Evaluation of production performance of carp in a lentic freshwater sewage-fed polyculture pond

Results of composite fish culture operations in three tier systems conducted in a sewage-fed fish farm in Bandipore, North 24-Parganas, West Bengal are presented. Fish culture was carried out using four species combination of rohu, catla, mrigal and silver carp in first and third phases and five species combination of rohu, catla, mrigal, silver carp and common carp in the second phase. The gross production offish was 924.56 kg/ha/90 days in phase-1,1116.68 kg/ha/BS days in phase-II and 1691.63 kg/ha/90 days in phase-Ill with stocking densitites of 20,000, 25,000 and 15,000 per hectare respectively. Silver carp registered maximum daily growth performance (0.718 + 0.398 g to 2.109 + 0.081 g) followed by mrigal (0.653 + 0.098 g to 1.075 ± 0.101 g), rohu (0.466 ± 0.11 g to 0.984 ± 0.099 g), catla (0.341 + 0.102 g to 0.997+0.11 g) and common carp (0.385 ± 0.022 g). A critical analysis is made on production potentialities on the waste water impoundment in respect of stocking densities, species combinations and management procedures