Articoli di riviste: "Native fish"

1

Williams, Jack E., Richard N. Williams, Russell F. Thurow, Leah Elwell, David P. Philipp, Fred A. Harris, Jeffrey L. Kershner et al. "Native Fish Conservation Areas: A Vision for Large-Scale Conservation of Native Fish Communities". Fisheries 36, n. 6 (15 giugno 2011): 267–77. http://dx.doi.org/10.1080/03632415.2011.582398.

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2

Hesthagen, T., O. Hegge, J. Skurdal e B. K. Dervo. "Differences in habitat utilization among native, native stocked, and non-native stocked brown trout (Salmo trutta) in a hydroelectric reservoir". Canadian Journal of Fisheries and Aquatic Sciences 52, n. 10 (1 ottobre 1995): 2159–67. http://dx.doi.org/10.1139/f95-808.

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Native and native-stocked brown trout (Salmo trutta) in Lake Tesse, a regulated hydroelectric reservoir (southern Norway), were spatially segregated according to size: small individuals occurred mainly in the epibenthic habitat and larger individuals mainly in the pelagic habitat. In contrast, all size groups of non-native stocked brown trout were mostly restricted to the epibenthic habitat. Age-specific lengths were generally larger for non-native than for native stocked trout, which were larger than native fish. However, growth rate between age 3 and 4 was significantly lower for non-native stocked fish than for native and native stocked fish. Differences in body length were mainly due to strain but also to some extent to habitat. Native fish had significantly fuller stomachs in the pelagic than in the epibenthic habitat in summer. Epibenthic non-native fish had significantly fuller stomachs than native and native stocked fish in August but not in July. Native and native stocked fish fed mainly on surface insects and planktonic crustaceans in both habitats. We hypothesize that the non-native brown trout stocked in Lake Tesse do not use the pelagic habitat in the home lake and are therefore less adapted to utilize such habitat than populations originating from lakes where pelagic habitat is available.

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Paterson, Rachel A., Colin R. Townsend, Robert Poulin e Daniel M. Tompkins. "Introduced brown trout alter native acanthocephalan infections in native fish". Journal of Animal Ecology 80, n. 5 (22 marzo 2011): 990–98. http://dx.doi.org/10.1111/j.1365-2656.2011.01834.x.

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4

Hulme, P. E. "Rough waters for native Chinese fish". Science 347, n. 6221 (29 gennaio 2015): 484. http://dx.doi.org/10.1126/science.347.6221.484-a.

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5

DOVE, A. D. M. "Richness patterns in the parasite communities of exotic poeciliid fishes". Parasitology 120, n. 6 (giugno 2000): 609–23. http://dx.doi.org/10.1017/s0031182099005958.

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Three species of poeciliids (Gambusia holbrooki, Xiphophorus helleri and X. maculatus) and 15 species of ecologically similar native freshwater fishes (mainly eleotrids, ambassids, melanotaeniids and retropinnids) were examined for parasite richness to investigate parasite flux, qualitative differences, quantitative differences and the structuring factors in parasite communities in the 2 fish types in Queensland, Australia. Theory suggests that poeciliids would harbour depauperate parasite communities. Results supported this hypothesis; poeciliids harboured more species-poor parasite infracommunities and regional faunas than natives (P < 0·0001), despite greater sampling effort for the former. Cluster analysis of presence/absence data for poeciliids and the 6 most-sampled native fishes revealed that parasite communities of the 2 fish groups are qualitatively distinct; the proportion of parasite species with complex life-cycles was lower in poeciliids than in native species, and Myxosporea, Microspora, Coccidia and parasitic Crustacea were all absent from poeciliids. Limited exchange of parasite species has occurred between natives and poeciliids. Logistic ordinal regression analysis revealed that fish origin (exotic or native), environmental disturbance and host sex were all significant determinants of parasite community richness (P < 0·05). Theoretical modelling suggests that poeciliids are at a competitive advantage over native fishes because of their lack of parasites.

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Manangkalangi, Emmanuel, M. Fadjar Rahardjo, Renny K. Hadiaty, Sigid Hariyadi e Charles P. H. Simanjuntak. "Ekologi trofik komunitas ikan di Sungai Nimbai: Interaksi kompetisi dan pemangsaan terhadap ikan pelangi arfak, Melanotaenia arfakensis Allen, 1990". Jurnal Iktiologi Indonesia 19, n. 3 (1 ottobre 2019): 449. http://dx.doi.org/10.32491/jii.v19i3.505.

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Information on trophic ecology can provide an understanding of the functional role of fish in an ecosystem, including endemic and native fish groups, as well as alien fish that are introduced through anthropogenic activities. The research on the trophic ecology of the fish community in the Nimbai Stream, Prafi River system, is intended to describe the interaction of competition and predation, especially towards endemic fish, Melanotaenia arfakensis. Fish samples were collected monthly from four habitat types, i.e., slow littoral, medium littoral, pool, and run from May 2016 to April 2017. A combination of an electric shocker and a hand net was used to collect fish samples. A total of 16 fish species were collected, consists of one endemic species, namely M. arfakensis, nine species of native fish, and six species of alien fish. The Arfak rainbowfish and three native fish species were categorized as insectivorous, four native fish species as herbivorous, and two other fishes as carnivorous. Three alien fish species also belong to insectivorous, two alien fish species as carnivorous, and one species as herbivorous. The niche breadth of fish communities ranges from 0.071 to 0.857. The trophic niche overlap between the Arfak rainbowfish and three native fish species and three alien fish species was recorded. The results of this study indicate a potential competition and predation interactions between Arfak rainbowfish and native fish as well as with alien fish species. Therefore, introducing alien fish into Prafi River system will disrupt Arfak rainbowfish population.

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7

Henkanaththegedara, Sujan M., e Craig A. Stockwell. "Intraguild predation may facilitate coexistence of native and non-native fish". Journal of Applied Ecology 51, n. 4 (13 giugno 2014): 1057–65. http://dx.doi.org/10.1111/1365-2664.12285.

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8

SIMONOVIC, P., A. TOŠIĆ, M. VASSILEV, A. APOSTOLOU, D. MRDAK, M. RISTOVSKA, V. KOSTOV et al. "Risk assessment of non-native fishes in the Balkans Region using FISK, the invasiveness screening tool for non-native freshwater fishes". Mediterranean Marine Science 14, n. 2 (21 giugno 2013): 369. http://dx.doi.org/10.12681/mms.337.

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A high level of freshwater fish endemism in the Balkans Region emphasizes the need for non-native species risk assessments to inform management and control measures, with pre-screening tools, such as the Fish Invasiveness Screening Kit (FISK) providing a useful first step. Applied to 43 non-native and translocated freshwater fishes in four Balkan countries, FISK reliably discriminated between invasive and non-invasive species, with a calibration threshold value of 9.5 distinguishing between species of medium and high risk sensu lato of becoming invasive. Twelve of the 43 species were assessed by scientists from two or more Balkan countries, and the remaining 31 species by a single assessor. Using the 9.5 threshold, three species were classed as low risk, 10 as medium risk, and 30 as high risk, with the latter category comprised of 26 moderately high risk, three high risk, and one very high risk species. Confidence levels in the assessments were relatively constant for all species, indicating concordance amongst assessors.

