarten P. M. Vanhove. "Ancyrocephalidae (Monogenea) of Lake Tanganyika: Does the Cichlidogyrus parasite fauna of Interochromis loocki (Teleostei, Cichlidae) reflect its host’s phylogenetic affinities?" Contributions to Zoology 84, no. 1 (January 30, 2015): 25–38. http://dx.doi.org/10.1163/18759866-08401003.
Повний текст джерелаАнотація:
The faunal diversity of Lake Tanganyika, with its fish species flocks and its importance as a cradle and reservoir of ancient fish lineages seeding other radiations, has generated a considerable scientific interest in the fields of evolution and biodiversity. The Tropheini, an endemic Tanganyikan cichlid tribe, fills a peculiar phylogenetic position, being closely related to the haplochromine radiations of Lakes Malawi and Victoria. Several problems remain regarding their genus-level classification. For example, the monotypic genus Interochromis is phylogenetically nested within Petrochromis; its only representative, I. loocki, has often been reclassified. As monogenean flatworms are useful markers for fish phylogeny and taxonomy, the monogenean fauna of Interochromis loocki was examined and compared to that of other tropheine cichlids. Three new monogenean species belonging to Cichlidogyrus are described from Interochromis loocki: Cichlidogyrus buescheri Pariselle and Vanhove, sp. nov., Cichlidogyrus schreyenbrichardorum Pariselle and Vanhove, sp. nov. and Cichlidogyrus vealli Pariselle and Vanhove, sp. nov. Their haptoral anchors remind more of congeners infecting species of Petrochromis than of all Cichlidogyrus spp. hitherto described from other tropheine cichlids. Attachment organ morphology has been proven to mirror the phylogenetic affinities of Cichlidogyrus lineages. Therefore the monogenean parasite fauna of I. loocki reflects this host’s position within Petrochromis. Moreover, I. loocki differs in habitat choice from Petrochromis spp. This study hence confirms that host range and host-specificity in Cichlidogyrus spp. parasitizing tropheines is determined by the host’s phylogenetic position, rather than by a shared ecological niche.
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Zhou, Yanghao, Junyi Li, Hongfang Qi, Haile Yang, Xuan Ban, Jianxin Yang, and Hao Du. "Riverbed Substrate Requirements for Natural Reproduction of Gymnocypris przewalskii." Animals 11, no. 11 (November 13, 2021): 3246. http://dx.doi.org/10.3390/ani11113246.
Повний текст джерелаАнотація:
Gymnocypris przewalskii (i.e., Qinghai Lake naked carp) is a migratory fish species that lives in highland brackish water. It is important to understand the abiotic environment required by this fish to reproduce naturally so that its habitat can be protected and the wild population can be conserved. Here, artificial simulation and spawning ground substrate transformation experiments were conducted to examine the riverbed substrate requirements for G. przewalskii to naturally reproduce. Using various techniques (in vitro markers, videography, and Ethovision XT behavior tracking), this study systematically investigated the riverbed substrate preferences of G. przewalskii as well as the characteristics and effectiveness of natural reproduction induced by pebble riverbed substrate. The findings can be summarized as follows: (1) the habitat preferences of G. przewalskii differed significantly between various riverbed substrate, with pebble substrate being preferred during natural reproduction, and sand substrate being preferred pre- and post-spawning, and (2) the natural reproduction of G. przewalskii was heavily reliant on pebble riverbed substrate. Specifically, pebble substrate significantly improved spawn quantity and fertilization rate. These findings provide scientific evidence for the improvement and restoration of G. przewalskii spawning grounds, and insights regarding the artificial bionic reproduction of G. przewalskii.
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Konijnendijk, N., D. A. Joyce, H. D. J. Mrosso, M. Egas, and O. Seehausen. "Community Genetics Reveal Elevated Levels of Sympatric Gene Flow among Morphologically Similar but Not among Morphologically Dissimilar Species of Lake Victoria Cichlid Fish." International Journal of Evolutionary Biology 2011 (November 24, 2011): 1–12. http://dx.doi.org/10.4061/2011/616320.
