Plankton and fish nutrition in African lakes

Abo-Taleb, Hamdy A.; El-Tabakh, Mohamed A.; Hendy, Dina M.

doi:10.1016/b978-0-323-95527-0.00017-8

Cited by 2 publications

(3 citation statements)

References 120 publications

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“…Compared to conventional field surveys and current strategic EIAs, this method improves significantly cage site selection. This approach is particularly vital for addressing the growing demand for fish production without jeopardizing the lake ecosystem and the well‐being of riparian communities, a crucial concern in the Lake Victoria, which is currently facing various threats such as eutrophication (Abo‐Taleb et al., 2023; Olokotum et al., 2020), overfishing (Outa et al., 2020), and climate change (Luhunga & Songoro, 2020). Thus, the GIS‐MCE overall model can be applied not only in Lake Victoria but also in other aquatic environments to identify suitable sites for fish cage investments, contributing to the conservation of aquatic ecosystems.…”

Section: Discussionmentioning

confidence: 99%

“…Currently, the number of fish cage farms in the Tanzanian part of Lake Victoria is estimated to be over 900 (URT, 2023). Nevertheless, Lake Victoria is recognised as an ecologically sensitive water body and is currently under various threats such as increased eutrophication (Abo‐Taleb et al., 2023; Olokotum et al., 2020), overfishing (Outa et al., 2020), and climate change (Luhunga & Songoro, 2020). Thus, proper site selection is critical not only for cage aquaculture sustainability but also for conserving the environment (Kimirei et al., 2017) and biodiversity (Mgaya et al., 2017) of the Lake Victoria.…”

Section: Introductionmentioning

confidence: 99%

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Use of GIS‐based multicriteria evaluation for improved selection of suitable sites for cage fish farming in Mwanza Gulf, Lake Victoria

Mabula,

Kisanga,

Pamba

et al. 2023

Aquaculture Fish & Fisheries

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Stagnating capture fisheries and increasing fish protein demand necessitate aquaculture production to bridge the gap. Lake Victoria is a potential water body for increasing fish production through cage farming. The sustainability of Lake Victoria for cage farming depends on timely and holistic site selection. However, current site selection methods involve complex, resource‐intensive field surveys that lack a holistic approach to integrate multiple factors. Accordingly, information regarding suitable sites for sustainable fish cage farming in Lake Victoria remains scarce. In this study, a transparent geographic information systems (GIS) and multicriteria evaluation (MCE) here after reffered to as GIS‐MCE was used to reveal potential sites to be permitted or avoided during cage aquaculture development in the Mwanza Gulf of Lake Victoria (Tanzania). Our analysis involved weighting and integration of sub‐models representing ecologically sensitive areas, physical environment, and socio‐economic and water quality variables into a single spatial model portraying different site suitability levels in the Mwanza Gulf. The results indicated that the sub‐models identified relatively larger suitable and most suitable sites compared to the overall model. No site maintained its status across all sub‐models. The overall model designated a small area (5.10 km2 or 1.52%) as the most suitable site, with 24.20 km2 (7.44%) as suitable, 64.47 km2 (19.82%) as less suitable, and 42.63 km2 (13.12%) as unsuitable for cage fish farming. The remaining area (188.84 km2 or 58.06%) was a constrained site to be avoided during cage aquaculture development. Taken together, the individual sub‐models are ineffective in designating potential sites for fish cage culture and thus should not be used solely. The GIS‐MCE general model provides a fast and timely method for identifying potential sites for cage farming in Lake Victoria. Fish farmers and managers should use the GIS‐MCE overall model in inland waters to facilitate site selection for complying with licensing requirements and decrease field extensive surveys.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of GIS‐based multicriteria evaluation for improved selection of suitable sites for cage fish farming in Mwanza Gulf, Lake Victoria

Mabula,

Kisanga,

Pamba

et al. 2023

Aquaculture Fish & Fisheries

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“…Eutrophication due to the growth of nutrients changes the food base, and intensive fishing of valuable fish species changes the structure of ichthyocenoses. These factors lead to changes in fish stocks and structure of bioresources [4,9,10].…”

Section: Introductionmentioning

confidence: 99%

Biological resources of Lake Kroshnozero (North-West of Russia)

Syarki,

Sidorova,

Georgiev

et al. 2023

E3S Web Conf.

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A comprehensive analysis of plankton and benthic communities, composition, structure and quantitative characteristics indicate that the ecosystem of Lake Kroshnozero has a eutrophic status or a transitional one between the β-mesotrophic and α-eutrophic. Plankton communities are in a stable state and provide a sustainable food base for planktivores fishes. A slight decrease in the quantitative indicators of benthos is possibly due to the methodological features of sampling and the underestimation of littoral communities. The composition and structure of benthic communities have been preserved since previous studies in the 50-90s of the last century. The ichthyofauna of Kroshnozero includes 13 fish species. Whitefish, zander, and vendace are fish of commercial importance. Fish of secondary importance are bream, perch, ruff, roach, and pike. Fish such as bleak, grayling sculpin, and burbot are relatively rare and do not serve as objects of fishing. Model calculations of fish productivity of planktivores, benthophages and predatory fish, taking into account losses to 2.3 kcal/m2 per season or 22.6 kg/ha. The average modelled ichthyomass is 4.6 kg/ha. Possible catches are one third of fish productivity equal to 7.5 kg/ha. To improve the quality and quantity of commercial stocks, recommendations are given to preserve the conditions for the reproduction and growth of valuable fish.

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Plankton and fish nutrition in African lakes

Cited by 2 publications

References 120 publications

Use of GIS‐based multicriteria evaluation for improved selection of suitable sites for cage fish farming in Mwanza Gulf, Lake Victoria

Use of GIS‐based multicriteria evaluation for improved selection of suitable sites for cage fish farming in Mwanza Gulf, Lake Victoria

Biological resources of Lake Kroshnozero (North-West of Russia)

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