Asian Fisheries Society

The Development of Small Scale Hapa Culture of Tilapia (Oreochromis niloticus) in Northeastern Thailand I. Fish Density and Stocking Weight


The growth rate, feed conversion and net production of tilapia cultured in nylon hapas of 8 m3, was studied in Srisaket, northeastern Thailand. If fish densities were kept sufficiently low to maintain standing crops below the carrying capacity of the hapa, estimated at 25 kg, growth was significantly correlated to initial fish weight. Observed specific growth rates ranged from 2.60% at an initial weight (W0) of 18 g, to 0.55% at an initial weight of 264 g. The mean feed conversion ratio was 2.13, corresponding to a mean daily feeding level of 2.5% of fish body weight. A power function was fitted to the relation of the specific growth rate and the stocking weights and used to estimate net production for a hypothethical rearing period of 100 days. The recommended fish density is 32 fish•m-3 for a stocking weight of 25 g, reaching a harvest weight of about 100 g after 100 days. A second rearing cycle of 100 days at a stocking density of 13 fish•m-3 would be required to reach a market size of 234 g. For the hypothethical rearing period of 100 days, depending upon fish density, net hapa production would vary from 20.8 kg (W0 = 10 g) to 12.2 kg (W0 = 200 g).

Publication Date : 1991-11-01

Volume : 4

Issue : 3

Page : 307-316

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Date 1991/11/01
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