Повний текст джерелаАнотація:
We examined genetic structure among five species of Lake Victoria haplochromine cichlids in four island communities, using a full factorial sampling design that compared genetic differentiation between pairs of species and populations of varying morphological similarity and geographical proximity. We found that allopatric conspecific populations were on average significantly more strongly differentiated than sympatric heterospecific populations of morphologically similar species. Allopatric heterospecific populations of morphologically dissimilar species were most differentiated. Our work demonstrates that phenotypic divergence can be maintained and perhaps even evolve in sympatry despite considerable gene flow between species. Conversely, phenotypic resemblance among conspecific populations can be maintained despite geographical isolation. Additionally we show that anthropogenically increased hybridization does not affect all sympatric species evenly but predominantly affects morphologically similar and closely related species. This has important implications for the evolution of reproductive isolation between species These findings are also consistent with the hypothesis of speciation reversal due to weakening of divergent selection and reproductive isolation as a consequence of habitat homogenization and offers an evolutionary mechanistic explanation for the observation that species poor assemblages in turbid areas of the lake are characterized by just one or two species in each of a few morphologically distinct genera.
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Newton, GM. "Estuarine Ichthyoplankton Ecology in Relation to Hydrology and Zooplankton Dynamics in salt-wedge Estuary." Marine and Freshwater Research 47, no. 2 (1996): 99. http://dx.doi.org/10.1071/mf9960099.
Повний текст джерелаАнотація:
The ichthyoplankton assemblage of the Hopkins River estuary, Victoria, was dominated by estuarine taxa that included demersal (goby, gudgeon) and pelagic (black bream, estuary perch, anchovy) species. The two seasonal peaks in fish larvae abundance were related to (1) the spring/summer zooplankton increase that occurred after flooding of the estuary and was comprised predominantly of copepod nauplii, thereby providing a good prey field for very young fish larvae, and (2) the autumn zooplankton maxima, which would provide a wide selection of copepod stages and meroplankton and promote dietary partitioning and flexibility among older larval stages. The two peaks in fish larvae abundance occurred well before and well after the attainment of maximum water temperature in the estuary. Goby, gudgeon, estuary perch and anchovy larvae were in the plankton over an extended period coinciding with the more stable conditions of salt-wedge presence and maximum zooplankton densities. The spawning of black bream and anchovies in the estuary was clearly related to physical conditions, such as salinity and water temperature, and habitat-although spawning of both species also occurred at times of high concentrations of potential prey organisms for their larvae. Adults of all the above fish species appear to have evolved spawning strategies that are adapted to the average hydrological and biological conditions in the estuary that would lead to the enhanced survival of their larvae. With the exception of the black bream, it appears that a ubiquitous and prolonged rather than a synchronous and confined spawning strategy is more widely used by estuarine-spawning fishes in the Hopkins River estuary. This type of spawning strategy, combined with the generally high density of food available to fish larvae in estuaries, suggests that the match-mismatch hypothesis of Cushing may be less relevant in the estuarine than in the marine environment.
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Wahl, Christina M., Edward L. Mills, William N. McFarland, and Joseph S. DeGisi. "Ontogenetic Changes in Prey Selection and Visual Acuity of the Yellow Perch, Perca flavescens." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 4 (April 1, 1993): 743–49. http://dx.doi.org/10.1139/f93-085.
Повний текст джерелаАнотація:
Age-0 yellow perch, Perca flavescens, shift from pelagic to demersal waters of Oneida Lake, New York, between late June to mid-July, when they reach standard lengths of 24–31 mm. The timing of this habitat shift coincides with the size range over which yellow perch achieve a degree of visual resolution that nearly equals that of adult yellow perch, from 174 min of arc in newly hatched larvae to 9–12 min in adults. This visual improvement is reflected in the yellow perch's diet, which consists of an increasingly wider range of prey sizes and types. If twin cones are counted as functionally separate photoreceptors, there is a significant improvement of the calculated visual acuity in larval fish with lenses < 1 mm in diameter but not in older fish with larger lenses. During its rapid growth phase the most optimistic calculation of visual acuity in a young yellow perch is insufficient to explain the feeding success necessary at this time. We suggest therefore that young yellow perch spend more time in search of prey than their adult counterparts.
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Wöber, Wilfried, Manuel Curto, Papius Tibihika, Paul Meulenbroek, Esayas Alemayehu, Lars Mehnen, Harald Meimberg, and Peter Sykacek. "Identifying geographically differentiated features of Ethopian Nile tilapia (Oreochromis niloticus) morphology with machine learning." PLOS ONE 16, no. 4 (April 15, 2021): e0249593. http://dx.doi.org/10.1371/journal.pone.0249593.
