Some preliminary observations on catfish (Anarchicas lupus L. and A. minor Olafsen) in captivity
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Newly hatched catfish larvae have been start fed on commercial dry pellets with a survival rate of 60 % in the best group during the first 100 days after hatching. The specific growth rate has varied between 2.17 and 3.52 %/day in the first 137 days after hatching. Juvenile spotted catfish had an average specific growth rate of 1.0 %/day over a one year period. The results indicate a decrease in growth above 11ºC. The male gonads had a wet weight of about 2 g in May increasing to about 12 g in the spawning season (December/January), while the egg diameter in the female gonad increased from 1.0 mm in May to about 5.5 mm in the spawning season. Behaviour studies have been made on both larvae and adults and indicate that the fishes had their maximum activity around feeding time and spend most of the day laying on the bottom of the tanks. Cannibalism has been observed occasionally and only among juvenile fishes.