Black mullet is a valuable freshwater fish with high economic value, and is known as a treasure in fish. The mullet is delicious in flesh and nutritious. It has the characteristics of rapid growth, high yield, and good economic benefits. The artificial breeding time is 6 to 8 months. Each tail weighs more than 0.5 kg, and the mu yield can reach 2500 to 3,000 kg.
1, fish pond conditions
The size of ponds for raising mullet is generally 1 to 2 mu, which is suitable for management. The maximum size is not more than 3 mu. The water depth is 1 to 1.5 meters, and the bottom of the pool is preferably muddy. Adequate water sources, water quality should be neutral or slightly alkaline. 10 to 15 days before the stocking fry seedlings should be completely clear pond disinfection method can be divided into dry clear ponds and clear ponds, commonly used drugs lime. Dry clear pond disinfection, generally with 50 ~ 75 kg of lime per acre; with clear pond disinfection, water depth of 1 meter per acre of 125 to 150 kg. About 1/5 of the water in the pond or the water around the pond should be planted with 80-100 cm wide water-lilies, so that when the water temperature is high in summer, the sunlight will be shielded, which will not only help the mullet avoid the heat and hide, but also purify the water. It is conducive to the growth of mullet.
2, fish species stocking
Generally, 6000 to 8000 tails can be placed in the mussels. The seeds are required to be uniform in size and size, robust in physique, complete in scales, lively and normal swimming, and free from damage.
3, feeding technology
The mullet is a carnivorous fish, and the bait should be dominated by small trash fish. In the early stage of breeding, due to the small size of the mullet fry, wild fish of larger size should be chopped and fed to improve palatability. The daily feeding amount is generally about 5% of the total weight of the fish, and is adjusted depending on the food intake. The general feed weight ratio is about 1:4. Feeding should be timed, positioned, qualitative and quantitative. Feed once a day on the afternoon of the day and when the food is in full bloom, feed it once more in the evening. When feeding, the small scentfish are placed on a table suspended in the pool water to allow the fish to eat freely so as to reduce food waste.
4, daily management
(1) The patrol pool conducts a patrol of the pool one morning and evening each day. Careful observation of the feeding and activity of the fish species, paying attention to changes in water quality, and finding problems in time are handled.
(2) Change the water Note that new water is often added to keep the water fresh to promote the normal growth of black mullet.
(3) Anti-muckling black mullet seedlings were small in size at the beginning of stocking and had poor jumping ability. When the body length exceeded 10 cm, jumping ability gradually increased, especially in thunderstorm weather, when changing water, and in the early morning, jumping was very active. Escape fish easily. In general, the height from the water surface should be greater than 50 cm to prevent escape.
(4) 1 to 2 months before the rearing of the stocks should be promptly used to grow the net fast, individual large squid, and the other pool culture, as far as possible so that the size of the same fish breeding specifications, in order to avoid large individuals Eat small individuals.
(5) Although the disease-resistant mullet is resistant to disease and rarely develops disease, disease may also occur if high-density farming is not followed, if raising the breeding technology and management level is not done. Mainly hemorrhagic disease, symptoms: a significant reduction in food intake, diseased fish body surface showed massive or spotting bleeding, if not treated in time, will continue to die within 3 to 5 days. The treatment can be combined with oral administration and external use. Oral administration is based on 80 kg of fish blood weight per 100 kg of fish, and is fed once a day for 2 to 3 times; or every 100 kg of Yufuning. The weight of the fish was 30 grams per day, and the ingredients were fed once a day for 3 days. External use can be fish and shrimp enemy fungus, 250 grams per acre, or 200 grams of strong chlorine fine, Quantang splash, 1 day, 3 days for a course of treatment, the effect is good. Usually in the pond should be regularly with quicklime and other Quanchiposa disinfection prevention, to ensure the normal growth of mullet, in order to increase production and efficiency.
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