Повний текст джерелаАнотація:
Visual characteristics are among the most important features for characterizing the phenotype of biological organisms. Color and geometric properties define population phenotype and allow assessing diversity and adaptation to environmental conditions. To analyze geometric properties classical morphometrics relies on biologically relevant landmarks which are manually assigned to digital images. Assigning landmarks is tedious and error prone. Predefined landmarks may in addition miss out on information which is not obvious to the human eye. The machine learning (ML) community has recently proposed new data analysis methods which by uncovering subtle features in images obtain excellent predictive accuracy. Scientific credibility demands however that results are interpretable and hence to mitigate the black-box nature of ML methods. To overcome the black-box nature of ML we apply complementary methods and investigate internal representations with saliency maps to reliably identify location specific characteristics in images of Nile tilapia populations. Analyzing fish images which were sampled from six Ethiopian lakes reveals that deep learning improves on a conventional morphometric analysis in predictive performance. A critical assessment of established saliency maps with a novel significance test reveals however that the improvement is aided by artifacts which have no biological interpretation. More interpretable results are obtained by a Bayesian approach which allows us to identify genuine Nile tilapia body features which differ in dependence of the animals habitat. We find that automatically inferred Nile tilapia body features corroborate and expand the results of a landmark based analysis that the anterior dorsum, the fish belly, the posterior dorsal region and the caudal fin show signs of adaptation to the fish habitat. We may thus conclude that Nile tilapia show habitat specific morphotypes and that a ML analysis allows inferring novel biological knowledge in a reproducible manner.
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Wijaya, Adi, Abu Bakar Sambah, Daduk Setyohadi, and Umi Zakiyah. "Model of Habitat Characteristics of Sardinella lemuru in the Bali Strait, Indonesia." Journal of Southwest Jiaotong University 56, no. 3 (June 30, 2021): 229–40. http://dx.doi.org/10.35741/issn.0258-2724.56.3.19.
Повний текст джерелаАнотація:
This article describes a new approach to the study of the environmental conditions that relate to the Sardinella lemuru habitat in the Bali Strait, through remote sensing data and fish catch data using the generalized additive model. Data that are acquired daily and then compiled into monthly data for sea surface temperature, sea surface chlorophyll-a concentration, photosynthetically available radiation, and sea surface depth (SSD) were used for the years 2008–2010. The objectives of the study are to describe the variability of the environmental conditions in the Bali Strait, to analyze a combination model of environmental factors in estimating the Sardinella lemuru habitat, and to map potential Sardinella lemuru fishing areas. We illustrate the proposed method by constructing seven generalized additive models with catches of Sardinella lemuru as a variable response and use sea surface temperature, sea surface chlorophyll-a concentration, photosynthetically available radiation, and SSD as covariant models for assessing the environmental characteristics of the abundance of Sardinella lemuru. Predicted values were validated using a linear model. Based on the three model parameters, habitat selection for Sardinella lemuru was significantly (P < 0.0001) influenced by photosynthetically available radiation (50–55 Einstein m-2 d-1), sea surface chlorophyll-a concentration (0.2–2.0 mgm-3), sea surface temperature (28.95–29.64 °C), and SSD (60–150 m). Catch predictions show a consistent trend toward environmental conditions and water depth. Our method allows for improvement with the validation of catch predictions that were observed and collected monthly, and the result was significant (P < 0.001, r2 = 0.816). Photosynthetically available radiation explains the highest deviation in continued generalized additive models; therefore, it was considered to be the best predictor of habitat, followed by sea surface chlorophyll-a concentration, sea surface temperature, and then SSD. New research results supplement several previous studies that relate to the analysis of environmental parameters in estimating the fish habitat and can be used in mapping the distribution of potential Sardinella lemuru fishing areas in spatial and temporal scales.
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Cortes, Rui, Andrés Peredo, Daniela Terêncio, Luís Sanches Fernandes, João Moura, Joaquim Jesus, Marco Magalhães, Pedro Ferreira, and Fernando Pacheco. "Undamming the Douro River Catchment: A Stepwise Approach for Prioritizing Dam Removal." Water 11, no. 4 (April 4, 2019): 693. http://dx.doi.org/10.3390/w11040693.
