Artificial breeding of scorpionhead bream

The group head carp, also known as Wuchang fish, is a herbivorous fish that grows fast and adaptable. The meat is delicate, delicious and nutritious and is loved by consumers. Its artificial reproduction includes several stages such as broodstock breeding, drug eliciting and artificial hatching.
Broodstock Breeding In lakes, reservoirs or ponds, it is advisable to keep individuals aged over 3 years with a healthy body and complete scales and fins as broodstock, and put them into broodstock ponds, which can also be selected from fingerlings. . When selecting broodstock, attention should be paid to the proportion of males and females, requiring a slightly greater number of males than females, and the ratio of male to female is generally 1:2.2 to 1:1.5. The broodstock collected in the spring of the year can generally be matured through short-term cultivation. Regardless of the size of the fish pond, good results can be achieved with either single breeding or ration. The area of ​​the cultivation pond is generally about 1 mu, the water depth is 1.2 meters, and 100 to 150 kg of head fish can be stocked, and 4 to 6 squid broodstock are properly stocked to regulate water quality. In early spring, the head squid broodstock passed through the winter, the body weight decreased slightly, and when the green feed is still very little, it should mainly feed the concentrate feed, so that the fish body as soon as possible to restore fat. After other aquatic plants and landgrass grow, they must gradually feed green feed. At this time, the proportion of concentrate feed and green feed is approximately 1:1.6. 15 to 20 days before oxytocin, the concentrate feed is stopped and the concentrate feed is bean cake, malt, etc. The green feed is Vallisneria, black leaf irrigation, lettuce leaf and so on. The feed rate of green feed is 4 to 6 hours per day. For each broodstock, the maximum amount of concentrate feed is 25 to 30 grams per day. The pool should be filled with fresh water to promote the development of the gonadal of the fish. In the period of approaching spawning, when the water temperature reaches 16°C to 17°C, the male and female fish should be separated to avoid sporadic production of the broodstock and affect the normal production.
Progeny fish oxytocin production in the production, the general use of drugs to mobilize reproduction, to select well-developed broodstock injection oxytocic agents. The types of oxytocin mainly include salmon, carp pituitary, chorionic hormone and LRH-A. The amount of pituitary gland is better for females with 6-8 mg per kilogram of body weight. The chorion is better for 600 international units. The LRH-A is better for 60-100 micrograms and the male is halved. A thoracic injection method is generally used for oxytocin production. When the water temperature is between 24°C and 26°C, the effect time is about 8 hours.
After hatching and de-sticking, the headed squid eggs can be hatched in an incubating tank with an egg density of 500,000 to 1 million grains per 100 kilograms of water, and can also be hatched in a hatching ring, with an egg density of one cubic meter per cubic meter. The rice has 700,000 to 800,000 grains. Because the volume of eggs is small and the specific gravity is large, the water flow should be larger than the hatching water of grass carp eggs and salmon eggs to prevent it from sinking to death. Normal water temperature at 25 °C ~ 26 °C, 1 to 2 days to hatch, 4 to 5 days after the film grows to 6 ~ 6.5 mm when the waist point, you can emerge the number of seedlings, pond breeding or Sinotrans.

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