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9

Gu, Dang En, Fan Dong Yu, Yin Chang Hu, Jian Wei Wang, Meng Xu, Xi Dong Mu, Ye Xin Yang et al. "The Species Composition and Distribution Patterns of Non-Native Fishes in the Main Rivers of South China". Sustainability 12, n. 11 (3 giugno 2020): 4566. http://dx.doi.org/10.3390/su12114566.

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Non-native fish invasions are among the greatest threats to the sustainability of freshwater ecosystems worldwide. Tilapia and catfish are regularly cultured in South China which is similar to their climate in native areas and may also support their invasive potential. We systematically collected fish from eight main rivers of South China, from 2016 to 2018, to investigate and analyse species’ composition and the distribution of non-native fishes. The data reveal that non-native fishes are widespread and abundant in the sampled rivers: of the 98,887 fish collected, 11,832 individuals representing 20 species were not native, which were distributed in the 96% sampled sites. Of the non-native fish species, 17 are used in aquaculture and 19 are native to the tropics; 13 are omnivores while the other seven are predators. Based on dissimilarity of the non-native fish species distributions across the eight rivers, the different rivers could be divided into four assemblages. Geographical isolation and temperature were identified as affecting the distribution patterns of non-native fishes, thereby influencing fish species composition, species number, dominant species, and distribution variations in the South China rivers. Species composition of the non-native fishes in these rivers are related to their introduction vector, compatibility with their native habitat, and feeding strategies. Their distribution was mainly influenced by geographical location and temperature. To mitigate the impacts of non-native fish, a series of stricter management practices, systematic monitoring, and more research are needed.

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10

Spikmans, Frank, Pim Lemmers, Huub J. M. op den Camp, Emiel van Haren, Florian Kappen, Anko Blaakmeer, Gerard van der Velde, Frank van Langevelde, Rob S. E. W. Leuven e Theo A. van Alen. "Impact of the invasive alien topmouth gudgeon (Pseudorasbora parva) and its associated parasite Sphaerothecum destruens on native fish species". Biological Invasions 22, n. 2 (12 novembre 2019): 587–601. http://dx.doi.org/10.1007/s10530-019-02114-6.

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Abstract The Asian cyprinid Pseudorasbora parva is considered to be a major threat to native fish communities and listed as an invasive alien species of European Union concern. Our study aims to gain evidence-based knowledge on the impact of both P. parva and its parasite Sphaerothecum destruens on native fish populations by analysing fish assemblages and body condition of individuals of native fish species in floodplain water bodies that were invaded and uninvaded by P. parva. We explored the use of environmental DNA (eDNA) techniques to detect S. destruens. Prevalence of S. destruens in native fish species was assessed. Fish samplings showed significantly negative correlations between the abundance of P. parva and the native Leucaspius delineatus, and Pungitius pungitius and three biodiversity indices of the fish assemblages (Simpson’s diversity index, Shannon–Wiener index and evenness). Contrastingly, the abundances of the native Gasterosteus aculeatus and P. parva were positively related. In nearly all isolated water bodies with P. parva, this species is outnumbering native fish species. No effect of P. parva presence was found on body condition of native fish species. Sphaerothecum destruens was demonstrated to occur in both P. parva and G. aculeatus. Gasterosteus aculeatus is suggested to be an asymptomatic carrier that can aid the further spread of S. destruens. Analysis of eDNA proved to be a promising method for early detection of S. destruens, here showing that S. destruens presence coincided with P. parva presence. The ongoing invasion of both P. parva and S. destruens is predicted to pose a significant risk to native fish communities.

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Lepak, Jesse M., Clifford E. Kraft e Brian C. Weidel. "Rapid food web recovery in response to removal of an introduced apex predator". Canadian Journal of Fisheries and Aquatic Sciences 63, n. 3 (1 marzo 2006): 569–75. http://dx.doi.org/10.1139/f05-248.

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Non-native species have increased extinction rates, decreased diversity, altered organism distributions, and constrained ecosystem functioning in native aquatic and terrestrial communities. Although widespread fish introductions have dramatically altered fish communities in north temperate lakes, restoration of native fish communities has been rarely accomplished. This study evaluated a native fish community restoration using a stable isotope based metric. Stable isotopes from a native apex predator (lake trout (Salvelinus namaycush)) were used to measure food web changes following removal of a dominant non-native apex predator (smallmouth bass (Micropterus dolomieu)). Prior to bass removal, lake trout consumed primarily invertebrates. Within 2 years of the initiation of an experimental removal effort, lake trout δ13C values (25.9 to 24.9) and trophic position (3.53.9) increased, reflecting a switch to prey fish consumption that was supported by stomach contents analyses. Here, we show the rapid reestablishment of food web linkages within a native fish community in response to changes in principal energy sources and trophic position of a native apex predator along with the ability to quantify the extent of these changes.

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12

Whitney, James E., Keith B. Gido e David L. Propst. "Factors associated with the success of native and nonnative species in an unfragmented arid-land riverscape". Canadian Journal of Fisheries and Aquatic Sciences 71, n. 8 (agosto 2014): 1134–45. http://dx.doi.org/10.1139/cjfas-2014-0153.

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Native fish persistence is threatened by the establishment and spread of nonnatives. Identifying environmental and biotic factors associated with the success of co-occurring native fishes and nonnative taxa is central to identifying mechanisms responsible for native declines and nonnative expansion. We related physicochemical variables, food resources, and community composition to the success (secondary production) of native and nonnative fishes, tadpoles, and crayfish across six sites in three reaches (tributary, canyon, and valley) during 2008–2011 in the Gila River, New Mexico. Native fish success was greater than nonnative success across a range of physicochemical conditions, basal resource supply rates, and nonnative communities, although nonnative fish, tadpole, and crayfish success could approach or exceed that of native fishes in canyon habitats, a warm-water tributary, or in downstream valley sites, respectively. Native fish success was lowest in canyon reaches, when flathead catfish (Pylodictis olivaris) and common carp (Cyprinus carpio) were highly productive. These results demonstrate the potential for native fish persistence in the presence of nonnatives in physically unmodified streams, highlighting the importance of habitat preservation for native conservation.

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13

Zhao, Kangshun, Chao Li, Tao Wang, Bowen Hu, Min Zhang e Jun Xu. "Distribution and Trophic Pattern of Non-Native Fish Species Across the Liao River Basin in China". Water 11, n. 6 (11 giugno 2019): 1217. http://dx.doi.org/10.3390/w11061217.

