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- Title
Comparative assessment of food web structure and fisheries productivity of three reservoirs in Ghana.
- Authors
Abobi, Seth Mensah; Kluger, Lotta Clara; Wolff, Matthias
- Abstract
Three Ghanaian reservoirs (Tono, Bontanga and Golinga) were compared through a food web modelling approach (Ecopath with Ecosim) to assess production characteristics and food web structures. The lakes differ in size and morphology, generating specific conditions for fish growth and production. While the two top fishery target species were Sarotherodon galilaeus (L.) and Oreochromis niloticus (L.) in all reservoirs, the mean trophic level of the catch was lowest in the largest and deepest reservoir (Tono) due to higher trophic level species occupying less accessible deep "refuge" habitats. The smallest lake had the highest fish production under optimal conditions of water supply (17.1 compared with 15.5 and 10.1 t/km2/year for lakes Bontanga and Tono), but it appears to be most vulnerable under conditions of drought. For the planning and construction of adequately sized reservoirs used for fishery and irrigation purposes, the water budget (ratio of inflow and evaporation) needs to be estimated.
- Subjects
GHANA; FOOD chains; FISHERIES; FISHERY products; NILE tilapia; FISH growth; WATER supply; ANIMAL products
- Publication
Fisheries Management & Ecology, 2021, Vol 28, Issue 6, p573
- ISSN
0969-997X
- Publication type
Article
- DOI
10.1111/fme.12506