Повний текст джерелаАнотація:
Dams provide water supply, flood protection, and hydropower generation benefits, but also harm native species by altering the natural flow regime, and degrading the aquatic and riparian habitats. In the present study, which comprised the Douro River basin located in the North of Portugal, the cost-benefit assessment of dams was based upon a balance between the touristic benefits of a dammed Douro, and the ecological benefits of less fragmented Douro sub-catchments. Focused on four sub-catchments (Sabor, Tâmega, Côa and Corgo), a probabilistic stream connectivity model was developed and implemented to recommend priorities for dam removal, where this action could significantly improve the movement of potadromous fish species along the local streams. The proposed model accounts for fish movement across the dam or weir (permeability), which is a novel issue in connectivity models. However, before any final recommendation on the fate of a dam or weir, the connectivity results will be balanced with other important socio-economic interests. While implementing the connectivity model, an inventory of barriers (dams and weirs) was accomplished through an observation of satellite images. Besides identification and location of any obstacles, the inventory comprised the compilation of data on surrounding land use, reservoir water use, characteristics of the riparian gallery, and permeability conditions for fish, among others. All this information was stored in a geospatial dataset that also included geographical information on the sub-catchment drainage network. The linear (drainage network) and point (barriers) source data were processed in a computer program that provided or returned numbers for inter-barrier stream lengths (habitat), and the barrier permeability. These numbers were finally used in the same computer program to calculate a habitat connector index, and a link improvement index, used to prioritize dam removal based upon structural connectivity criteria. The results showed that habitat patch connectivity in the Sabor, Tâmega and Côa sub-catchments is not dramatically affected by the installed obstacles, because most link improvement values were generally low. For the opposite reason, in the Corgo sub-catchment, obstacles may constitute a relatively higher limitation to connectivity, and in this case the removal of eight obstacles could significantly improve this connectivity. Using the probabilistic model of structural connectivity, it was possible to elaborate a preliminary selection of dams/weirs that critically limit stream connectivity, and that will be the focus of field hydraulic characterization to precisely determine fish movement along the associated river stretches. Future work will also include the implementation of a multi-criteria decision support system for dam removal or mitigation of the critical structures, as well to define exclusion areas for additional obstacles.
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Tonkin, Zeb, Joanne Kearns, Justin O'Mahony, and John Mahoney. "Spatio-temporal spawning patterns of two riverine populations of the threatened Macquarie perch (Macquaria australasica)." Marine and Freshwater Research 67, no. 11 (2016): 1762. http://dx.doi.org/10.1071/mf15319.
Повний текст джерелаАнотація:
Understanding species-reproduction dynamics is vital for the management of riverine fish. Information on the spawning ecology of the endangered Australian Macquarie perch (Macquaria australasica) is based largely on data gathered from lacustrine populations, with uncertainty on the applicability such data has for managing riverine populations. The current study presents a first description of spawning patterns of two riverine populations of Macquarie perch in Victoria, Australia, using egg counts recorded across multiple sites and periods within the species core spawning window. Spawning intensity was highly variable between study sites, with 96 and 82% of eggs collected from a single site in the King Parrot Creek and Yarra River respectively. We also found a strong positive association between spawning and water temperature. Our results provide an important account of spatio-temporal spawning patterns of riverine Macquarie perch populations and lend some support for the transfer of information from lacustrine populations (as demonstrated by spawning habitat and temperature association). Although the spatial and temporal constraints of the present study must be considered, the results provide opportunity for further testing of the environmental effects, and management options aimed at enhancing spawning of this endangered species.
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Walker, Sherry L., Kathleen Hedley, and Edward Porter. "Pulp and Paper Environmental Effects Monitoring in Canada: An Overview." Water Quality Research Journal 37, no. 1 (February 1, 2002): 7–19. http://dx.doi.org/10.2166/wqrj.2002.003.
Повний текст джерелаАнотація:
Abstract Environmental effects monitoring (EEM) is a requirement for pulp and paper mills in Canada discharging effluent directly into receiving environments under the Pulp and Paper Effluent Regulations of the Fisheries Act. The objective of the EEM program is to assess effects on fish, fish habitat and the use of fisheries resources by humans, potentially affected by the deposit of mill effluent in aquatic receiving environments. The information provided by the monitoring program will contribute to assessing the adequacy of the regulations. Difficulties encountered in the first round of monitoring led to an extensive science review of key components and resulted in improvement to process, scientific defensibility of the monitoring data and site-specific flexibility of the EEM program. The second cycle of EEM was, overall, markedly more successful than Cycle 1. However, problems were still evident for fish surveys conducted in marine and estuarine environments. The adoption of improved alternative monitoring approaches (e.g., caged bivalves, mesocosms) should alleviate many of these problems. An overview of the EEM program, results to date, alternative monitoring approaches, and research priorities to fill data gaps are presented.
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Dettori, Ettore Emanuele, Alessandro Balestrieri, Víctor Manuel Zapata-Pérez, Daniel Bruno, Nuria Rubio-Saura, and Francisco Robledano-Aymerich. "Eurasian otter Lutra lutra distribution and habitat use in a Mediterranean catchment managed for the control of invasive giant reed Arundo donax." Knowledge & Management of Aquatic Ecosystems, no. 423 (2022): 26. http://dx.doi.org/10.1051/kmae/2022024.
