Journal articles: 'Aquaculture Victoria'

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Awal, Sadiqul, Andrew Christie, Matthew Watson, and Asanka G. T. Hannadige. "Perception of Aquaculture Education to Support Further Growth of Aquaculture Industry in Victoria, Australia." Journal of Agricultural Education and Extension 18, no. 3 (June 2012): 269–84. http://dx.doi.org/10.1080/1389224x.2012.670052.

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Hamilton, Stuart E., Silviya M. Gallo, Noah Krach, Chrisphine S. Nyamweya, John K. Okechi, Christopher M. Aura, Zachary Ogari, Paige M. Roberts, and Les Kaufman. "The use of unmanned aircraft systems and high-resolution satellite imagery to monitor tilapia fish-cage aquaculture expansion in Lake Victoria, Kenya." Bulletin of Marine Science 96, no. 1 (January 1, 2020): 71–94. http://dx.doi.org/10.5343/bms.2019.0063.

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Lake Victoria, the largest lake in the tropics, has a storied history that includes recent shifts in ecology due to a variety of point and nonpoint source anthropogenic impacts. Among the expanding industries contributing to environmental impacts (if not properly managed) is the recent and rapid expansion of cage aquaculture of Nile tilapia (Oreochromis niloticus). As part of an effort to assess the ecological consequences of this new industry, unmanned aerial systems (UAS), very high-resolution satellite imagery, and geographic information systems (GIS) were used to map the tilapia fish cages in the Kenya portion of Lake Victoria, Africa. Understanding the impacts of the growth of commercial finfish cage culture within Lake Victoria requires a systems view which, through the use of UAS and satellite technologies, can provide spatial context and change detection. This synthesis of UAS, very high-resolution satellite imagery, and GIS has allowed for accurate and rapid mapping of inshore tilapia fish cages with high positional accuracy. The significance of these observations lies in the speed and detection accuracy in the methodology, allowing for rapid visualization and assessment of cage culture in the Kenyan portion of Lake Victoria. As of 2012, there were very few floating aquaculture finfish cages in the Kenyan portion of Lake Victoria. Using UAS, satellite, and GIS technologies, in 2018 the same portion of the lake was found to contain 4357 fish cages covering 62,132 m>2.

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Mwanja, Wilson Waiswa, Anne Akol, Laila Abubaker, Matthew Mwanja, Scot Batman Msuku, and Fred Bugenyi. "Status and impact of rural aquaculture practice on Lake Victoria basin wetlands." African Journal of Ecology 45, no. 2 (October 26, 2006): 165–74. http://dx.doi.org/10.1111/j.1365-2028.2006.00691.x.

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Orina, Paul, Erick Ogello, Elijah Kembenya, Cecilia Muthoni, Safina Musa, Veronica Ombwa, Venny Mwainge, et al. "The state of cage culture in Lake Victoria: A focus on sustainability, rural economic empowerment, and food security." Aquatic Ecosystem Health & Management 24, no. 1 (January 2, 2021): 56–63. http://dx.doi.org/10.14321/aehm.024.01.09.

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Abstract Capture fisheries and aquaculture have remained important sources of food, nutrition, income and livelihoods to millions globally, with annual per capita consumption of fish in developing countries having increased from 5.2 kg in 1961 to 18.8 kg in 2013. On the contrary, low income food-deficit countries annual fish per capita consumption rose from 3.5 to 7.6 kg against 26.8 kg among industrialized countries. Increased demand for animal protein and declining capture fisheries has seen aquaculture grow rapidly than any other food production sector over the past three decades. Rapid global aquaculture growth is directly related to levels of technological advancement, adoption and adaption prompting aquaculture transition from semi-intensive to intensive and super intensive production systems among developing and developed countries. In light of the aquatic environment economic potential, cage culture in Lake Victoria is fast gaining prominence in aquaculture production contribution. This began with trials by Kenya Marine and Fisheries Research Institute and Uganda’s National Fisheries Resource Research Institute and later by private investors at Dunga and Obenge beaches of Kenya, Source of the Nile in Uganda and Bulamba Beach Management Units in Bunda District of Tanzania. However, only Kenya has so far documented cage culture development recording 3,696 cages across the five riparian counties with an estimated production capacity of 3,180 MT valued at Kshs 955.4 Million (9.6 million USD), created over 500 jobs directly and indirectly created income opportunities for over 4,000 people. The sub-sector’s value chain, its supportive value chains and associated enterprises are rapidly expanding thus creating jobs, enhancing incomes and ensuring food security in rural and urban areas. As cage culture commercialization takes root, there is urgent need to address issues such as introduction of alien species, diseases, marine parks and maximum carrying capacity among other aspects. This will require trans-boundary policy to ensure sustainable utilization of the lake as a common resource.

