The price and culture method of black fish fingerling

Black fish is a common edible fish in China, with few bone spurs, high meat content and rich nutrition. as early as 2000 years ago, it was listed as the top grade of insect and fish by Shennong Materia Medica Classic and stone honey, bees, beeswax (propolis), oysters, tortoise shells, mulberry tick octopus, sea clams, clams, carp and so on. Let's take a look at the price of black fish seedlings and breeding methods.

How much is the black fish fry?

The price of black fish fry varies with different varieties and specifications, usually about 0.1-0.5 yuan per fry. The age of sexual maturity of black fish varies slightly in different areas, and can reproduce naturally in ponds, ditches and reservoirs. Spawning grounds are generally distributed in shallow water areas with lush aquatic plants. The number of eggs and the number of eggs laid are related to the individual size of their parents. Usually, the number of eggs per kilogram of body weight is about 20 ~ 30 000 eggs, the number of eggs laid by 0.5kg black fish is generally 80 ~ 10 000 eggs, and some of them can reach 1.1 ~ 12000 eggs.

Artificial propagation of black fish

The main results are as follows: 1. Parent fish selection: the quality of black fish parent fish is the key factor of artificial reproduction, and it is more suitable for individuals whose age is more than 2 years old and weight is 500-1500 grams. Parent fish that have reached sexual maturity, disease-free, disease-free, large and good growth performance should be selected.

2. Male and female identification: black fish have no obvious difference in secondary sexual characteristics, and it is difficult to distinguish male and female in appearance, but in reproductive season, the abdomen of female fish is dilated and soft, the reproductive pore is slightly reddish, and the abdomen is grayish white. The abdomen of male fish is smaller than that of female fish, and the reproductive pore is slightly concave.

3, parent fish pairing: black fish parent fish are paired according to 1:1 proportion and put directly into the spawning pond to wait for natural spawning. The suitable spawning pool area is 0.1-3mu, and the best bottom is 1m deep and 0.3m shallow. Grass is planted or thrown in the pond, the transparency is greater and the lean water is better.

4. Artificial induction of labor: the artificial induction of labor of black fish should choose the degree of gonadal development at the end of Ⅳ, the water temperature is 25-28 ℃, and the general time is from late May to mid-June. Chorionic gonadotropin and pituitary gland of carp have better effect.

5. Artificial hatching: after spawning and fertilizing in the spawning pond, the parent black fish can be fished out with a small fishing net on a fish plate and concentrated in the incubator or other containers to hatch. Generally put 500 pieces in the basin, 5000-8000 pieces in the large plastic basin and 10,000-20,000 pieces per square meter in the small net cage.

6. Fish fry cultivation: black fish eggs can hatch after 2 to 3 days, and live water fleas should be fed immediately after 4 or 5 days of yolk absorption. The fish yellowed after feeding for 5-6 days, with a total length of about 1.5 cm, can be moved to a small pond for cultivation.

Culture methods of black fish

1. Fish pond selection: the black fish pond requires ventilation to the sun, sufficient water source, an area of 1 mu, a water depth of 1 mu and a water depth of 1 to 1.5 meters. Some water floating lotus or water peanuts are planted all around, and surrounded by nets in lower places, which can not only prevent mullet from escaping, but also can be hidden and shaded.

2. Pond cleaning and disinfection: after the black fish pond is selected, drain the pond water first, use 140-150 kg quicklime per mu, sprinkle the whole pond evenly, and turn over the silt with rakes and other tools to fully disinfect the pond. One week before stocking, the pond water is injected to a depth of 1 meter and appropriate base fertilizer is applied to improve the water quality.

3. Fish stocking: there are generally two sources of black fish, one is wild, the other is artificial breeding, but before going into the pond, the species with basically the same specifications should be bathed in 35% salt water for 5 minutes for 10 minutes, and then put into the same fish pond.

4. Stocking density: the stocking density of black fish depends on the source of water, the conditions of injection and drainage, the source of bait fish, etc. Under normal circumstances, there are 6000 million black fish per mu in 3 cm, 4000 000 fish in 10 cm long mu, and about 2000 fish in 20 cm mu.

5. Feed selection: black fish feed uses powdered feed produced by regular units, with a crude protein content of 45% and crude fiber of 3%. The raw materials are premixed with fish meal, bone meal, soybean meal, flour, vitamins and minerals, supplemented with fresh bait such as clam meat and small fish.

6. Bait feeding: black fish should be domesticated after entering the pond. After the black fish are used to eating dead bait, they are fed once at 9: 00 a.m. and 4: 00 p.m., and the daily feeding amount is 5: 10% of the fish's body weight. And according to the weather, water temperature, growth, feeding and other conditions flexibly.

7. Daily management: under the condition of artificial intensive culture, if the prevention and control measures are proper, the disease is rarely or not sick, so in the process of black fish culture, the water quality, fish situation, salvage of residual bait, prevention of escape, etc., should be checked frequently, and abnormal situations should be dealt with in time.

8. Timely fishing: black fish are ferocious carnivorous fish, which will kill each other when the bait is insufficient, so they should be caught once every month or so. If the specifications vary greatly and the quantity is large, it can be cultured in other fish ponds or cages of the same specification.