Повний текст джерелаАнотація:
We assessed the distribution and habitat use of Eurasian otter Lutra lutra on the middle course of the River Segura and its tributaries (Murcia, SE Spain) within the framework of the project LIFE13BIO/ES/001407 RIPISILVANATURA (2014–2019). Between April 2016 and June 2018, we surveyed for otter spraints 42 sampling stretches (mean length ± SD = 0.5 ± 0.2 km), covering a 109.8 km long section of the river. The study time frame coincided with the main restoration activities of the LIFE project, consisting in the eradication of widespread, invasive alien giant reed Arundo donax and plantation of autochthonous riparian vegetation. Otter habitat preferences were assessed by measuring ten environmental parameters potentially affecting its occurrence. The relationship between the presence/absence of the otter and habitat variables was evaluated by both linear multiple regression and non-parametric random forest regression model. Otters preferred river stretches crossing forested areas, avoided polluted waters and their occurrence was inversely related to the width of the emerged aquatic vegetation, mostly consisting of Arundo reed beds. Moreover, in managed stretches, otter marking intensity increased after the removal of alien reeds and was higher in RIPISILVANATURA restored transects (1.18 spraints/100 m) than in the downstream, unmanaged half of the watercourse (0.76 spraints/100 m). The combined effects of water pollution and giant reed spread may alter fish distribution and abundance, reducing prey availability to otters. The improvement of chemical and physical habitat quality of streams through alien reeds removal seems thus pivotal to enhance the recovery of otter's populations in the south-eastern Iberian Peninsula.
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Shkura, Viktor Nikolaevich, and Alexey Viktorovich Shevchenko. "Coastal complex for growing fish planting material for stocking high-eftrophic reservoirs (on the example of the Veselovsky reservoir on the Western Manych River)." Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), no. 7 (July 1, 2021): 68–79. http://dx.doi.org/10.33920/sel-09-2107-05.
Повний текст джерелаАнотація:
The purpose of the study is to substantiate the creation and use of drivedriven fish-breeding and reclamation complexes that provide fish-breeding development and biological reclamation of eutrophic water bodies (reservoirs and lakes). The need to create drive-storage fish-breeding and reclamation complexes is determined by the need to involve eutrophied inland water bodies in the fisheries turnover and conduct environmental improvement. One of the typical arid natural-climatic zones is the Veselovsky reservoir on the Western Manych River, the survey of which established the need to clean it from excess vegetation. The measures carried out on the reservoir for the introduction of herbivorous fish do not give results and do not lead to the expected reclamation effect. The main disadvantages of the applied technologies of fish-breeding activities at the reservoir are the use of fish-planting material that is not adapted to the conditions of the stocked water body, as well as a number of technological disadvantages of various processes. To eliminate them, it is proposed to organize the Veselovsky fish-breeding and reclamation complex, which includes a fish hatchery located directly next to it, providing the cultivation of fish-planting material adapted to the conditions of the stocked reservoir using non-contact technology of cultivation and stocking with technical means, and carrying out acclimatization measures. The structure of the fish hatchery provides for the construction of a cascade of outgrowth pools with regulated conditions of the aquatic environment and food regime. The different-height arrangement of fish-breeding pools on the slope section allows for non-contact intra-complex movement of fish and the release of fish-planting material into the acclimatization bay of the stocked reservoir. The maintenance system provides for the gradual rearing of young fish in fish-breeding pools with the most close to the conditions of the stocked reservoir physical and chemical conditions of the habitat and a different ratio in the diet of hydrobionts of artificial and natural food.
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Li, Pushuang, Dan Li, Xiaoqing Sun, Zhaosheng Chu, Ting Xia, and Binghui Zheng. "Application of Ecological Restoration Technologies for the Improvement of Biodiversity and Ecosystem in the River." Water 14, no. 9 (April 27, 2022): 1402. http://dx.doi.org/10.3390/w14091402.
