Cultivation techniques of larvae and juveniles cultured in hard head bream
(a) cultivating larvae
It takes about 1 month to raise larvae to juveniles. This stage is the key stage for the survival rate of cold-water fish, such as the hard-headed oystercatcher. A slight oversight may preclude work.
The larvae rely on the yolk sac nutrition and development in the early stage. When the water temperature is about 10°C, the larvae begin to float after two weeks of development. When the float rate of the larvae in the hatching water reaches 50%, it is necessary to feed in time, forcing the floating larvae to ingest nutrients from the outside. The specific method is: using egg yolk and skim milk powder to form a slurry and evenly spilled into the body of water. Feeding 8-10 times a day. Feeding more than the number of bait larvae per 100,000 per day feeding egg yolk is appropriate, milk powder is about 50 grams is appropriate. Because the larvae are floating, pay attention to preventing escape and controlling the flow of water.
(b) Juvenile culture
After all the larvae have floated, they will enter the juvenile culture stage. At this stage, the key lies in feeding. The key to feeding is the palatability, nutritive, and attractant properties of the mouth-opening bait. The dietary requirements of open bait: The content of crude protein mainly based on animal protein is more than 50%, crude fat content is 15%, and it is supplemented with multivitamin additives for juvenile fish. There are four kinds of small-to-large grain feeds, namely 0.32, 0.42, 0.63, and 1.0 mm. Feeding should be no less than 6-8 times a day.
For the cleanliness of the pool and the health of the juveniles, the sludge at the bottom of the pool must be completely removed once a day. Disease prevention generally adopts drug soaking and feeding methods.
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