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Abstract
Fish compost was prepared using wastes of deep sea fish, Pricanthus hamrur, along with coffee husk as bulk material in a simple and less expensive method. The prepared fish compost was evaluated on growth and survival of Indian major carp, Labeo rohita, and production of both phytoplankton and zooplankton in 25 m3 cement cisterns. Juveniles of Labeo rohita (6.0 ± 0.35 g) were stocked @ 15 numbers/cistern. Two treatments with initial dosages of compost namely, 5 kg/cistern (2000 kg/ha), 2.5 kg/cistern (1000 kg/ha), and cattle dung @ 12.5 kg/cistern (5000 kg/ha), served as control in first installment. Subsequent monthly application of second and third installments was carried out with dosages of 1 kg/cistern (400 kg/ha) and 0.5 kg/cistern (200 kg/ha) in fish compost treatments and 2.5 kg (1000 kg/ha) of cattle dung (control). The fish were fed 30% protein diet at a rate of 5% of the fish biomass. Significantly higher growth (127.0 g) and survival (89.75%) of Labeo rohita were recorded in 2.5 and 0.5 kg fish compost treatment than in control and other treated group. Higher and sustained plankton production also was observed in compost treated tanks.