Повний текст джерелаАнотація:
With global warming, urbanization, and the intensification of human activities, great pressures on river ecosystems have caused ecosystem degradation, the decline in habitats and biodiversity, and the loss of function. Ecological restoration technologies (ERTs) in rivers are effective measures for improving habitat and biodiversity, which has the advantage of recovering ecosystems and biodiversity and promoting the formation of healthy rivers. Several applications of ERTs, including ecological water transfer, fish passage construction, dam removal/retrofit, channel reconfiguration, river geomorphological restoration, natural shoreline restoration, floodplain reconnection, revegetation, etc., are summarized. The classifications of ERTs are highlighted, aiming to distinguish the difference and relationship between structure and the processes of hydrology, physics, geography, and biology. The pros and cons of these technologies are discussed to identify the applicability and limitations on the river ecosystem. In the dynamic processes in the river, these interact with each other to keep ecosystem balance. ERTs are more helpful in promoting the restoration of the natural function of the river, which contribute to the management of river ecological health. Some proposals on river management are suggested. Establishing a unified river health evaluation system will help promote positive feedback on rivers and the further development of ERTs.
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Romanov, A. Yu, N. M. Arshanitsa, A. A. Stekolnikov, and M. R. Grebtsov. "Ecological and toxicological state of the volkhov bay of ladoga lake." International bulletin of Veterinary Medicine, no. 4 (December 30, 2021): 103–8. http://dx.doi.org/10.52419/issn2072-2419.2021.4.103.
Повний текст джерелаАнотація:
The article deals with the issue of the ecological and toxicological state of the Volkhov Bay of Ladoga Lake — one of the most polluted water areas of the reservoir, which is of important fisheries importance and has a significant impact on the water quality of the Neva River in winter. Biological and chemical-analytical studies conducted in the summer of this year showed mass lesions of fish with chronic toxicosis. The study of water and bottom sediments did not reveal pronounced deposits from the norm, which is associated with the hydrological features of this water area — the nature of bottom sediments and the presence of currents, which contributes to the removal of pollutants outside the lip into the lake. Fish turned out to be the most informative indicators of the quality of their habitat. The study of various fish species caught in these waters showed that their toxicosis, regardless of the type, is of a massive nature, proceeds chronically, mainly with mild and moderate injuries in the gill tissue and parenchymal organs. It is shown that the lesion of fish is associated with and more pronounced in the water areas gravitating to the sources of pollution — the mouth of the river Volkhov and the stock of the Syasky Central Bank. Assessing the ecological and toxicological state of the Volkhov Bay at the present time in comparison with the results of past studies, some improvement should be noted.
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Fefelov, Viktor Vladimirovich, Nailya Baimuratovna Bulavina, Saule Zhangirovna Asylbekova, Artur Nasibullayevich Tumenov, and Azis Vasilyevich Shutkarayev. "Reconnaissance of Lake Simaki in North-Kazakhstan region for organizing lake commercial fish farm." Vestnik of Astrakhan State Technical University. Series: Fishing industry 2022, no. 1 (March 31, 2022): 54–64. http://dx.doi.org/10.24143/2073-5529-2022-1-54-64.
Повний текст джерелаАнотація:
Fishery is a traditional industry for North-Kazakhstan region and, therefore, restoration and organization of lake aquaculture enterprises will provide a significant rise in the economy of the region and creation of new jobs. Scale of the lake commercial fish farm development as a component of commercial fish farming, improvement of its contribution into delivery of food supplies to population depend first of all on the degree of its massive involvement. Status of Lake Peschanoye (Simaki) allows utilizing it for fish commercial cultivation. Application of science-based systems in organiz-ing the lake commercial fish farm will raise efficiency of using natural biopotential of this reservoir and correspondingly enlarge the volumes of production and quality of fish products. In 2021, the researches were conducted on Lake Peschanoye (Simaki). During the researches the hydrological regime of the lake was studied; the samples were taken and processed for hydrochemical and hydrobiological analysis; the material was collected to estimate the condition of ichtyofauna. Generally, the hydrological regime of Lake Peschanoye (Simaki) is found favorable for fish habitat. According to the research results of the year 2021, Lake Peschanoye (Simaki) is a freshwater reservoir with a total mineralization of 875.5 mg/dm3 which allows using it for obtaining commercial fish roe that will provide a greater economic effect from the lake’s utilization. According to the average value of the zoobenthos biomass, Lake Peschanoye (Simaki) belongs to a β-mesotrophic water reservoir which corresponds to the medium level of trophicity. According to the development of food reserves, the recommended volumes of stocking with commercial species are the following: northern whitefish (planktophage) – 4 500 larvae per ha (average value for the Northern Kazakhstan) and carp (benthophage) - 350 yearlings per ha. Pike stocking is recommended as an additional rearing target that will also act as a bio-ameliorator in the fight against the Amur sleeper.
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Schulte-Wülwer-Leidig, A. "Outline of the Ecological Master Plan for the Rhine." Water Science and Technology 29, no. 3 (February 1, 1994): 273–80. http://dx.doi.org/10.2166/wst.1994.0119.