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Controlling the invasion of non-native fish species necessitates a complete understanding of the distribution of these species and the key factors that influence such distribution. In order to research the situation of non-native fish and the relevant influencing factors in the Liao River Basin, we investigated and analyzed the characteristics of the distribution and the trophic levels of non-native fish species, as well their response to different types of factors in the basin. Nine non-native fish species were found during the investigation, and the trophic levels of these species ranged between 2.00 and 3.84. The results of generalized linear models indicate that the distribution of non-native fish species in the basin is mainly related to anthropogenic activities, socioeconomic development, and climate. The southeastern part of the Liao River Basin is conducive to the distribution of non-native fish species. Furthermore, on a spatial scale, we also found that the mean trophic level of non-native fish species was not correlated with anthropogenic activities and socioeconomic development in the Liao River Basin. By providing evidence for the links between non-native fishes and different types of factors, our study contributes to increasing the relevant references for and experiences in the early detection and management of non-native fishes on a basin scale.

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Britton, J. R., Rodolphe E. Gozlan e Gordon H. Copp. "Managing non-native fish in the environment". Fish and Fisheries 12, n. 3 (11 novembre 2010): 256–74. http://dx.doi.org/10.1111/j.1467-2979.2010.00390.x.

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15

Xiong, Wen, Xiaoyun Sui, Shih-Hisung Liang e Yifeng Chen. "Non-native freshwater fish species in China". Reviews in Fish Biology and Fisheries 25, n. 4 (22 settembre 2015): 651–87. http://dx.doi.org/10.1007/s11160-015-9396-8.

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Stewart, David R., Annika W. Walters e Frank J. Rahel. "Landscape-scale determinants of native and non-native Great Plains fish distributions". Diversity and Distributions 22, n. 2 (15 ottobre 2015): 225–38. http://dx.doi.org/10.1111/ddi.12383.

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Gurung, Tek Bahadur. "Native fish conservation in Nepal: Challenges and opportunities". Nepalese Journal of Biosciences 2 (24 gennaio 2013): 71–79. http://dx.doi.org/10.3126/njbs.v2i0.7492.

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Habitat degradation and loss probably has been more responsible for the decline of native fish species. Nepalese fishes are one of main aquatic vertebrates which are yet to be studied for their occurrence, distribution and ecology, especially from western regions of the country. However, before complete understanding on native fishes, threat over their existence have been loomed by climate change, over fishing, pollution, alteration of natural habitats and poor understanding of fish ecology etc. Thus, publicizing the importance and knowledge of fish conservation has been one of the most important challenges. The other challenges are sustainability of quality and quantity of freshwaters which have been impacted. In such circumstance to overcome the problems, adoption of community or cooperative based conservation could be one of the best approaches for freshwaters and fish restoration. Optimistically, a national strategy on conservation of freshwater fish is desirable. Fish conservation has the opportunities to be used for multidimensional purposes. A success of single fish species might contribute substantially on local economy, if that could be used in aquaculture or angling for tourism industry. DOI: http://dx.doi.org/10.3126/njbs.v2i0.7492 Nepalese Journal of Biosciences 2 : 71-79 (2012)

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18

Casimiro, Armando César Rodrigues, Diego Azevedo Zoccal Garcia, Ana Paula Vidotto-Magnoni, John Robert Britton, Angelo Antonio Agostinho, Fernanda Simões De Almeida e Mario Luis Orsi. "Escapes of non-native fish from flooded aquaculture facilities: the case of Paranapanema River, southern Brazil". Zoologia 35 (23 maggio 2018): 1–6. http://dx.doi.org/10.3897/zoologia.35.e14638.

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Non-native species are a major driver of biodiversity loss. Aquaculture activities play a key role in introductions, including the escape of fishes from fish farm facilities. Here, the impact of flooding due to El Niño rains in 2015/2016 in the Lower and Middle Paranapanema River basin, southern Brazil, was investigated by evaluating fish escapes from 12 fish farms. The flooding resulted in the escape of approximately 1.14 million fishes into the river, encompassing 21 species and three hybrids. Non-native species were the most abundant escapees, especially Oreochromisniloticus (Linnaeus, 1758) and Coptodonrendalli (Boulenger, 1897) (96% of all fish). Only seven native fishes were in the escapee fauna, comprising 1% of all fish. Large floods, coupled with inadequate biosecurity, thus resulted in considerable inputs of non-native fish into this already invaded system.

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Leuven, R. S. E. W., A. J. Hendriks, M. A. J. Huijbregts, H. J. R. Lenders, J. Matthews e G. Van Der Velde. "Differences in sensitivity of native and exotic fish species to changes in river temperature". Current Zoology 57, n. 6 (1 dicembre 2011): 852–62. http://dx.doi.org/10.1093/czoolo/57.6.852.

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Abstract This paper describes the effects that temperature changes in the Rhine river distributaries have on native and exotic fish diversity. Site-specific potentially affected fractions (PAFs) of the regional fish species pool were derived using species sensitivity distributions (SSDs) for water temperature. The number of fish species in the river distributaries has changed remarkably over the last century. The number of native rheophilous species declined up until 1980 due to anthropogenic disturbances such as commercial fishing, river regulation, migration barriers, habitat deterioration and water pollution. In spite of progress in river rehabilitation, the native rheophilous fish fauna has only partially recovered thus far. The total number of species has strongly increased due to the appearance of more exotic species. After the opening of the Rhine-Main-Danube waterway in 1992, many fish species originating from the Ponto-Caspian area colonized the Rhine basin. The yearly minimum and maximum river temperatures at Lobith have increased by circa 4 0C over the period 1908-2010. Exotic species show lower PAFs than native species at both ends of the temperature range. The interspecific variation in the temperature tolerance of exotic fish species was found to be large. Using temporal trends in river temperature allowed past predictions of PAFs to demonstrate that the increase in maximum river temperature negatively affected a higher percentage of native fish species than exotic species. Our results support the hypothesis that alterations of the river Rhine’s temperature regime caused by thermal pollution and global warming limit the full recovery of native fish fauna and facilitate the establishment of exotic species which thereby increases competition between native and exotic species. Thermal refuges are important for the survival of native fish species under extreme summer or winter temperature conditions.

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Aksu, Sadi, Sercan Başkurt, Özgür Emiroğlu e Ali Serhan Tarkan. "Establishment and range expansion of non-native fish species facilitated by hot springs: the case study from the Upper Sakarya Basin (NW, Turkey)". Oceanological and Hydrobiological Studies 50, n. 3 (1 settembre 2021): 247–58. http://dx.doi.org/10.2478/oandhs-2021-0021.

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Abstract Non-native species can enter new habitats and ecosystems in a variety of ways. Suitable ecological conditions must exist for non-native species to reproduce in newly colonized habitats. Hot springs are suitable habitats for tropical, aquarium, and ornamental fish species. This paper presents the results of research on the distribution of non-native and native species in relation to environmental factors in the Upper Sakarya Basin, where several such springs are present. The fish fauna in the basin includes native (60% – 21 species, 14 of which are endemic) and non-native (40% – 14 species) fish species. Most of the non-native species (seven species) were found only in warm springs (minimum water temperature 16°C). In addition, 75 fish species belonging to 26 families were found throughout the Sakarya Basin. Hot springs were found to play an important role in the establishment of non-native species. The Kernel Density Estimation (KDE) results revealed that the non-native species density was high in the Upper Sakarya Basin where hot springs are common. This confirms that minimum and maximum temperatures are the main drivers of changes in the distribution of non-native fish species. Two aquarium fishes, Bujurguina vittata and Xiphophorus spp., are reported for the first time in the present study for inland waters of Turkey.

