Preliminary observations on the feeding, habits and reproduction biology of Gymnarchus niloticus from Lake Chad

Sagua, V.O. (1986) Preliminary observations on the feeding, habits and reproduction biology of Gymnarchus niloticus from Lake Chad. In: 3rd Annual Conference of the Fisheries Society of Nigeria (FISON) , 22-25 February, 1983 ,Maiduguri, Nigeria, pp. 179-182.

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Abstract

The preliminary results obtained from the study of stomach contents of specimens of Gymnarchus niloticus of a size ranging from 56 cm (66 grams) to 152 cm (12.0 kg.) from August to December, 1982 indicate for these sizes an exclusively piscivorous diet. The predominant prey species in Lake Chad are Tilapia/Sarotherodon , and Clarias . The prey is often cut in two parts before it is swallowed. Small prey may be swallowed whole. The implication of this prey capture method on prey-predator relationship and therefore the impact of the predator is discussed. The breeding season of Gymnarchus niloticus in Lake Chad has been deduced from observation of changes in gonad maturity stages and the results indicate that breeding takes place between August and November. Data are also presented on the fecundity, size of ripe eggs and probable size at maturity

Item Type: Conference or Workshop Item
Title: Preliminary observations on the feeding, habits and reproduction biology of Gymnarchus niloticus from Lake Chad
Personal Creator/Author:
CreatorsEmail
Sagua, V.O.
Page Range: pp. 179-182
Date: 1986
Event Title: 3rd Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Maiduguri, Nigeria
Event Dates: 22-25 February, 1983
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria, Lake Chad; diets; stomach content; Gymnarchus niloticus;
Subjects: Fisheries
Biology
Item ID: 3440
Depositing User: Ms Maria Kalentsits
Date Deposited: 28 May 2010 19:20
Last Modified: 29 Sep 2011 17:24
Related URLs:
URI: http://aquaticcommons.org/id/eprint/3440

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