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van den Enden, Tony, Robert W. G. White, and Nicholas G. Elliott. "Genetic variation in the greenback flounder Rhombosolea tapirina GÜnther (Teleostei, Pleuronectidae) and the implications for aquaculture." Marine and Freshwater Research 51, no. 1 (2000): 23. http://dx.doi.org/10.1071/mf99022.

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Samples of the greenback flounder, Rhombosolea tapirina, were collected from five Tasmanian sites and from one site each off Victoria and New Zealand. Thirty enzyme-coding loci were analysed by gel electrophoresis. Seventeen loci were variable, nine of which were polymorphic in at least four samples. Average heterozygosity across all 30 loci was relatively high at 0.086 ± 0.032. There were significant genetic differences between the Australian and New Zealand samples, with a genetic distance of 0.041, which was an order of magnitude larger than that observed between any Australian samples. Samples from the west coast of Tasmania and from Victoria were genetically isolated from each other and from the remaining four Tasmanian samples; the latter showed little variation among themselves. Reductions in genetic variation (heterozygosity and alleles) were observed in two cultured cohorts when compared with the wild-caught samples, with corresponding low estimates of effective population sizes compared with putative breeding numbers. No genetic variation was detected between normal and malpigmented individuals from the same culture cohort.

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Ford, John R., and Paul Hamer. "The forgotten shellfish reefs of coastal Victoria: documenting the loss of a marine ecosystem over 200 years since European settlement." Proceedings of the Royal Society of Victoria 128, no. 1 (2016): 87. http://dx.doi.org/10.1071/rs16008.

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Victoria has lost vast areas (>95%) of native flat oyster (Ostrea angasi, Sowerby 1871) and blue mussel (Mytilus edulis galloprovinicialis, Lamarck 1819) reefs from estuarine and coastal waters since European settlement. We document the decline of these reefs by examining indigenous use of shellfish, the decimation of oyster reefs by dredge fishing in early colonial days (1840s–1860s) and later removal of mussel reefs by the mussel and scallop dredging industry (1960s‒1990s). Review of current scientific information reveals no notable areas of continuous oyster reef in Victoria and we consider this habitat to be functionally extinct. While the large-scale removal and destructive fishing practices that drove the rapid declines have not occurred since the mid-1990s, a natural recovery has not occurred. Recovery has likely been hampered historically by a host of factors, including water quality and sedimentation, lack of shell substrate for settlement, chemical pollution impacts, disease of native flat oysters (Bonamia), and more recently introduced species that compete with or prey on shellfish. However, research in the United States has demonstrated that, by strategic selection of appropriate sites and provision of suitable settlement substrates, outplanting of aquaculture-reared oysters and mussels can re-establish shellfish reefs. While a long-term sustained and structured approach is required, there is potential to re-establish shellfish reefs as a functioning ecological community in Victoria’s coastal environment.

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Hoinkis, Jan. "VicInAqua - Integrated aquaculture based on sustainable water recirculating system for the Victoria Lake Basin (VicInAqua) - H2020." Impact 2018, no. 9 (December 12, 2018): 94–96. http://dx.doi.org/10.21820/23987073.2018.9.94.

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HUTSON, KATE S., and IAN D. WHITTINGTON. "Paradeontacylix godfreyi n. sp. (Digenea: Sanguinicolidae) from the heart of wild Seriola lalandi (Perciformes: Carangidae) in southern Australia." Zootaxa 1151, no. 1 (March 14, 2006): 55. http://dx.doi.org/10.11646/zootaxa.1151.1.5.

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Paradeontacylix godfreyi n. sp. (Digenea: Sanguinicolidae) is described from the heart of wild yellowtail kingfish, Seriola lalandi Valenciennes, 1833, collected near Port Augusta, northern Spencer Gulf, South Australia. One specimen of P. godfreyi was also collected from the heart of a single wild specimen of S. lalandi captured near Killarney, Victoria. Paradeontacylix godfreyi is distinguished from other species in the genus by a combination of morphological characters including the shape and number of posterior tegumental spines, the number of rows of tegumental spines along the ventral body margin, the maximum number of marginal tegumental spines per row, the number of testes and the extent of the testicular field. Comparisons are made with a Paradeontacylix sp. collected from the heart of wild Samson fish, S. hippos Günther, 1876 from Greenly Island, South Australia and from the heart of wild S. lalandi from Killarney, Victoria. We also document a new host record for P. sanguinicoloides McIntosh, 1934 from the heart of wild S. hippos from Greenly Island, South Australia. The importance of determining potential intermediate hosts for Paradeontacylix species in relation to South Australian S. lalandi aquaculture is discussed.

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Berg, Håkan, Deogratias Mulokozi, and Lars Udikas. "A GIS Assessment of the Suitability of Tilapia and Clarias Pond Farming in Tanzania." ISPRS International Journal of Geo-Information 10, no. 5 (May 20, 2021): 354. http://dx.doi.org/10.3390/ijgi10050354.

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Aquaculture production in Tanzania has increased in recent years, responding to an increased demand for fish, but the scale and productivity of smallholder aquaculture remains below the level needed to support significant sector growth in Tanzania. This study assesses, through geospatial analyses, the suitability for freshwater pond farming of Oreochromis niloticus and Clarias gariepinus in Tanzania, by assessing the geographical distribution of seven criteria (water availability, water temperature, soil texture, terrain slope, availability of farm inputs, potential farm-gate sales, and access to local markets) identified as important for fish pond farming. The criteria were developed and standardized from 15 sub-criteria, which were classified into a four-level suitability scale based on physical scores. The individual weights of the different criteria in the overall GIS suitability assessment were determined through a multi-criteria evaluation. The final results were validated and compared through field observations, interviews with 89 rural and 11 urban aquaculture farmers, and a questionnaire survey with 16 regional fisheries officers. Our results indicate that there is a good potential for aquaculture in Tanzania. Almost 60% of Tanzania is assessed as being suitable and 40% as moderately suitable for small-scale subsistence pond farming, which is the dominating fish farming practice currently. The corresponding figures for medium-scale commercial farming, which many regions expect to be the dominating farming method within ten-years, were 52% and 47% respectively. The availability of water was the most limiting factor for fish pond farming, which was confirmed by both farmers and regional fisheries officers, and assessed as being “suitable” in only 28% of the country. The availability of farm-gate sales and local markets were “moderate suitable” to “suitable” and were seen as a constraint for commercial farms in rural areas. The availability of farm inputs (agriculture waste and manure) was overall good (26% very suitable and 32% suitable), but high-quality fish feed was seen as a constraint to aquaculture development, both by farmers and regional fisheries officers. Soil, terrain, and water temperature conditions were assessed as good, especially at low altitudes and in regions close to the sea and south of Lake Victoria.

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Kipkemboi, J., A. A. van Dam, J. M. Mathooko, and P. Denny. "Hydrology and the functioning of seasonal wetland aquaculture–agriculture systems (Fingerponds) at the shores of Lake Victoria, Kenya." Aquacultural Engineering 37, no. 3 (November 2007): 202–14. http://dx.doi.org/10.1016/j.aquaeng.2007.06.004.

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Odhiambo, Elija, Paul O. Angienda, Patrick Okoth, and David Onyango. "Stocking Density Induced Stress on Plasma Cortisol and Whole Blood Glucose Concentration in Nile Tilapia Fish (Oreochromis niloticus) of Lake Victoria, Kenya." International Journal of Zoology 2020 (July 17, 2020): 1–8. http://dx.doi.org/10.1155/2020/9395268.

