Relative Importance of Various Predators in Clarias gariepinus Fry Mortality in Cameroon

Sulem S.Y., R.E. Brummett and WorldFish Center

Naga, 2006, vol. 29, issue 3/4, 74-77

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/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/m▓ and, thus, reducing the food available per fry increased mortality by 28.3 per cent.

Keywords: Fry; Mortality; Predators (search for similar items in EconPapers)
JEL-codes: Q00 (search for similar items in EconPapers)
Date: 2006
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Persistent link: https://EconPapers.repec.org/RePEc:wfi:wfnaga:37135

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