Abobi, Seth, Kluger, Lotta and Wolff, Matthias (2021) Comparative assessment of food web structure and fisheries productivity of three reservoirs in Ghana. Fisheries Management and Ecology, 28 (6). pp. 573-591. DOI https://doi.org/10.1111/fme.12506.

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Abstract

Three Ghanaian reservoirs (Tono, Bontanga and Golinga) were compared through a food web modelling approach (Ecopath with Ecosim) to assess production character-istics 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 plan-ning and construction of adequately sized reservoirs used for fishery and irrigation purposes, the water budget (ratio of inflow and evaporation) needs to be estimated.

Document Type: Article
Programme Area: PA1
Research affiliation: Integrated Modelling > Resource Management
Refereed: Yes
Open Access Journal?: No
DOI etc.: https://doi.org/10.1111/fme.12506
ISSN: 0969-997X
Date Deposited: 07 Jun 2022 09:07
Last Modified: 07 Jun 2022 09:07
URI: http://cris.leibniz-zmt.de/id/eprint/4941

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