Повний текст джерелаАнотація:
The “Ecological Master Plan for the Rhine (Salmon 2000)” was elaborated within the framework of the “Rhine” Action Programme (RAP). It focuses on two points.Restoration of the main stream as the backbone of the ecosystem Migratory fish can only return to the Rhine when certain conditions are given. Improvement measures must be realized. For the support and realization of the project “Salmon 2000” two applications for subsidies were approved by the European Community. The first project concerns various habitat improvements, re-establishing, re-stocking and success control measures in several Rhine tributaries. The second project concerns the methods of improvements at barrages which are currently considerable obstacles to migration. At the barrages of Iffezheim and Gambsheim/Upper Rhine, new fish ladders must be built. The Master Plan will only prove successful if the re-establishing and restocking of habitats is being carried out simultaneously with measures aiming at reestablishing the surmountability of barrage weirs.Preservation, protection and improvement of ecologically important reaches. The plan demands an extension of the alluvial areas. Complete ecological interaction between these areas and the river must be allowed. A group is working on a specific ecological network with the most important alluvial areas along the Rhine. These areas shall serve as “stepping stones” for the whole Rhine ecosystem. This plan may be considered as an exemplary conception of international waterways protection. Its significance includes amongst other things the applicability to other similar river systems.
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Tanaka, Kisei R., Jie Cao, Burton V. Shank, Samuel B. Truesdell, Mackenzie D. Mazur, Luoliang Xu, and Yong Chen. "A model-based approach to incorporate environmental variability into assessment of a commercial fishery: a case study with the American lobster fishery in the Gulf of Maine and Georges Bank." ICES Journal of Marine Science 76, no. 4 (February 22, 2019): 884–96. http://dx.doi.org/10.1093/icesjms/fsz024.
Повний текст джерелаАнотація:
Abstract Changes in bottom-up forcing are fundamental drivers of fish population dynamics. Recent literature has highlighted the need to incorporate the role of dynamic environmental conditions in stock assessments as a key step towards adaptive fishery management. Combining a bioclimate envelope model and a population dynamic model, we propose a model-based approach that can incorporate ecosystem products into single-species stock assessments. The framework was applied to a commercially important American lobster (Homarus americanus) stock in the Northwest Atlantic. The bioclimate envelope model was used to hindcast temporal variability in a lobster recruitment habitat suitability index (HSI) using bottom temperature and salinity. The climate-driven HSI was used to inform the lobster recruitment dynamics within the size-structured population dynamics model. The performance of the assessment model with an environment-explicit recruitment function is evaluated by comparing relevant assessment outputs such as recruitment, annual fishing mortality, and magnitude of retrospective biases. The environmentally-informed assessment model estimated (i) higher recruitment and lower fishing mortality and (ii) reduced retrospective patterns. This analysis indicates that climate-driven changes in lobster habitat suitability contributed to increased lobster recruitment and present potential improvement to population assessment. Our approach is extendable to other stocks that are impacted by similar environmental variability.
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SK, Zamsuddin. "Deterioration of Fisheries and Improvement Procedure of Fisheries: the Improvement Procedure of Inland and Marine Fisheries throughout the World." International Journal of Agriculture and Animal Production, no. 26 (November 22, 2022): 28–34. http://dx.doi.org/10.55529/ijaap.26.28.34.