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Strecker, Angela L., e Julian D. Olden. "Fish species introductions provide novel insights into the patterns and drivers of phylogenetic structure in freshwaters". Proceedings of the Royal Society B: Biological Sciences 281, n. 1778 (7 marzo 2014): 20133003. http://dx.doi.org/10.1098/rspb.2013.3003.

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Despite long-standing interest of terrestrial ecologists, freshwater ecosystems are a fertile, yet unappreciated, testing ground for applying community phylogenetics to uncover mechanisms of species assembly. We quantify phylogenetic clustering and overdispersion of native and non-native fishes of a large river basin in the American Southwest to test for the mechanisms (environmental filtering versus competitive exclusion) and spatial scales influencing community structure. Contrary to expectations, non-native species were phylogenetically clustered and related to natural environmental conditions, whereas native species were not phylogenetically structured, likely reflecting human-related changes to the basin. The species that are most invasive (in terms of ecological impacts) tended to be the most phylogenetically divergent from natives across watersheds, but not within watersheds, supporting the hypothesis that Darwin's naturalization conundrum is driven by the spatial scale. Phylogenetic distinctiveness may facilitate non-native establishment at regional scales, but environmental filtering restricts local membership to closely related species with physiological tolerances for current environments. By contrast, native species may have been phylogenetically clustered in historical times, but species loss from contemporary populations by anthropogenic activities has likely shaped the phylogenetic signal. Our study implies that fundamental mechanisms of community assembly have changed, with fundamental consequences for the biogeography of both native and non-native species.

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Mueller, Gordon A. "Predatory Fish Removal and Native Fish Recovery in the Colorado River Mainstem". Fisheries 30, n. 9 (settembre 2005): 10–19. http://dx.doi.org/10.1577/1548-8446(2005)30[10:pfranf]2.0.co;2.

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KAYACI, ALİ, Mehmet Fatih CAN, Yusuf GÜNER, Fatih GÜLEÇ e Mehmet İKİZ. "Genetic Impact Determination of Farmed Fish on Native Fish by mtDNA Markers". Kahramanmaraş Sütçü İmam Üniversitesi Doğa Bilimleri Dergisi 18, n. 1 (2 novembre 2015): 18. http://dx.doi.org/10.18016/ksujns.44024.

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Hindar, Kjetil, Nils Ryman e Fred Utter. "Genetic Effects of Cultured Fish on Natural Fish Populations". Canadian Journal of Fisheries and Aquatic Sciences 48, n. 5 (1 maggio 1991): 945–57. http://dx.doi.org/10.1139/f91-111.

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This paper addresses the genetic consequences of aquaculture on natural fish populations. The study is motivated by rapidly increasing numbers of intentionally and accidentally released fish and is based on empirical observations reported in the literature. A wide variety of outcomes, ranging from no detectable effect to complete introgression or displacement, has been observed following releases of cultured fish into natural settings. Where genetic effects on performance traits have been documented, they always appear to be negative in comparison with the unaffected native populations. These findings are consistent with theoretical considerations of the implications of elevated levels of gene flow between cultured and locally adapted natural populations; they raise concerns over the genetic future of many natural populations in the light of increasing numbers of released fish. Strategies for the genetic protection of native populations from the effects of aquaculture are outlined including more secure containment, the use of sterilized fish, and modifying the points of rearing and release. We recommend strong restrictions on gene flow from cultured to wild populations and effective monitoring of such gene flow.

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Hedianto, Dimas Angga, e Agus Arifin Sentosa. "INTERAKSI TROFIK KOMUNITAS IKAN DI DANAU MATANO, SULAWESI SELATAN PASCA BERKEMBANGNYA IKAN ASING INVASIF". Jurnal Penelitian Perikanan Indonesia 25, n. 2 (10 giugno 2019): 117. http://dx.doi.org/10.15578/jppi.25.2.2019.117-133.

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Interaksi trofik pasca masuknya ikan introduksi ataupun ikan asing invasif merupakan dasar untuk mengkaji tekanan ekologis terhadap ikan asli. Penelitian ini bertujuan untuk menganalisis interaksi trofik komunitas ikan pasca berkembangnya jenis-jenis ikan asing invasif di Danau Matano, Sulawesi Selatan. Ikan contoh diperoleh dari hasil tangkapan jaring insang percobaan, jala lempar, dan seser pada Mei, Oktober, dan November 2015 serta Februari, Juli, dan September 2016. Analisis ekologi trofik yang dilakukan meliputi indeks bagian terbesar, tingkat trofik, luas relung dan tumpang tindih relung makanan, serta pola strategi makan. Hasil penelitian menunjukkan komunitas ikan yang tertangkap di Danau Matano terdiri atas 9 famili, 11 genera, dan 17 spesies. Ikan louhan mendominasi komunitas ikan di Danau Matano sebesar 53,62%. Makanan alami yang banyak dimanfaatkan oleh sejumlah ikan dalam komunitas adalah insekta (Diptera), Gastropoda (Tylomelania sp.), dan larva insekta (Chironomidae). Kelompok trofik komunitas ikan di Danau Matano terdiri atas detritivora, herbivora, insektivora, zoobentivora, dan piscivora. Masuknya ikan introduksi memunculkan kelompok trofik baru (detritivora dan herbivora). Ikan introduksi cenderung memiliki luas relung makanan yang lebih bervariasi. Kompetisi terhadap makanan alami kategori moderat banyak terjadi antara ikan asli dengan louhan. Strategi pola makan ikan asli di Danau Matano cenderung bersifat spesialis, sedangkan ikan introduksi memiliki strategi pola makan yang lebih bervariasi dan oportunistik. Ikan louhan sebagai ikan introduksi dominan yang bersifat invasif mampu memanfaatkan seluruh sumber daya makanan alami yang tersedia dan menempati tingkat trofik tertinggi di Danau Matano. Tekanan ekologi terhadap ikan asli oleh ikan asing invasif di Danau Matano terjadi karena adanya kompetisi terhadap makanan alami.Trophic interactions post-develpment of non-native fish or invasive alien fish species are the basis knowledge for assessing and preventing the ecological pressure on native fish. This research aims to analyze the trophic interactions of fish community post-development of invasive alien fish species in Lake Matano, South Sulawesi. Fish samples were obtained from the catch of experimental gill nets, cast nets, and push nets in May, October, and November 2015 along with February, July, and September 2016. Trophic ecological analysis carried out included index of preponderance, trophic level, niche breadth and niche overlap of natural food, and feeding strategy. The fish community caught in Lake Matano consists of 9 families, 11 genera, and 17 species. Flowerhorn cichlid dominates the fish community in Lake Matano by 53.62%. Natural foods that are widely used by a number of fish in the community are Insecta (Diptera), Gastropods (Tylomelania sp.), and larvae of Insecta (Chironomidae). The guild trophic of fish community in Lake Matano consists of detritivores, herbivores, insectivores, zoobentivores, and piscivores. The introduction of non-native species bring up to new guilds (detritivores and herbivores). Non-native fishes tends to have a variety niche breadth. Moderate competition for natural food resources between native fish and flowerhorn cichlid is quite high. Feeding strategy of native species in Lake Matano tend to be specialist, while non-natives species have more variety and opportunistic. Flowerhorn cichlid as dominant invasive alien fish species is able to utilize all natural food resources and occupies the highest trophic level in Lake Matano. Ecological pressure on native fish by invasive alien fish species in Lake Matano occurs due to competition in obtaining natural food resources.

