The hatching of catfish includes several forms such as pond hatching, watering hatching and flowing water hatching. The egg that is attached to the fish nest after natural spawning and artificial insemination can be hatched with a pond or hatched with water. After de-sticking, the eggs were hatched using running water.
1. Pond hatching: Usually hatching pond of salmon, and fry cultivation pond. Therefore, hatching ponds must meet the hatching requirements of catfish but also take into account the conditions required by the fry cultivation ponds.
The hatchery area is 2 to 3 mu, which requires fresh water. Thoroughly and thoroughly clear the pond before use to eliminate wild fish and predators. Lime clear pond, 50-75 kg of lime for each acre (water depth 10-15 cm). Use bleaching powder clear pond, with 1.5 to 2.5 kg per acre, after the dissolution Quanchiposa. After the toxicity of the drug disappears, the fish nest with the eggs is placed in the hatchery and the depth of the nest is checked and adjusted according to the weather conditions. Generally, 300,000 to 400,000 fish eggs are laid per acre, and approximately 150,000 to 200,000 fry can be hatched.
2. Drenching water hatching: In the indoor scaffolding, the fish nests are evenly hung on the rack, or bamboo curtains are placed on the racks to evenly lay the fish nests on the bamboo curtains.
Drenching water incubation requires stable indoor temperature, preferably between 20 and 25 °C. The water temperature of the shower should be approximately the same as the room temperature. Frequent watering, always keeping the fish nest moist, usually watering once every 30 minutes to 1 hour, the surface of fish eggs can not be dry. Drenching water for about 3 days. After the embryos have emerged, the fish nests will be transferred to the pond in time to continue hatching.
3. Flowing water hatching: After the de-sticking fish eggs or the fish nests with eggs, the running water can be hatched. Incubation tools include hatching cylinders, hatching barrels and hatching rings. Each cubic metre of water puts between 600,000 and 800,000 fish eggs. Because the fish eggs of the carp are small, the water swelling is small and the specific gravity is large, so the flow rate is larger than that of the incubating fish eggs. It is advisable to turn the eggs gently, and after the hatching of the fish, the flow rate should be reduced.
When the fry spots are obvious, they can emerge when swimming. After emerged, they are raised for several hours in a cradle and can be fed only after feeding.
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