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Effects of high stocking densities (HSDs) were evaluated for Nile tilapia fish (Oreochromis niloticus) under culture to determine its influence on plasma cortisol and whole blood glucose concentration. Plasma cortisol levels (ng/ml) were assayed by Enzyme-Linked Immunosorbent Assay (ELISA). Whole blood glucose levels were determined using a hand-held one touch ultraglucose meter (MD-300) and test strips. Plasma cortisol and whole blood glucose level determinations were replicated three times for O. niloticus reared under both low stocking densities (LSD) and HSD. One way Analysis of Variance (ANOVA) was performed on the data collected, and comparison of significant differences in means was carried out between LSD and HSD at 0.01%. Plasma cortisol levels revealed statistically (P≤0.01) significant values of HSD at 6.32 ± 1.06 ng/ml than in LSD at 4.62 ± 1.58 ng/ml for the O. niloticus groups studied. Whole blood glucose analysis revealed a statistical (P<0.05) difference in the means in HSD and LSD O. niloticus groups (F(df,1; 8) = 7.946 > Fcrit = 4.414; P=0.01). Mean plasma glucose concentration was statistically (P≤0.01) higher for HSD than LSD O. niloticus groups at mean ± SD, 96.84 ± 5.28 and 76.82 ± 5.92, respectively. The findings of this study demonstrate that high stocking densities increase both cortisol and whole blood glucose concentration in tilapia fish, indicating a marked increase in stress levels. Elevated plasma cortisol and whole blood glucose concentration can be used as biomarkers for acute stress in O. niloticus produced under aquaculture systems. The findings of this study can help inform policy on the management of stress caused by overstocking of O. niloticus and other related Cichlids under industrial aquaculture production.

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Emily Jepyegon, Chemoiwa. "The current status of Barbus species in Lake Victoria Basin, Kenya: A review." International Journal of Aquaculture and Fishery Sciences 8, no. 3 (September 27, 2022): 092–97. http://dx.doi.org/10.17352/2455-8400.000083.

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Lake Victoria is known for its rich fish biodiversity having been home to over 500 fish species. However, over 200 species have become extinct and as a result, it is classified as a world hotspot of species loss. Some of the examples of endemic species that disappeared from the lake and are endangered include the Haplochromines and the Barbus species. The Barbus species is currently not seen in the fish landings from Lake Victoria. It is deemed to have sought refuge in the riverine ecosystems, dams and the adjacent satellite lakes within the Lake Victoria Basin. This has resulted in several gaps emerging including its current status as its taxonomical identification still remains a puzzle to many scientists. This paper, therefore, tries to unearth the foregoing by reviewing the already available literature with an emphasis on the LVB Kenyan part. The Labeobarbus altianalis is still named Barbus altianalis even in the most recent publications thus complicating further. In its distribution, the Barbus species does not occur in the lake currently but is a common candidate in the rivers, dams and satellite lakes within the basin. Some of the cited reasons for its disappearance: are predation by Lates niloticus, overfishing, competition from exotic species, pollution and climate change. However, different studies try to pinpoint its presence in some rivers and this according to an observation made in this study is due to biased sampling, which excludes some rivers in the basin. It is concluded that the taxonomic identification of Barbus species in LVB Kenya remains elusive and this has been blamed on skewed sampling with little regard to all ecosystems in the basin. The paper recommends that an elaborate simultaneous study be done in all the rivers within the LVB, Kenya to collect reliable data for use in Barbus species taxonomy and general biology. Further, county governments in the basin should develop sound policy frameworks on how to sustainably manage riverine fisheries including the domestication of the species in aquaculture.

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Chibwana, F. D., and G. Nkwengulila. "Variation in the morphometrics of diplostomid metacercariae (Digenea: Trematoda) infecting the catfish, Clarias gariepinus in Tanzania." Journal of Helminthology 84, no. 1 (July 21, 2009): 61–70. http://dx.doi.org/10.1017/s0022149x09990083.