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OHEE, HENDERITE L., PUGUH SUJARTA, SURIANI BR SURBAKTI e HOLLY BARCLAY. "Rapid expansion and biodiversity impacts of the red devil cichlid (Amphilophus labiatus, Günther 1864) in Lake Sentani, Papua, Indonesia". Biodiversitas Journal of Biological Diversity 19, n. 6 (9 ottobre 2018): 2096–103. http://dx.doi.org/10.13057/biodiv/d190615.

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Ohee HL, Sujarta P, Br Surbakti S, Barclay H. 2018. Rapid expansion and biodiversity impacts of the red devil cichlid (Amphilophus labiatus, Günther 1864) in Lake Sentani, Papua, Indonesia. Biodiversitas 19: 2096-2103. The red devil cichlid (Amphilophus labiatus, Günther 1864) is one of ten exotic fish species inhabiting Lake Sentani. It is believed to be one of the most important threats to the native fish of Lake Sentani. This study aimed to document the distribution of red devil cichlids and the impacts of this species on native fish fauna. Fish were sampled in six locations in Lake Sentani using gill nets during February and March 2018. Fish species and abundance were recorded and used to calculate the relative abundance, dominance, species evenness, Shannon Wiener Index (H’) and the correlation between introduced and native fish species. A total of 836 fish belonging to 12 species were recorded across Lake Sentani. Mean fish diversity (H’=0.57) and evenness (E= 0.25) were low. The red devil cichlid is the most abundant fish recorded during our surveys (87.2% of total fish collected) and is now the most dominant fish in the lake (C=0.76). Moreover, it has colonized all areas sampled within the lake because of its ability to colonize new habitat and to successfully exploit a large diversity of trophic niches. However, Amphilophus labiatus was not found to be significantly correlated to native fish between different sites in Lake Sentani. The existence of endemic and native fish in Lake Sentani is now seriously threatened by the presence of the red devil cichlid throughout this lake.

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Loures, Raquel Coelho, e Paulo Santos Pompeu. "Long-term study of reservoir cascade in south-eastern Brazil reveals spatio-temporal gradient in fish assemblages". Marine and Freshwater Research 69, n. 12 (2018): 1983. http://dx.doi.org/10.1071/mf18109.

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In reservoir cascades, effects on fish assemblages are expected to strengthen over time and transfer from one reservoir to an adjacent one. To test this, fish-assemblage data from 23 years of monitoring in the Araguari reservoir cascade system, upper Paraná River basin, were analysed. The results showed a clear reduction in richness of native and migratory fish species and an increase of non-native species, following reservoir formation. Migratory species richness was higher in reservoirs that presented habitats similar to lotic stretches or tributaries upstream of the impounded area. There was a clear tendency for native species to decline and non-native fish species to increase, in a downstream direction. Fish assemblages became increasingly dissimilar as reservoirs became more distant from each other (longitudinal gradient) and were dominated by small and medium-sized species. Alongside longitudinal position, reservoir area, age and the presence of herbivorous non-native fish were found to be important predictors of variation in fish-assemblage structure. Results from the present study help clarify the potential accumulated impacts of reservoir cascades on fish diversity, which must be carefully considered in river-basin inventories for hydropower plants, and reinforce the importance of long-term monitoring, considering longitudinal and lateral dimensions of the basin.

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Cicala, Davide, Gianluca Polgar, Jordi René Mor, Roberta Piscia, Stefano Brignone, Silvia Zaupa e Pietro Volta. "Trophic Niches, Trophic Positions, and Niche Overlaps between Non-Native and Native Fish Species in a Subalpine Lake". Water 12, n. 12 (10 dicembre 2020): 3475. http://dx.doi.org/10.3390/w12123475.

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In the last century, Italian freshwater ecosystems have been invaded by several non-native fish species. In the subalpine Lake Mergozzo (northern Italy), several recently introduced non-native species dramatically expanded their populations. We used carbon and nitrogen stable isotopes to describe the isotopic niches and trophic positions of native and non-native fish species in Lake Mergozzo. We evaluated their trophic niches, trophic diversity, trophic redundancy and trophic evenness utilizing isotopic niche metrics, and estimated asymmetrical niche overlaps. The trophic traits of non-native fish species and Perca fluviatilis clearly define them as trophic generalists, in terms of among-individual variability of their isotopic niches. The historical increase in abundance of fish non-native species in this lake, their dominance by numbers and biomass within the assemblage, and their broad asymmetrical niche overlaps suggest that their higher degree of trophic generalism might have been one of the key factors that have promoted the invasion of the recipient community.

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29

Kessel, N. Van, M. Dorenbosch, M. R. M. De Boer, R. S. E. W. Leuven e G. Van Der Velde. "Competition for shelter between four invasive gobiids and two native benthic fish species". Current Zoology 57, n. 6 (1 dicembre 2011): 844–51. http://dx.doi.org/10.1093/czoolo/57.6.844.

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Abstract Recent invasions by non-native gobiid fish species that are ongoing in the Western European rivers Rhine and Meuse, will lead to interactions with native benthic fish species. Since both non-native gobiids and native benthic species are bottom dwelling species with a preference for shelter during at least part of their life cycle, it is likely that competition for shelter will occur between these non-native and native species when shelter is a limiting factor. To investigate the importance of this mechanism for species replacements, various habitat choice experiments were conducted between two common native benthic fish species (Cottus perifretum and Barbatula barbatula) and four invasive non-native gobiid species (Proterorhinus semilunaris, Neogobius melanostomus, N. kessleri and N. fluviatilis). The first series of single specimen experiments determined the habitat choice of each individual fish species. In a second series of competition experiments, shifts in habitat choice in comparison with the previously observed habitat choice, were determined when a native benthic fish species co-occurred with non-native gobiid species. Native C. perifretum displayed a significant shift in habitat choice in co-occurrence with the gobiids N. kessleri or P. semilunaris. C. perifretum was outcompeted and moved from the available shelter place to less preferred habitat types. During the competition experiments no change in habitat choice of B. barbatula was shown. Our study therefore suggests that competition for shelter is likely to occur in rivers invaded by N. kessleri and P. semilunaris at sites where shelter is limiting.

