Results on rearing of fingerlings of amur catfish Parasilurus asotus (Linnaeus, 1758) in conditions of warm-water farm

Data on size and sex composition are presented for broodstock of amur catfish, their spawning and the progeny rearing in a full-system warm-water farm are described. The juveniles were reared successively in the water tank, pond, and cages, and fed with alive and artificial granulated feeds. Two females weighing 1.95 and 3.10 kg and one male weighing 1.20 kg were selected for the spawning, their maturation was stimulated with extract of pituitary gland of carp. The females yielded 300 g of eggs with an unswollen egg weight of 3.3–3.5 mg. The eggs were dry inseminated and distributed throughout the artificial spawning grounds. The larvae hatched 69 hours after the onset of egg cleavage. Within 13 days after the larvae began active feeding, the weight of juveniles increased to 0.3 g, then they continued to grow in the pond where reached the mean weight of 112 g in two months, and further after 1.5 month of growing in the cages the weight of fingerlings increased on average to 220 g, with a wide range from 30 to 590 g. Cannibalism and aggressive behavior of juveniles were observed when they were reared in the tank and cages.