Culture techniques of wheat ear fish

Wheat ear fish is an important economic fish in our country. With the diversification of public consumption, fried wheat ear fish as a Doumei began to walk on the table. At the same time, with the gradual rise of domestic aquatic pets, the demand for high-quality bait fish is increasing. The market price is gradually rising, so it has a very high breeding value. Let's take a look at the breeding technology of wheat ear fish.

Seed and seedling selection

The fry of wheat ear fish are naturally caught from the surrounding lakes, requiring more than 5 mm in length, more than 3 grams in weight, more than 2 years old, good gonad maturity, strong physique, intact scales, disease-free, injury-free and parasite-free. Before stocking, the fish were disinfected with 35% salt water for 510 minutes, and the stocking density was 1000-1500 fish / mu.

Seedling cultivation

A pond with an area of 667 to 1330 square meters, a water depth of 1.2 to 1.5 meters and a bottom silt of less than 10 centimeters was selected as the cultivation pond. The whole pond was sprinkled with 75 kilograms of disinfectant per mu, and water was injected after 7 to 10 days. The aquatic plants were planted and the self-made compound feed and live bait were fed twice a day, once in the morning and once in the evening. The appropriate amount of feed for each time should be eaten within 2 hours. Timely adjust the feeding amount according to the situation of fish feeding, stop eating for one day when the fry is spawning, replenish and change water regularly, each time the amount of water is 2530% of the total pool water, and the gonadal development of fry is often checked during fry cultivation.

Seed and seedling management

From the end of March, we began to flush every 5 days for 34 hours to promote gonadal development. When the water temperature reached 10: 15 ℃, the maturity of wheat ear fish fry was checked. There is little difference in body shape between male and female fish in general, but there is an obvious difference in the breeding season. Mature male fish are large and dark in color, showing obvious accessory sexual characteristics in the kisses and cheeks, that is, white horny "pearl stars" and rough hands. Male fish can squeeze out milky semen. The female is small and light in color, often with a black longitudinal pattern on the side of the body, the oviposition tube is slightly protruding, the abdomen is dilated, there is an obvious outline of the ovary, the abdomen is soft, and the reproductive foramen is slightly red.

Induced labor technology

The spawning pond area of wheat spike fish culture is 50-60 square meters, the water depth is 0.6-0.8 meters, and the whole pond is disinfected with 75-100 kg disinfectant per mu in advance. The drug for inducing labor is ovulatory hormone 2 for fish, the dose is 1.52 μ g / g for female fish and 11.5 μ g / g for male fish. Artificial insemination can be carried out when it is found that male fish begin to chase female fish.

Artificial insemination

It was found that the effect time of inducing spawning was 12 hours. 12 hours after drug injection, the fish fry were caught, the eggs were collected by abdominal squeeze, the semen was collected by caesarean section, semen was collected by semi-dry method, and then aerated water was added and gently stirred with feathers for 23 minutes. Rest for 25 to 30 seconds, suck out the excess testicular tissue and other dirt, and put the fertilized eggs into the incubator for running water hatching.

Incubation technology

The hatching pond of barley fish culture is a round cement pond with a radius of 33.5 meters, which is disinfected by potassium permanganate in advance, and the bottom of the pond is covered with a circle of nano-porous pipe oxygen equipment, with a water depth of 50 to 60 centimeters, and the water used for hatching is ecological purification pool water filtered by 100-150 mesh yarn silk. The eggs were incubated in running water at a temperature of 20: 25 ℃, dissolved oxygen in the pool was not less than 6 mg / L, and water was changed to 1 / 2 every day. Disinfection drugs were used regularly.

Fish fry restocking

Before 7-10 days of stocking, the pond should be thoroughly cleaned and disinfected with quicklime, and then biological fertilizer should be applied to cultivate rotifers. The transparency of the pond water should be kept at 20-25 cm. Put 8 ~ 100000 summer flowers of wheat ear fish per mu and feed oil bran according to season, temperature and growth conditions, generally 1 ~ 3 times a day, after 3 ~ 5 months, it can reach the commodity specification of 120 ~ 160 fish per kilogram.

Feed feeding

Wheat ear fish is omnivorous fish, staple food zooplankton, can be fed with oil bran or self-made compound feed, feed formula is domestic fish meal 38%, rapeseed meal 21%, corn meal 12%, wheat meal 29%. Adhere to the principle of "four decisions and four looks". Normally, it is fed twice a day, and the feeding amount is about 5% of the body weight of the fish in the pond.