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AbstractDiplostomum species are economically important worldwide due to their metacercariae which parasitize the eyes of fish, in both natural and aquaculture systems. However, their striking morphological similarity, especially at the metacercarial stage, makes species separation difficult. Three closely related diplostomid metacercariae, namely Diplostomum mashonense (type 3), Tylodelphys sp. 1 and 2 (type 1 and 2, respectively), coexist in the cranial cavity of the catfish, Clarias gariepinus from Mindu dam, Lake Victoria, Msimbazi, Ruvu and Kilombero rivers. The morphometrics of these three species were analysed by discriminant function analysis to investigate the degree of variation among the populations from the five localities sampled. The first canonical functions for all visual examination plots accounted for over 50% of the between-group variability. The observed differences were mainly from measurements associated with length, indicating that these measurements are important in the description of population characteristics. Visual examination of the samples along the canonical functions showed a clear between-population differentiation. The overall random assignment of individuals into their original groups was high (97%). These extensive morphometric variations introduce doubt about the reliability of measurements in the determination of species in these trematodes, as they may lead to misidentifications.

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KIPKEMBOI, J., A. A. VAN DAM, M. M. IKIARA, and P. DENNY. "Integration of smallholder wetland aquaculture?agriculture systems (fingerponds) into riparian farming systems on the shores of Lake Victoria, Kenya: socio-economics and livelihoods." Geographical Journal 173, no. 3 (September 2007): 257–72. http://dx.doi.org/10.1111/j.1475-4959.2007.00246.x.

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Kipkemboi, Julius, Anne A. van Dam, and Patrick Denny. "Environmental impact of seasonal integrated aquaculture ponds ('fingerponds') in the wetlands of Lake Victoria, Kenya: an assessment, with the aid of Bayesian Networks." African Journal of Aquatic Science 32, no. 3 (November 2007): 219–34. http://dx.doi.org/10.2989/ajas.2007.32.3.1.300.

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Dias, P. Joana, Seema Fotedar, and Michael Snow. "Characterisation of mussel (Mytilus sp.) populations in Western Australia and evaluation of potential genetic impacts of mussel spat translocation from interstate." Marine and Freshwater Research 65, no. 6 (2014): 486. http://dx.doi.org/10.1071/mf13179.

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In the present study, we investigate the potential impact of the first proposed interstate translocation of mussel spat, for aquaculture enhancement, on the genetic integrity of Mytilus populations in Western Australia (WA). We performed genetic analysis on four populations (Garden Island, Bunbury, Albany and Esperance) in WA and on mussels from three hatcheries in South Australia (SA), Victoria (Vic) and Tasmania (Tas) proposed as spat sources in the translocation application. Two genetically distinct groups of M. galloprovincialis were identified, which corresponded to introduced Northern Hemisphere and native Southern Hemisphere haplotypes. Mussels obtained from the hatcheries showed a marked proportion of native haplotypes, while mussels of three (Garden Island, Bunbury and Esperance) of the four sampled WA Mytilus populations consisted mostly of introduced haplotypes. Most importantly, all samples were notable for a mixture of native and introduced haplotypes with the great majority of introduced haplotypes occurring in both WA and eastern states samples. Based on these results, it seems unlikely that the proposed translocation of mussel spat could negatively impact WA Mytilus populations. The current study presents valuable information regarding the genetic composition of Mytilus populations and will prove useful in the assessment of future translocation applications and biodiversity of mussel species in WA.

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Shamsi, S., A. Turner, and S. Wassens. "Description and genetic characterization of a newContracaecumlarval type (Nematoda: Anisakidae) from Australia." Journal of Helminthology 92, no. 2 (May 5, 2017): 216–22. http://dx.doi.org/10.1017/s0022149x17000360.

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AbstractNematode parasites belonging to the genusContracaecumare economically important parasites with zoonotic significance. AdultContracaecumspp. are found in the stomach of marine mammals or piscivorous birds, and larval stages infect a wide range of invertebrates and fish species. Human infection withContracaecumlarvae has been reported in Australia and other countries after the consumption of infected fish. Although the genusContracaecumcomprises numerous species, thus far only fourContracaecumlarval types have been specifically identified, therefore their life cycle and biology are not yet fully understood. In this study, a newContracaecumlarva (type IV), found in the intestinal tissue of carp caught from Coonancoocabil Lagoon, New South Wales, Australia, is described and characterized genetically. It was identified asContracaecum bancrofti,a unique Australian species reported previously from the Australian pelican in Northern Territory, New South Wales, Victoria and South Australia. This study highlights the role of migratory birds and introduced fish species, such as carp, in distributing zoonotic pathogens not only across the continent but also from marine to freshwater systems. Coonancoocabil Lagoon is located in the Murrumbidgee Valley National Park, a highly managed conservation area with native fish in wetlands located in close proximity to several fish farms and hatcheries. Infection of a highly resilient invasive fish species, such as carp, with a zoonotic parasite of low host specificity, such asContracaecumlarvae, should be alarming for aquaculture and environmental authorities.

