Black herring is a blue fish, which is mainly distributed in the plain area south of the Yangtze River in China, but rarely seen in the north of the Yangtze River. It is an important fishery resource in the middle and lower reaches of the Yangtze River and lakes along the Yangtze River, and is the main breeding object of lakes and ponds. Four big fish? One. Below, I will share the breeding technology of herring for you, hoping to help you!
Pond condition
Choose a place with sufficient water, convenient irrigation and drainage, no pollution source, good ventilation and convenient transportation. Good water quality and transparency of 30-40cm.
Fish pond requirements:
Fish pond category area ㎡ water depth meter sediment silt thickness pond cleaning
Yumiaotang was cleared 5 days ago when the flat soil was less than 20 cm1~1.5.
1 age pool 2000 ~ 4000 1.5 ~ 2 < 30cm
The second-instar pond is 3500 ~ 5000 1.8 ~ 2.2 < 40cm.
Adult fish pond 5000 ~ 10000 2 ~ 2.5 < 40cm
A feeding field (or a feeding platform) should be designated for fish culture and adult fish culture ponds. The feeding field should be flat and free of silt and kept clean and hygienic all the year round.
Artificial seedling raising
Female parent fish with no injury, strong physique, soft abdomen, elasticity, reddish reproductive pores, a little slack, and feeling liquid when touching the abdomen, and male parent fish with milky semen flowing from the abdominal reproductive pores and scattered in the water were selected for artificial induction of labor. Oxytocin is LRH? Mixed injection of a+pg 0.6kg is effective.
Two injections, the first dose: 2 ~ 4 micrograms of LRH per kilogram of parent fish? 0. 1 ~ 0.2 PG was added to A, and the second injection dose was 15 ~ 20 μ g LRH? A plus 0.5 ~ 1 PG, the male dose is halved. The time between two stitches is 8 ~ 12 hours. When the water temperature is 25 ~ 27℃, the action time is 8 ~ 10 hour. Before the effective time 1 hour, the estrus dynamics of parent fish should be carefully observed and artificial insemination should be carried out in time.
Fish fry culture
Apply 6000-7000 kg/ha of green manure or 3000-4000 kg/ha of manure 5-7 days before sowing. Organic fertilizer should be fermented and decomposed, and disinfected with 1%-2% lime. After 2-3 days of fertilization, the water depth will be deepened to 0.5 m, and after 5 days, it will be deepened to 0.6-0.7 m, and a dense mesh net will be used when entering the water.
Feeding and management
Soymilk on the first day of 1 ~ 10 is 30kg/ ha in the first five days and 40kg/ ha in the last five days. After 10, it is increased as appropriate, twice a day, and evenly sprinkled in the whole pond. Add 15 ~ 20cm water every 5 ~ 7 days, and add it to the water depth 1.3 ~ 1.5m when summer flowers leave the pond. According to the water quality of the aquaculture pond, appropriate topdressing.
After about 25 days of cultivation, fry should be separated into pools, and 2 ~ 3 intensive exercises should be carried out before leaving the pool.
Fish stocking
Choose sunny windward place, spray film for 5 ~ 7 days, stocking density100 ~10.5 million strips/hectare, and pay attention to the temperature difference not exceeding 2℃.
Breeding of 1 year old fish
The stocking time is from summer to the day before, with 80 ~ 65438+100000 herring, 0/.8 ~ 20000 bighead carp and 5,000 crucian carp per hectare.
First, lure the herring to the table with a small amount of concentrate, and then feed the bean cake slurry twice a day, 2 ~ 3 kg/time. After 5cm, 10000 tails mixed with vegetable cakes, after 7cm, soaked with pickled vegetable cakes or bean cakes, and after 10cm, crushed river snails, starting at 30k g/ 10000 tails, and then gradually increasing.
When feeding? Four decisions? . Fixed point: feeding place, food table or food place; Schedule: twice a day, 8-9 am and 2-3 pm; Qualitative analysis: give high-quality fresh bait according to different growth stages; Quantification: each feeding is based on 1.5 hours, and the monthly feeding amount accounts for 4% in June, 23% in August, 25% in September, 10/5%,1655%. Food farms are often cleaned and disinfected to maintain hygiene. Water should be injected frequently to control moderate fertility and sufficient dissolved oxygen. Patrol the pond twice every morning and evening, observe carefully, arrange production according to the situation, and handle the diseases in time when they are found. Keep production records. When the temperature drops to 10 ~ 5℃, it should be taken out of the pond, merged into the pond and restocked. In winter, the density is 25g/m3. Change the water regularly and feed a small amount to keep quiet. The water depth is kept at 1.8 ~ 2m.
Cultivation of third-instar fingerlings
2nd instar fish species: 1.5 ~ 1.8/ 10,000 fish/hectare, 300,000 silver carp and bighead carp, 300 grass carp and 3,000 crucian carp/hectare.
Third-instar fish species: 5800 ~ 6200/ha, silver carp and bighead carp 300,000/ha, grass carp 300/ha and crucian carp 3000/ha.
Feeding is mainly animal bait, supplemented by plant bait, and compound bait can also be fed, and the bait should be fresh. In spring and autumn, digestible food should be appropriately increased, and the feeding area should be larger. Keep the water fresh, commonly use drugs to disinfect the market or use bait to prevent enteritis.
Adult fish culture
1. Breeding mode
The herring crosses the pond 1500 ~ 1700 fish/kg, and silver carp, crucian carp and grass are raised in the same pond.
4. Feeding management
Inject water once every 10 day, and keep the water depth 2m.
3. Other production measures refer to fish farming.
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