Relative importance of various predators in Clarias gariepinus fry mortality in Cameroon

Sulem, S.Y. and Brummett, R.E. (2006) Relative importance of various predators in Clarias gariepinus fry mortality in Cameroon. Naga, Worldfish Center Quarterly, 29(3-4), pp. 74-77.

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Abstract

To estimate the relative importance of the most common predators of Clarias gariepinus fry, increasing levels of protection were afforded to exclude amphibians, aquatic arthropods and birds. At a stocking density of 10 larvae/sq.m. in nursing ponds, fencing off amphibians resulted in a 28 per cent decrease in mortality. Holding fry in hapas to protect them from both amphibians and aquatic arthropods decreased mortality by an insignificant 5.7 per cent. Installation of bird-netting over the hapas reduced mortality by 21.7 per cent. The remaining 4.9 per cent of total mortality, which could not be explained, was attributed to opportunistic cannibalism, disease and/or handling stress. Increasing stocking density to 40/sq. m. and, thus, reducing the food available per fry increased mortality by 28.3 per cent.

Item Type: Article
Title: Relative importance of various predators in Clarias gariepinus fry mortality in Cameroon
Personal Creator/Author:
CreatorsEmail
Sulem, S.Y.
Brummett, R.E.
Journal or Publication Title: Naga, Worldfish Center Quarterly
Volume: 29
Number: 3-4
Page Range: pp. 74-77
Date: 2006
ISSN: 1511-8533
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Fry; Mortality; Predators
Subjects: Aquaculture
Fisheries
Item ID: 9522
Depositing User: Mr William Ko
Date Deposited: 07 Oct 2012 14:57
Last Modified: 07 Oct 2012 14:57
URI: http://aquaticcommons.org/id/eprint/9522

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