Culture Techniques of Wuchang Fish

Fry reproduction

The head of a raccoon head is 2 to 3 years old and matures. The breeding season is slightly later than that of pupa and squid, and it is earlier than the family fish. The middle and lower reaches of the Yangtze River are mostly from the end of April to the beginning of June, that is, the water temperature is in the oviposition period in the period of 20-29°C. In lakes, spawning occurs in places where aquatic plants thrive, and fertilized eggs are sticky and attached to aquatic grass or other objects. Pond-breeding broodstock broodstock can cause sparse natural spawning during the breeding season if micro-flowing water or other conditions stimulate it. Therefore, after the spring of each year, the male and female broodstock will be bred separately, and artificial aphrodisiac will be sent out, and the animals will be collectively propagated in batches to produce fry.
Artificial breeding of fry, can take natural spawning or artificial ovulation method. Breeding broodstock is best cultivated in ponds for a period of one year, and can also be picked directly from natural water bodies. The identification of male and female head lice is relatively easy. From the fingerling stage, the first ray of the female pectoral fin is thin and straight, and the thickness of the male fish is “wavy”. After sexual maturity, the back of the first few rays of the pectoral fins of the male fins and the dorsal and ventral edges of the caudal peduncle have dense "stars". They feel rough with their hands and have a small abdomen. Semen flowed out; females had only a few "stars" on the orbital bone and back, and the abdomen was enlarged and soft. The mature broodstock can be selected when breeding, and the broodstock can be integrated into the spawning pool as planned, or the hormone can be used for artificial oxytocin production to allow natural spawning and insemination. Due to the stickiness of the eggs of the head squid, the eggs can be attached to artificial nests and then hatched in still water. It is also possible to artificially inseminate fertilized eggs and detaste the fertilized eggs before artificial hatching. Its breeding process and operating methods are basically the same as those of squid.

Seed cultivation

The head of the scorpionfish is delicate and tender, so be careful when handling it. When the fish is under the pond, the water quality should not be too fat, and it should not be too crowded when counting out. Fry to develop spring-slice fish species, often using a graded feeding method.
Two to three days after hatching, the fry gradually freed itself from the broodstock and started feeding on small zooplankton. Therefore, when the fry is in the pool, apply fertilizer daily. De-stick hatching fry, mu 12 to 150,000 tail is appropriate. When the fry open feeding, it is best to feed 1 to 2 times cooked egg yolk, and then feed a few days soy milk, later depending on the water quality of fat and fry growth and determine the amount of fertilizer. After 15 to 20 days of feeding, fry can grow to 2 to 3 cm.
The second time pooling, acre put 40,000 to 50,000 tail fire fish species, cultivated mainly plankton for fertilization, and at the same time, it can feed bean cake slurry every other day, but also add some calabash, duckweed and other plants. feed. After a month or so, summer flowers of 4 to 5 cm in size can be cultivated, and the survival rate can reach 80%.
From the summer flowers to develop winter fish species, that is, the third-level feeding. The method is basically the same as the cultivation of grass carp. The transparency of the pool water is generally maintained at about 30 cm. Stocking densities generally range from 5000 to 7,000 acre per mu, with 10 to 20% of cockroaches, cockroaches, and herringbone summer flowers. It is also possible to store 10 to 20% of the head lice in the main oysters and squid pools. In the early days of Tangxia, they were fed with calabash, duckweed, and bean cake, and later fed with purple duckweed, black leaf algae, or chopped fresh dry grass. When entering the winter, it usually grows to 12-15 cm, and the survival rate can reach more than 90%. The second year to develop fish.

Adult fish rearing

Breeding methods include pond breeding or polyculture. They are extensively reared on the lush lake banks of aquatic plants, and are intensively cultured using cages.
The main supporting group of head lice, in the depth of 1.5 to 2 meters in the pond, per acre can be placed in winter fish fillets 600 to 800, with oysters, bream species of 200 to 300, breeding a year head lice individual up to 500 Grams around. Its growth rate is faster before the third instar. Gradually slow down later. The head food of C. edulis is similar to that of grass carp, so it can economically utilize the feed resources in natural waters, and at the same time, it can also consume artificial feed to promote the growth of adult fish. The head of the test pond of the experimental pond in Wuhan City had a good effect. The method was as follows: 1220 T. agaveus overwintering species weighing 40 grams per mu, 200 species of white bream with a tail weight of 50 grams, and tail weight. 60 grams of flower carp species 30, but also appropriate to put some high-backed species of fish, the use of "Zhengda" No. 083 feed, the feed prime 1.8, when feeding uniform. Usually pay attention to water quality management to prevent deterioration of the water quality and flooding ponds, and the dissolved oxygen in the water in the room is not less than 2 mg/l. At the end of the year, 500 kilograms of output per mu were obtained, including 350 kg of head locusts and an average tail weight of 0.35 kg.

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