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Grapci-Kotori, Linda, Theocharis Vavalidis, Dimitris Zogaris, Radek Šanda, Jasna Vukić, Donard Geci, Halil Ibrahimi, Astrit Bilalli e Stamatis Zogaris. "Fish distribution patterns in the White Drin (Drini i Bardhë) river, Kosovo". Knowledge & Management of Aquatic Ecosystems, n. 421 (2020): 29. http://dx.doi.org/10.1051/kmae/2020020.

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Fish assemblages and their distributions in the western Balkan rivers have rarely been investigated. This study provides initial insights into the spatial patterns of fish distributions in the main-stem of the White Drin in Kosovo. Sampling primarily utilized back-pack electrofishing at 11 sites along the river's entire main stem, recording 21 species. Identification of most fish species was confirmed through DNA barcode analyses; two yet unnamed species are present and some taxonomic problems were discovered. The abundance of non-native species was low (5.9% of the catch) but seven of the eight non-natives have established populations. A longitudinal fish zonation pattern was described for the first time in this river; fish assemblages in an upstream-to-downstream gradient were characterized by a decrease of cold-water species (salmonids, minnows) and an increase of large-river cyprinids and non-native species. Multivariate ordination and network analyses demarcate preliminary fish assemblage types and specific environmental and anthropogenic pressure attributes are shown to influence assemblage structure. Natural assemblage patterns may be locally disrupted by anthropogenic pressures such as pollution and hydromorphological disturbances, however most sites show semi-natural features and conditions. Recommendations for conservation and further research are provided.

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Irz, P., C. Argillier e J. P. Proteau. "Contribution of native and non-native species to fish communities in French reservoirs". Fisheries Management and Ecology 11, n. 3-4 (giugno 2004): 165–72. http://dx.doi.org/10.1111/j.1365-2400.2004.00396.x.

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Di Prinzio, Cecilia Yanina, e Ricardo Jorge Casaux. "Dietary overlap among native and non-native fish in Patagonian low-order streams". Annales de Limnologie - International Journal of Limnology 48, n. 1 (2012): 21–30. http://dx.doi.org/10.1051/limn/2011055.

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Paterson, Rachel A., Aparna Lal, Marcia Dale, Colin R. Townsend, Robert Poulin e Daniel M. Tompkins. "Relative competence of native and exotic fish hosts for two generalist native trematodes". International Journal for Parasitology: Parasites and Wildlife 2 (dicembre 2013): 136–43. http://dx.doi.org/10.1016/j.ijppaw.2013.03.004.

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Kopp, Dorothée, Jordi Figuerola, Arthur Compin, Frédéric Santoul e Régis Céréghino. "Local extinction and colonisation in native and exotic fish in relation to changes in land use". Marine and Freshwater Research 63, n. 2 (2012): 175. http://dx.doi.org/10.1071/mf11142.

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Distribution patterns of many native and exotic fish species are well documented, yet little is known about the temporal dynamics of native and exotic diversity in relation to changes in land use. We hypothesised that colonisation rates would be higher for exotic fish species and that extinction rates would be higher for native species in large stream systems. We also predicted that cold-water species would be more impacted than thermally tolerant species. To test these hypotheses, we used generalised linear mixed models to compare changes in native and exotic fish species richness over 10 years in a French drainage basin subjected to landscape alterations. Exotic fish were more susceptible to local extinction than the native ones. Extinction was greater among cold-tolerant species and at higher elevations. Colonisation by exotic species was higher at lower elevations. Although a decade of expanding urbanisation affected fish colonisation, agricultural lands experienced higher extinction rates. In the context of global changes in land use and population pressure, our study suggests that the temporal dynamics of fish diversity are driven by landscape alterations as well as by the thermal tolerance of species.

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Boussellaa, Wiem, Lassad Neifar, M. Anouk Goedknegt e David W. Thieltges. "Lessepsian migration and parasitism: richness, prevalence and intensity of parasites in the invasive fish Sphyraena chrysotaenia compared to its native congener Sphyraena sphyraena in Tunisian coastal waters". PeerJ 6 (14 settembre 2018): e5558. http://dx.doi.org/10.7717/peerj.5558.

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Background Parasites can play various roles in the invasion of non-native species, but these are still understudied in marine ecosystems. This also applies to invasions from the Red Sea to the Mediterranean Sea via the Suez Canal, the so-called Lessepsian migration. In this study, we investigated the role of parasites in the invasion of the Lessepsian migrant Sphyraena chrysotaenia in the Tunisian Mediterranean Sea. Methods We compared metazoan parasite richness, prevalence and intensity of S. chrysotaenia (Perciformes: Sphyraenidae) with infections in its native congener Sphyraena sphyraena by sampling these fish species at seven locations along the Tunisian coast. Additionally, we reviewed the literature to identify native and invasive parasite species recorded in these two hosts. Results Our results suggest the loss of at least two parasite species of the invasive fish. At the same time, the Lessepsian migrant has co-introduced three parasite species during the initial migration to the Mediterranean Sea, that are assumed to originate from the Red Sea of which only one parasite species has been reported during the spread to Tunisian waters. In addition, we found that the invasive fish has acquired six parasite species that are native in the Mediterranean Sea. However, parasite richness, prevalence and intensity were overall much lower in the invasive compared to the native fish host in the Mediterranean Sea. Discussion These results suggest that the Lessepsian migrant may affect native fish hosts by potentially altering the dynamics of native and invasive parasite-host interactions via parasite release, parasite co-introduction and parasite acquisition. They further suggest that the lower infection levels in the invasive fish may result in a competitive advantage over native fish hosts (enemy release hypothesis). This study demonstrates that cross-species comparisons of parasite infection levels are a valuable tool to identify the different roles of parasites in the course of Lessepsian migrations.

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Haslouer, Stephen G., Mark E. Eberle, David R. Edds, Keith B. Gido, Chris S. Mammoliti, James R. Triplett, Joseph T. Collins, Donald A. Distler, Donald G. Huggins e William J. Stark. "Current status of native fish species in Kansas". Transactions of the Kansas Academy of Science 108, n. 1 & 2 (gennaio 2005): 32–46. http://dx.doi.org/10.1660/0022-8443(2005)108[0032:csonfs]2.0.co;2.

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37

Harder, Ben. "Fierce Invader Steals Nests from a Native Fish". Science News 160, n. 11 (15 settembre 2001): 166. http://dx.doi.org/10.2307/4012592.

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38

Pino-del-Carpio, Andrea, Rafael Miranda e Jordi Puig. "Non-native freshwater fish management in Biosphere Reserves". Management of Biological Invasions 1, n. 1 (2010): 13–33. http://dx.doi.org/10.3391/mbi.2010.1.1.04.

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Lapointe, Nicolas W. R., e Theo Light. "Landscape-scale determinants of non-native fish communities". Diversity and Distributions 18, n. 3 (24 ottobre 2011): 282–93. http://dx.doi.org/10.1111/j.1472-4642.2011.00858.x.

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40

Gozlan, R. E., J. R. Britton, I. Cowx e G. H. Copp. "Current knowledge on non-native freshwater fish introductions". Journal of Fish Biology 76, n. 4 (marzo 2010): 751–86. http://dx.doi.org/10.1111/j.1095-8649.2010.02566.x.