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Mwainge, Venny Mziri, Caleb Ogwai, Christopher Mulanda Aura, Alice Mutie, Veronica Ombwa, Hilda Nyaboke, Kennedy Ngoko Oyier, and Joseph Nyaundi. "An overview of fish disease and parasite occurrence in the cage culture of Oreochromis niloticus: A case study in Lake Victoria, Kenya." Aquatic Ecosystem Health & Management 24, no. 1 (January 2, 2021): 43–55. http://dx.doi.org/10.14321/aehm.024.01.08.

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Abstract Cage aquaculture has been on a steady rise in Lake Victoria, Kenya, since 2016, resulting in the current culturing of over 3,600 cages of Tilapia (O. niloticus) (Orina et al., 2018). Unfortunately, there has been limited, if any, focus on fish health aspects. Rise in intensification and commercialization predisposes fish stocks to disease due to rise in stress levels and consequent reduction in the fish immunity. Nutrient rich surroundings create a conducive environment for rapid proliferation of bacterial and saprophytic fungal growth leading to net clogging and consequently a low biological oxygen demand. Such conditions predispose the stocks to infections. This study was conducted to provide a baseline analysis of the health conditions/status of the cultured fish in this region. It encompassed studies from 2016 to 2018 on tilapia of the genus O. niloticus using both experimental (using standard procedures and protocols) and socio-economic studies (using structured questionnaires, see annexure 1). Results found the following occurrences; bacterial infections (10%), fungal infestations (12.5%), myxosporean parasites in the gills (5%), parasitic copepods (10%) and fin rot (2.5%) in the stocks. There were no significant differences between abiotic parameters in the cage locations and the wild (p > 0.05). Additionally, 90% of the respondents had no fish disease training or clue on the treatment action necessary whenever fish diseases struck. Findings from this study put to the fore the significance of fish diseases in a cage culture system in light of commercialization of the industry and the importance of biosecurity and maintenance of optimal environmental conditions within the scope of Blue Economy growth in this region. This study did not detect any disease or parasite of zoonotic importance.

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Njiru, James, Johnston O. Omukoto, Edward N. Kimani, Christopher Mulanda Aura, and Martin Van der Knaap. "Kenya marine fisheries: The next frontier for economic growth?" Aquatic Ecosystem Health & Management 24, no. 1 (January 2, 2021): 97–104. http://dx.doi.org/10.14321/aehm.024.01.14.

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Abstract The economic potential of Kenya marine resources is critical for the socioeconomic development. The current study reports fisheries output from marine systems in Kenya as a priority for Blue Economy investment in order to rival the current production from inland systems as a trigger for sustainable development. The assessment of fish landings and economic value was based on Catch Assessment Surveys, cruises and secondary literature. Kenya’s inland capture fisheries contributes about 83%, aquaculture 12%, and marine artisanal fisheries 5%. Lake Victoria that contributes up to 90% of inland capture fish production has shown decline in catches in the recent past and the trend indicates that the fishery may not be sustainable. The Kenya Exclusive Economic Zone has a coast line of about 647 km and an area of 142,000 km2 that constitutes about 42% of the country’s surface area and has several commercially important species that are barely exploited; yet it produces a paltry 26,000 mt annually that is estimated at an export value of about USD 50 million. However, recent estimates have found that Kenya Exclusive Economic Zone could contain up to 2 million mt of fish that is valued at about USD 130 million. Furthermore, additional worth along the value chain and with substantial trickle-down effect that could have a positive impact on the Blue Growth in Kenya and other developing nations with oceanic potential – triggering the possibility for sustainable exploitation.

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Mills, Derek. "Ponds, passes and parcs. Aquaculture in Victorian Ireland." Aquaculture 93, no. 2 (March 1991): 199–200. http://dx.doi.org/10.1016/0044-8486(91)90218-v.

