EFFECT OF POLYCULTURE ON THE INTENSIVE FISH PRODUCTION UNDER CERTAIN ENVIRONMENT

Document Type : Research article

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Abstract

Five sp < /strong>ecies of fish were cultured separately in concrete ponds, 840 cubic meters of water per each with a water circulation system. Every species was stocked at a rate of 35000 fish seeds per pond. Sp < /strong>ecies involved were Oreochromis niloticus (0.niloticus), Common carp < /strong>, Mugel cephalus, Marone labrax and Chrysophrus auratus with, 28.0 + 0.3, 12.0 † 20, 30.5 $ 0.7, 1.1 + 0.1 and 1.3 + 0.1 initial body wights in grams for each species, respectively. Samples of the same species with the same initial body wights were stocked together at the rate of 7000 fish seeds per species giving a polyculture with stocking density of 35000 per pond. Feeding rate was 5% from the stocked biomass and corrected biweekly according to the recorded average weights using diet containing 26.57% crude protein. Biweekly samples (to about 1000 fish) were collected from each p < strong>ond, weighed and the average body weights were recorded and water samp < /strong>les were examined weekly for physico-chemical proporties... The results showed higher final average body weight, total production, net production and feed
conversion of polyculture than those of mono- et De culture under the same environment. The reverse was
true for survival rate in case of common carp.

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