Abstract
ABSTRACT Channel catfish, Ictalurus punctatus, fingerlings (mean length: 4.0 ± 0.5 cm) were stocked into sixteen 16-rrP tanks with cement walls and earth bottoms. Four stocking densities were used: 10, IS, 20, and 25 fish/m2. Fish were fed a prepared diet containing 36% protein according to a fish size/water temperature-dependant chart for 120 days. Fish were stocked on January 20, 1992. Average water temperature varied from 19.7°C to 28.5°C. Final mean values of individual fish length and weight were significantly higher (P< 0.05) for the density of 10 fish/m2 and averaged 19.4 ± 2.6 cm and 70.0 ± 16.9 g, respectively. Food conversion ratio was significantly higher (P< 0.05) for fish stocked at rate of 25 fish/m2 Survival rates averaged 91.4%, with no significant differences (P >0.05) found among treatments. These results demonstrate the viability of channel catfish fingerling growth in southern Brazil.
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