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Omwoma, Solomon, Philip O. Owuor, David M. K. Ongeri, Moses Umani, Joseph O. Lalah, and Karl-Werner Schramm. "Declining commercial fish catches in Lake Victoria's Winam Gulf: The importance of restructuring Kenya's aquaculture programme." Lakes & Reservoirs: Research & Management 19, no. 3 (September 2014): 206–10. http://dx.doi.org/10.1111/lre.12068.

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Danjuma, A. M., H. A. Aliyu, R. S. Umar, and K. Abubakar. "Topographical and Physical Assessment for Cage Aquaculture Suitability Survey in Inland." Asian Journal of Advanced Research and Reports, June 12, 2020, 10–19. http://dx.doi.org/10.9734/ajarr/2020/v11i130254.

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This research was aimed to assess the suitability of Kijjude and Kala bays on Lake Victoria in Kalangala District for cage aquaculture. This study used a quasi-experiment research design. General environmental and physical data were collected and used to assess suitability of Kijjude and Kala bays for suitability for cage aquaculture by comparing the various measured parameters with the acceptable standards for cage aquaculture. Data were taken from a total of 14 and 6 points within Kijjude and Kala bays respectively. Systematic random sampling was used to determine the above mentioned sampling points. Kala bay was found to be suitable for both High Volume Low Density (HVLD) and Low Volume High Density (LVHD) cage. All sampled points within Kijjude bay were found to be only suitable for Low Volume High Density (LVHD) cage aquaculture except site KA whose depth was found to be less than 4.0 (m).

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Okechi, John Kengere, Nick Peoples, Chrisphine Sangara Nyamweya, Sarah Glaser, and Leslie Kaufman. "The ecological health of Lake Victoria (Kenya) in the face of growing cage aquaculture." Conservation Science and Practice, October 7, 2022. http://dx.doi.org/10.1111/csp2.12826.

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Barasa, James E., Sinebongo Mdyogolo, Romulus Abila, Johannes Paul Grobler, Robert A. Skilton, Hesmari Bindeman, Moses Ndotono Njahira, et al. "Genetic diversity and population structure of the African catfish, Clarias gariepinus (Burchell, 1822) in Kenya: implication for conservation and aquaculture." Belgian Journal of Zoology 147, no. 2 (September 28, 2017). http://dx.doi.org/10.26496/bjz.2017.9.

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African catfish, Clarias gariepinus, is an important species in aquaculture and fisheries in Kenya. Mitochondrial D-loop control region was used to determine genetic variation and population structure in samples of C. gariepinus from 10 sites including five natural populations (Lakes Victoria (LVG), Kanyaboli (LKG), Turkana (LTA), Baringo (LBA) and Jipe (LJP), and five farms (Sangoro Aquaculture Center (SAN), Sagana Aquaculture Centre (SAG), University of Eldoret Fish Farm (UoE), Kibos Fish Farm (KIB), and Wakhungu Fish Farm (WKU)) in Kenya. Similarly, samples from eight localities (four natural populations: LVG/LKG, LTA, LBA, and four farmed: SAN, SAG, KIB, UoE) were genotyped using six microsatellite DNA loci. For the D-loop control region, samples from natural sites exhibited higher numbers of haplotypes and haplotype diversities compared to farmed samples, and 88.2% of haplotypes were private. All except LJP and LTA shared haplotypes, and the highest number of shared haplotypes (8) was detected in KIB. The 68 haplotypes we found in 268 individuals grouped into five phylogenetic clades: LVG/LKG, LTA, LBA, LJP and SAG. Haplotypes of farmed C. gariepinus mostly have haplotypes typical of LVG/LKG, and some shared haplotypes of the LBA population. Microsatellite analysis showed farmed samples have higher numbers of alleles than natural samples, but higher observed and expected heterozygosity levels were found in samples of natural populations. Fifteen pair-wise comparisons had significantly different FST values. All samples were in Hardy-Weinberg equilibrium. Samples from the eight localities grouped into four genetic clusters (LVG/LKG, LTA, LBA and SAG), indicating genetically distinct populations, which should be considered for aquaculture and conservation.