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41

Mofu, Lubabalo, Ross N. Cuthbert, Tatenda Dalu, Darragh J. Woodford, Ryan J. Wasserman, Jaimie T. A. Dick e Olaf L. F. Weyl. "Impacts of non-native fishes under a seasonal temperature gradient are forecasted using functional responses and abundances". NeoBiota 49 (2 agosto 2019): 57–75. http://dx.doi.org/10.3897/neobiota.49.34986.

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Developing predictive methods to forecast the impacts of existing and emerging invasive species is of critical importance to biodiversity conservation. However, invader impacts are context-dependent, making reliable and robust predictions challenging. In particular, it is unclear how temporal variabilities in relation to temperature regime shifts influence invader ecological impacts. In the present study, we quantify the functional responses of three coexisting freshwater fishes: the native freshwater River Goby Glossogobiuscallidus, and the non-native Mozambique Tilapia Oreochromismossambicus and Western Mosquitofish Gambusiaaffinis, under two temperature treatments using chironomid larvae as prey. This was used along with fish abundance data to determine temporal differences in ecological impacts of each fish species between seasons (i.e. at two corresponding temperatures). All three fish species exhibited potentially population-destabilizing Type II functional responses. Their maximum feeding rates were consistently higher in the warm temperature treatment, whereas attack rates tended to be reduced. Non-native Mozambique Tilapia had the highest maximum feeding rate under both temperature treatments (18 °C and 25 °C), followed by the non-native Western Mosquitofish and lastly the native River Goby, suggesting greater per capita impacts on native prey by non-native fishes. The predatory fish abundances differed significantly according to season, with native River Goby and non-native Mozambique Tilapia generally more abundant than non-native Western Mosquitofish. By multiplying functional response maximum feeding rates with abundances of each fish species across the seasonal gradient, the relative impact potential of non-native Mozambique Tilapia was consistently higher compared to that of native gobies. Western Mosquitofish impacts were less apparent, owing to their low abundances. We demonstrate how seasonal temperature fluctuations affect the relative impact capacities of introduced species and the utility of consumer functional response and the relative impact potential metric in impact forecasting.

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Xiong, Wen, Qiang Wang, Dong Xie, David H. Fletcher e Dekui He. "Factors influencing tropical Island freshwater fishes: species, status, threats and conservation in Hainan Island". Knowledge & Management of Aquatic Ecosystems, n. 419 (2018): 6. http://dx.doi.org/10.1051/kmae/2017054.

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Hainan Island is located within the Indo-Burma global biodiversity hotspot, however, the freshwater fish fauna on this island is poorly understood. Based on field investigations and literature review, we compiled a list of 154 freshwater fish species (138 native and 16 non-native) belonging to 10 orders, 31 families and 104 genera found on Hainan Island. Of these, 31 species are endemic to China. The native freshwater fish fauna in Hainan Island is affiliated to South China sub-region of the Oriental Region. Current knowledge suggests that overexploitation, water pollution, flow modification, habitat degradation, and non-native species have severely reduced the freshwater fish biodiversity in Hainan Island. To protect freshwater fish biodiversity and fisheries in Hainan Island, some new measures should be adopted and current measures better enforced. This study constitutes an important resource for conservation management of freshwater fishes in Hainan Island.

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Escalera-Vázquez, Luis H., Jesús E. García-López, Atahualpa Sosa-López, Nancy Calderón-Cortés e Demián Hinojosa-Garro. "Impact of the non-native locariid fish Pterygoplichthys pardalis in native fish community on a seasonal tropical floodplain in Mexico". Aquatic Ecosystem Health & Management 22, n. 4 (2 ottobre 2019): 462–72. http://dx.doi.org/10.1080/14634988.2019.1700343.

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Ismail, Yahya, Syahruddin Syahruddin e Srisukmawati Zainudin. "PERFORMA AYAM KAMPUNG SUPER YANG DIBERI TEPUNG USUS AYAM SEBAGAI SUBTITUSI TEPUNG IKAN". Jambura Journal of Animal Science 3, n. 2 (26 maggio 2021): 120–28. http://dx.doi.org/10.35900/jjas.v3i2.9783.

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The aim of this research was to analyze the performance of the super native chicken and the optimal level of chicken intestine meal which can substitute fish meal in the feed ration. This study used a completely randomized design (CRD) consisting of 5 treatments and 4 replications. The treatments given were P0 = 10% fish meal + 0% chicken intestine meal in the feed rations, P1 = 7.5% fish meal + 2.5% chicken intestine meal in the feed rations, P2 = 5% fish meal + 5% chicken intestine meal in the feed rations, P3 = 2.5% fish meal + 7.5% chicken intestine meal in the feed ration, P4 = 0% fish meal + 10% chicken intestine meal in the feed ration.The number of super native chickens used in this study was 100 chickens. The results showed that giving chicken intestine meal as a substitute for fish meal in the feed ration had no significant effect (P 0.05) on feed ration consumption, body weight gain, and feed conversion ratio of super native chicken. It can be concluded that giving chicken intestine meal as a substitute for fish meal in the feed ration gives the same performance. Chicken intestine meal can substitute or replace fish meal up to a level of 10% in the feed ration super native chicken.

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Wibowo, Arif, Dwi Atminarso, Lee Baumgartner e Anti Vasemagi. "High prevalence of non-native fish species in a remote region of the Mamberamo River, Indonesia". Pacific Conservation Biology 26, n. 3 (2020): 293. http://dx.doi.org/10.1071/pc19004.

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Abstract (sommario):

Indonesian freshwater fish diversity is threatened by human activities such as logging, land clearing, pollution and introduction of non-native species. The latter may pose serious threats to endemic freshwater fauna even in relatively pristine and isolated habitats. One such area, West Papua in the island of New Guinea, is one of the least studied regions in the world and a biodiversity hotspot. The Mamberamo River contains the highest proportion of non-native fish compared to other major river systems in New Guinea. To document this, we conducted a field study to validate and further temporally characterise the fish biodiversity to ascertain its current status. Since the last ichthyological survey 15 years ago, we detected two additional non-native species (Leptobarbus melanopterus and Oreochromis niloticus) that have established in the river system. Moreover, our survey revealed that non-native fish are extremely common in the mid reaches of the Mamberamo River, comprising 74% of total catch, with non-native Barbonymus gonionotus (family Cyprinidae) now established as the dominant species. The biomass of non-native B. gonionotus now exceeds that of all native fish combined in the main river channel. These results highlight the serious threat of invasive species in remote regions that support high levels of endemic biodiversity. Plans for containment, prevention through education programmes, and management are urgently required.

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Kopf, R. Keller, Paul Humphries, Nick R. Bond, Neil C. Sims, Robyn J. Watts, Ross M. Thompson, Sally Hladyz et al. "Macroecology of fish community biomass – size structure: effects of invasive species and river regulation". Canadian Journal of Fisheries and Aquatic Sciences 76, n. 1 (gennaio 2019): 109–22. http://dx.doi.org/10.1139/cjfas-2017-0544.

