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Now, the rouge has been artificially domesticated and kept in ponds. Rouge fish spawn every year from March to April, and the fifth-instar fish begin to mature but cannot reproduce naturally in ponds. The fry required for artificial breeding of carps can be obtained by artificial breeding. The capture of naturally mature broodstock, rearing in an artificial spawning pool, injection of oxytocin or salmon pituitary, can induce ovulation of the roach fish. And artificial insemination, so that the eggs fully fertilized, and then fertilized eggs hatch into the ring.
The embryonic development time of the rouge was slightly longer than that of the “Four Home Fishâ€. When the water temperature was 20°C, the fertilized eggs hatched in 6 days. The water temperature is higher and the hatching time is shorter. The newly hatched fry is about 0.7 cm in length, and after being raised for 1 week, it can grow up to 1.3 cm in length and can be reared in ponds. Juvenile young fish feed green algae, diatoms, algae, blue-green algae and other protozoa, aquatic oligochaites, cladocera, copepods, etc., also eat flour and other concentrate feed. During the holding period, cooked egg yolks can be fed. Before adult fish breeding, it is best to go through the seedling cultivation stage to grow small juvenile fish into 5 to 10 cm in length, which can increase the survival rate. The seedlings are cultivated in the same way as the "Four Home Fishes". The first is to sterilize the fish ponds, clear ponds, fertilize, fertilize plankton, and then put fish. The stocking density of fingerlings ranges from 10,000 to 20,000 per 667 square meters.
It is a benthic fish that feeds on benthic small animals and organic debris in sediments. It is most suitable for polyculture in ponds. In the village’s fertilizer ponds, there are more larvae of aquatic insects, ranging from 100 to 200 fish species per 667 square meters. Thiner ponds can also be mixed 50 to 100 tails. If there are fewer other benthic fish (carp, squid, etc.) in the pond, the stocking capacity can also be increased. In this way, it will not affect the yield of other farmed fish, and it can also collect dozens of kilograms of rouge fish. Rouge fish can also be polycultured in fingerling ponds and turtle ponds. If the feed is adequate, there is artificial compound feed, and primary care can also be considered. In the pond where the fish is kept, the water quality is required to be clear, cool and fat. Such ponds have more feed, and the amount of dissolved oxygen is sufficient. The fish rarely suffers from floating heads, the survival rate is high, the growth is rapid, and the yield is high. If properly managed, juveniles that grow in the same year can grow to 0.5 kg; generally 2 instars are 34 to 41 cm long and weigh 1 to 1.5 kg; 3 instars are 50 to 70 cm long and weigh 4 to 6.5 kg.
Bream fish breeding techniques
The fish (Myxocyprinus asiatius) is commonly known as a large-burning oyster, yellow row. It is a species of oyster-shaped head, nostrils. There are only 1 genera and 1 species in China; they are distributed in the dry and tributary streams of the Yangtze River and their affiliated lakes. The Lancang River in Fujian Province is also distributed. It is listed as a national Grade II protected animal. The rouge usually prefers to inhabit the middle and lower layers of rivers. It uses benthic invertebrates as the main food. It has the advantages of fast growth, large individuals, wide appetite, and delicious meat. It has ornamental value when juvenile fish are sold, and it is very popular in the international ornamental fish market. In the upper reaches of the Yangtze River is a major economic fish. The maximum weight captured was 10 kg.