Повний текст джерелаАнотація:
Fisheries are an extremely precious resource in the world. It is delicious food which more than people eat it and elsewhere, it is utilized as raw material for agro-industry and purpose of medicine. During the ancient and medieval era, marine and inland water were exceedingly productive for fisheries and numerous & miscellaneous types of fishes were spontaneously and naturally grown in marine water and inland water. During the ancient and medieval period, fishes were considered unlimited since the productive rate of water for fishes were exceedingly furious and all of the favourable features for grown fishes were excellently appearing in marine and inland water. Else, marine and terrestrial ecosystems were enriched, consequently massive fishes were supplied with sufficient food such as floating vegetation, insects, zooplankton and a lot of animal dead bodies which were supplied as food for massive fishes. Notwithstanding, after the Industrial revolution, the marine water and inland water were polluted and primary producers were massively destroyed. Consequently, the earlier feature of water was rapidly lost and numerous fishes were dead predominantly lacking sufficient oxygen, food and floating plant. Moreover, the cultivators utilized huge amounts of chemical fertilizers, insecticides and poison which merged in canal, ponds, river and ultimately into sea. Consequently, it changed the chemical and physical features of water which greatly reduced the productivity of water. Procedure of Fish Production: If we can return earlier productivity or feature of water, then again can increase huge production of fishes. Several produce steps are given below which many times increase fish production, if we appropriately follow it. Step 1: Pollution of water is a major problem which reduces fish productivity. Ordinarily, vegetation (floating plant on surface water and the bank & embankment covered by vegetation) can absorb huge poisonous elements and liquid. Huge surrounding plants and moderate or few floating plants absorb the pollution and poisonous elements from the water. The poisonous solid, liquids and gaseous elements can possibly be absorbed only by floating plants and surrounding vegetation. Ordinarily, the bank and embankment need to be covered by moderate dense vegetation. Since the covering vegetation decreases adjacent temperature since the sun rays can't directly fall into water which reduces temperature in water. Although, sun rays are precious and fundamental elements for growing massive fishes. Notwithstanding, intensive and massive sun rays are harmful for fishes since they increase the temperature of the surface water and consequently may change physical features of surface water due to exceeding temperature. Else, leaves of covering vegetation fall on water which increase acidity in water and help to absorb the poisonous elements from the water. Although, more acidity or more alkaline in water is detrimental for the growth of fishes. Step 2: Huge leaves of plants and floating plants increase the acidity in water. Ordinarily, fishes can't tolerate more acidity and it distorts the growth of fishes. Henceforward, infrequently we need applied pure calcium/ lime or calcareous which reduce the acidity of water. Furthermore, the calcium or lime/quicklime chemically reacts with clays and decomposed leaves which results produce a mixture of food for fishes. Henceforth, we need to apply five to seven times lime or quicklime in ponds and tanks since it chemically reacts with decomposed leaves, flowers and roots. Consequently, it creates food for fishes and it reduces the acidity in water. Step 3: For suitable habitats of fishes need 2 to 5 feet clays in ponds, lake, river or sea. The clays less than 2 feet or more than 5 feet clays are harmful for fishes. The sufficient clay (2 feet to 5 feet) creates suitable habitats for fishes. Although, the larger fishes need more clay and it depends on size of fishes. The sandy or silty bottom is mischievous for the growth of fishes and other aquatic life. Micro aquatic life can't grow massively in the silty and sandy bottom of water which is considered the main food for fishes. Step 4: The sunrays are considered extremely precious elements for the growth of massive fishes. Although, huge run ray’s is harmful for fishes and it can change the physical features of water. To mention that the catfish, shark catfish etc does not require adequate sunrays. These types of fishes can grow with less oxygen and sunrays. Furthermore, these types of fishes (catfish etc) grow in dirty clay and silty decomposed water. Step 5: Fish like habitats as branches of bamboo or plants which live on branches of bamboo and fragment of plants. It is considered a suitable habitat for fishes since it can't live long in the bottom. Else, the fish floats in the upper layer of water predominantly demanding of oxygen and sun rays. Step 6: For massive fishes to grow up in water, they need a supply of food such as a mixing of carbohydrate (food grain) and protein (rejected animal parts). These fishes grow up rapidly in a short time with a predominantly supply of sufficient foods. Step 7: Infrequently, the water of ponds or tanks need changes after a few years. They need pure water from the underground which keeps balance between quality of water and oxygen. Step 8: The pond and tanks need to be encircled by the embankment since the polluted and poisonous water can't merge with pond's water & tank water from the cultivation land. Henceforward, it needs obstacles contraire to polluted water and poisonous water. Step 9: The temperature is a great factor to keep the quality or productivity of water. The more temperature above 30 degrees Celsius is harmful for fishes and it changes the physical properties of water. Otherwise, less temperature (less than 5 degree Celsius) is harmful for fishes and sun rays & oxygen can't get reach in water. Ordinarily, 7 degrees to 17degrees Celsius temperatures are suitable for fishes and other aquatic life. Step 10: For cultivation of fishes in ponds or tanks use underground water since the underground water is pollution free and it is extremely clean which is perfect for fish cultivation. Step 11: The more alkaline water is not suitable for fishes. The decomposed leaves of plants reduce alkaline in water and it increases the acidity in water. Although, more acidity is not suitable for cultivation or growth of fishes. Henceforward, moderate alkaline and moderate acidity is suitable for fish cultivation. Step 12: The uncovered surface or partially uncovered surface of water is suitable for fishes. The covering by floating plants generates a barrier for the infiltration of atmospheric water and sun rays which is an extremely precious element for the growth of fishes. If these processes or procedures are appropriately followed then many times increase production of fish cultivation. Although, all types of fish don't need a similar environment.