Metabolic rate and growth potential of various tilapias

Abstract
Tilapia species and their hybrids had MO2 s between 44.4 and 84.2 mg kg-0.8 d-1 at comparable temperatures. With one exeption (Oreachromis aureus .times. Sarotherodon galilaeus), the standard metabolic rate (SMR) tended to be higher than that of the purebred species. The scope for spontaneous activity (SSA) was a good measure of the energy available to the fish for body tissue synthesis. Using the amount of oxygen that is consumed above standard needs (SMR), theoretical growth potentials of 9.0 to 27.3 k kg-0.8 d-1 were derived. It is concluded that SSA may be used for selection of species for aquaculture.

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