Abstract
Abstract The growth of four species of carp – catla (Catla catla), mrigal (Cirrhinus mrigala), common carp (Cyprinus carpio), and rohu (Labeo rohita) – was compared among three feeding schemes: (1) exogenous introduction of zooplankton, (2) fertilization with manures, and (3) a control system with addition of boiled rice and mustard oil cake. Growth of fish was measured after 90 d in four separate tests conducted during September 1986–June 1987. Generally, frequency distributions of weight-groups of fishes at harvest were skewed toward larger fish in the live-food system and toward smaller fish in the control system. The instantaneous growth and net weight gain of fish were significantly higher in the live-food system than in the manured or control system. The better growth in the live-food system was attributed to a greater abundance of plankton and better water quality expressed in terms of lower values of chemical oxygen demand and higher concentrations of dissolved oxygen.
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