HATCHERY PHASE IN FINGERLINGS PRODUCTION

Hatchery Phase Hatcheries used to produce catfish fry are simple facilities that use flow-through tanks holding about 90 to 100 gallons of water for egg
incubation and fry rearing. The
most critical factor for a successful hatchery is a dependable supply of high-quality water. Egg hatching tanks are equipped
with a series of paddles spaced
along the length of the tank to
allow wire-mesh baskets to fit
between them. One or two egg
masses are placed in each basket and the paddles gently rotate
through the water to provide
water circulation and aeration. The incubation time varies from 5 to 8 days depending upon water
temperature. At hatching, the fry (called sac-fry at this point) fall or swim through the wire-mesh basket and school in tight groups. Sac-fry are siphoned into a bucket and transferred to a fry rearing tank. Aeration in fry rearing tanks is provided by surface agitators or by air bubbled through airstones. Initially, sac-fry are not fed because they derive nourishment from the attached yolk sac. Over a 3- to 5-day period after hatching they absorb the yolk sac and turn black. At that time fry (now called swim-up fry) swim to the water surface seeking food. Swim-up fry must be fed 6 to 12 times a day for good survival and growth. Fry are fed nutritionally complete feed for 2 to 7 days before they are transferred to a nursery pond.FOR CONSULTANCY CALL 08032861326.

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