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The biomass of organisms of different sizes is increasingly being used to explore macroscale variation in food-web and community structure. Here we examine how invasive species and river flow regulation affect native fish biomass and fish community log10 biomass – body mass scaling relationships in Australia’s largest river system, the Murray–Darling. The log10 biomass – body mass scaling exponent (scaling B) of invasive fishes (95% CI: −0.14 to −0.18) was less negative than for native fishes (95% CI: −0.20 to −0.25), meaning that invasive species attained a higher biomass in larger size-classes compared to native species. Flow alteration and invasive common carp (Cyprinus carpio) biomass were correlated with severe reductions in native fish biomass ranging from −47% to −68% (95% CI). Our study provides novel evidence suggesting that invasive and native communities have different biomass – body mass scaling patterns, which likely depend on differences in their trophic ecology and body size distributions. Our results suggest that restoration efforts using environmental flows and common carp control has potential to boost native fish biomass to more than double the current level.

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Sternberg, David, e Bernie Cockayne. "The ongoing invasion of translocated sleepy cod (Oxyeleotris lineolata) in the Lake Eyre Basin, central Australia". Wildlife Research 45, n. 2 (2018): 164. http://dx.doi.org/10.1071/wr17140.

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Context Present-day distribution records show that Oxyeleotris lineolata (sleepy cod) has colonised many ephemeral streams and refugial waterholes of the Cooper Creek catchment in the Lake Eyre Basin within a decade of the first record or capture. When introduced to new habitats outside its natural range, this species is considered to be a serious conservation risk to native fish species. Aims The present study aims to document the transport, establishment, colonisation and integration of O. lineolata in the Lake Eyre Basin, and quantify its impact on native fish assemblages. Methods Fish samples were taken annually in 21 waterholes between 2011 and 2016, by using a combination of single- and double-winged fyke nets. We collected novel diet and life-history information from 242 O. lineolata individuals across their known distribution. Key results Abundance, length distribution and life-history information suggested a ‘colonising front’ moving downstream, across state jurisdictional boundaries and into the Coongie Lakes Ramsar site. Oxyeleotris lineolata diet is most similar to that of two native generalist invertivore–piscivores and preys on several native fish species. With a derived longevity in excess of 15 years and a life-history strategy that combines batch spawning, high fecundity and parental care (i.e. high juvenile survivorship), there is real potential for O. lineolata to dominate fish assemblages in waterholes that provide refuge for native fishes during dry periods. Conclusions The present study showed that O. lineolata has the potential to negatively influence native fish assemblages through both competition and predation in refugial waterholes. Eradication of O. lineolata from the Cooper Creek catchment in central Australia is highly unlikely, given its widespread distribution, the remoteness of the receiving landscape and a current lack of resources to monitor spread and attempt eradication at the moving front of the Cooper Creek population. Implications Achieving greater awareness of the potential impacts of introducing or spreading non-native species is an important first step towards preserving the native fish fauna of the Lake Eyre Basin. Further research is warranted to fully understand the current and potential future distribution of O. lineolata in the basin, its biological and ecological requirements, and influence on native fish species and assemblages.

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Rytwinski, Trina, Jessica J. Taylor, Lisa A. Donaldson, J. Robert Britton, David R. Browne, Robert E. Gresswell, Mark Lintermans et al. "The effectiveness of non-native fish removal techniques in freshwater ecosystems: a systematic review". Environmental Reviews 27, n. 1 (marzo 2019): 71–94. http://dx.doi.org/10.1139/er-2018-0049.

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In aquatic systems, biological invasions can result in adverse ecological effects. Management techniques available for non-native fish removal programs (including eradication and population size control) vary widely, but include chemicals, harvest regimes, physical removal, or biological control. For management agencies, deciding on what non-native fish removal program to use has been challenging because there is little reliable information about the relative effectiveness of these measures in controlling or eradicating non-native fish. We conducted a systematic review, including a critical appraisal of study validity, to assess the effectiveness of different non-native fish removal methods and to identify the factors that influence the overall success rate of each type of method. We found 95 relevant studies, generating 158 data sets. The evidence base was dominated by poorly documented studies with inadequate experimental designs (76% of removal projects). When the management goal was non-native fish eradication, chemical treatments were relatively successful (antimycin 89%; rotenone 75%) compared with other interventions. Electrofishing and passive removal measure studies indicated successful eradication was possible (58% each) but required intensive effort and multiple treatments over a number of years. Of these studies with sufficient information, electrofishing had the highest success for population size control (56% of data sets). Overall, inadequate data quality and completeness severely limited our ability to make strong conclusions about the relationships between non-native fish abundance and different methods of eradication and population control and the factors influencing the overall success rate of each method. Our review highlights that there is considerable scope for improving our evaluations of non-native fish removal methods. It is recommended that programs should have explicitly stated objectives, better data reporting, and study designs that (when possible and appropriate) incorporate replicated and controlled investigations with rigorous, long-term quantitative monitoring. Future research on the effectiveness of non-native fish removal methods should focus on: (i) the efficacy of existing or potentially new removal measures in larger, more complex environments; (ii) a broader range of removal measures in general; and (iii) phenotypic characteristics of individual fish within a population that fail to be eradicated or controlled.

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Rogosch, Jane S., e Julian D. Olden. "Invaders induce coordinated isotopic niche shifts in native fish species". Canadian Journal of Fisheries and Aquatic Sciences 77, n. 8 (agosto 2020): 1348–58. http://dx.doi.org/10.1139/cjfas-2019-0346.

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Food-web investigations inform management strategies by exposing potential interactions between native and nonnative species and anticipating likely outcomes associated with species removal efforts. We leveraged a natural gradient of compositional turnover from native-only to nonnative-only fish assemblages, combined with an intensive removal effort, to investigate underlying food-web changes in response to invasive species expansion in a Lower Colorado River tributary. Nonnative fishes caused coordinated isotopic niche displacement in native fishes by inducing resource shifts toward lower trophic positions and enriched carbon sources. By contrast, nonnative fishes did not experience reciprocal shifts when native fishes were present. Asymmetrical outcomes between native and nonnative fishes indicated species displacement may result from competitive or consumptive interactions. Native species’ isotopic niches returned to higher trophic levels after nonnative green sunfish (Lepomis cyanellus) removal, indicating removal efforts can support trophic recovery of native fishes like desert suckers (Catostomus clarkii) and roundtail chub (Gila robusta). Using stable isotope analysis in preremoval assessments provides opportunities to identify asymmetric interactions, whereas postremoval assessments could identify unintended consequences, like mesopredator release, as part of adaptive decision making to recover native fishes.

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50

LEPRIEUR, F., M. A. HICKEY, C. J. ARBUCKLE, G. P. CLOSS, S. BROSSE e C. R. TOWNSEND. "Hydrological disturbance benefits a native fish at the expense of an exotic fish". Journal of Applied Ecology 43, n. 5 (23 agosto 2006): 930–39. http://dx.doi.org/10.1111/j.1365-2664.2006.01201.x.

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