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Egessa, Robert, Gandhi Willy Pabire, and Henry Ocaya. "Benthic macroinvertebrate community structure in Napoleon Gulf, Lake Victoria: effects of cage aquaculture in eutrophic lake." Environmental Monitoring and Assessment 190, no. 3 (February 2, 2018). http://dx.doi.org/10.1007/s10661-018-6498-5.

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Jackson, Sue. "Caring for Waterscapes in the Anthropocene: Heritage-making at Budj Bim, Victoria, Australia." Environment and History, 2022. http://dx.doi.org/10.3197/096734022x16384451127393.

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Australian waterscapes were fashioned to meet human needs during the ancient Aboriginal past through the construction of weirs, fish traps and small dams and accompanying socio-cultural practices and institutions. Exemplary amongst Australian water cultures was that of the Gunditjmara of western Victoria, who for thousands of years practiced a sophisticated form of swamp engineering and eel farming in the volcanic landscapes of Budj Bim. Within 150 years of European colonisation, frontier violence, dispossession and hydrological alteration had put an end to the most extensive and oldest aquaculture system in the world. Recent land and water restitution measures enacted in collaborative partnerships with the wider watershed community have enabled the Gunditjmara to restore the Budj Bim wetlands and rebuild their nation. This process entails re-storying engineering and eeling: cultural practices and connections are being retold to gain recognition for the capacity to negotiate change and adapt to geological, climatological and imperial forces. Critical theory and concepts relating to waterscapes, hydro-social relations and the Anthropocene assist in interpreting the resilient efforts of a rural community to retrieve its history and find new ways to care for the past as well as the future.

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Barroso, Hortência De Souza, Janaina A. Santos, Rozane V. Marins, and Luiz Drude Lacerda. "Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions." Journal of Limnology 77, no. 1 (November 2, 2017). http://dx.doi.org/10.4081/jlimnol.2017.1698.

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The present study was carried out in Castanhão Reservoir, a large aquatic system in the Brazilian semi-arid region that serves multiples uses as water drinking supply and intensive fish-cage aquaculture site. In order to understand the effects of environmental conditions on the spatial and temporal variability of the phytoplankton functional groups (FG) and the main ‘characterizing taxa’, sub-superficial water samples were collected from March 2012 to August 2013, a period distinguished by the continuous drop in reservoir volume due to rainfall shortage. Eighteen functional groups and 102 total phytoplankton taxa were found in the Castanhão reservoir during the study. No significant differences were observed relative to spatial variation of total phytoplankton composition throughout the reservoir (PERMANOVA, P>0.05). On the other hand, according to cluster analysis results, three temporal phases have been identified (Similarity Profile, P<0.05), based on 102 phytoplankton taxa. The ‘characterizing taxa’ was found using the Similarity Percentage procedure (cut-off 90%), being thus defined as those taxa that contributed the most to the similarity within each temporal phase. Nineteen ‘characterizing taxa’ described the Castanhão reservoir, with predominance of those typical of mixing and turbidity conditions. Cyanobacteria dominated through the three temporal phases. According to the redundancy analysis, nutrient availability and water transparency were found to influence the phytoplankton temporal dynamics. The phase I (rainy season) was most represented by Planktolyngbya minor/Pl. limnetica (FG = S1), which reached best performance under strongly decreased phosphate-P concentrations and low water transparency. In phase II (dry season), Romeria victoriae (FG = ?) outcompeted other cyanobacteria probably due the increase in water transparency and decrease in ammonium-N. Finally, in phase III (rainy season) the decrease of water transparency triggered a recovery of shade-adapted cyanobacteria, but at this time mostly represented by Pseudanabaena limnetica (FG = S1). Phase III was also distinctive from the other ones by the highest Nitrate-N and phosphate-P concentrations related to thermocline disruption, which favored an increase in total phytoplankton biomass recorded by the augment of green algae density (FGs = X1, J and F). We concluded that the temporal dynamics of phytoplankton composition was associated to environmental changes in Castanhão Reservoir from 2012 to 2013, which were driven by seasonal climate variation from region (rainy/dry seasons), as well as, by the reduction in reservoir volume that resulted in the disruption of the thermocline, water mixing and an increase in inorganic P and N.

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Journal articles on the topic 'Aquaculture Victoria'

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