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Fisheries Science

Observations on the balance in fish populations in a small reservoir in Ghana


This paper examines the fish populations in a small reservoir located in the coastal savanna to the east of Accra, Ghana, to evaluate their balance. The main forage fishes were the cichlid. Sarotherodon galilaeus (E value 88.2%), and the prawn, Macrohrachium vollenhovenii (E value 7.8%). The carnivores were represented by the catfish, Glorias senegalensis, and the cichlid, Hemichromis bimaculatus, with E values of 2.6 and 0.2%, respectively. The F/C and Y/C ratios were 34.92 and 1.79, respectively, which suggests unbalanced populations, presumably due to overcrowding by stunted forage fish, mainly S. galilaeus. The AT value of 50.81 % , however, might suggest balanced populations, but this index may have been over-estimated and the populations may be incapable of producing harvestable crops.


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Name of Author(s):
John Blay, Jr.
Institutional Affiliation:
Institute of Aquatic Biology (C.S.I.R.), P.O. Box 38, Achimota (Ghana)
Type of Publication:
Journal Article
Name of Publisher or Journal:
Fisheries Research
Date of Publication:
Number of Pages: