Aspects of the biology of a tropical Cyprinid, Hampala macrolepidota (Van Hasselt), with reference to food, feeding habits and reproduction [Malaysia]
1986
Abidin, A.Z. (Pertanian Malaysia Univ., Serdang (Malaysia). Faculty of Fisheries and Marine Science)
A study on some aspects of the biology of Hampala macrolepidota (Van Hasselt) with emphasis on its food, feeding habits and reproduction was carried out at Zoo Negara Lake, Kuala Lumpur, Malaysia. The length-weight relationships of male and female adult fish are: Lo ge W = 3.144 Lo ge L-11.9034 and Lo ge W = 3.461 Lo ge L = 13.8770, respectively. The mouth and its action dentition, gill rakers, alimentary canal and stomach are described. The gape determines the size of prey eaten. Both juvenile and adult fish have similar gill raker selection. The relative gut indices of the juvenile and adult fish ranged from 1.20 to 1.02 which is typical of carnivorous species. Food analyses of the gut indicate that the food of adult fish is less than that of the juveniles and that they feed primarily on crustaceans and fishes. The analyses of the maturity stages, gonadosomatic indices and oocyte diameter patterns show that this fish is able to spawn throughout the year. However, physicochemical and environmental factors determine the actual spawning time. Spawning activity is associated with decreasing temperatures and day-lengths, rising water levels and increasing turbidities. Spawning is protracted and coincides with the rainy season which extends from November to March.
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