Blackfish, also known as black mullet, is a key aquaculture species in Tongzhou District, Nantong City, Jiangsu Province in the past three years. Due to the constraints of blackfish fry, it has affected the development of the blackfish breeding industry. In order to solve this bottleneck problem, the Tongzhou District Aquatic Technology Guidance Station of Nantong City and the Tongzhou District Yifan Aquatic Product Specialized Cooperative cooperated with the large-scale seedling breeding experiment of blackfish in Wuluo Town Lamuchang Village, and achieved good breeding results.
Test pond
(1) Tangkou conditions: The trial used the original crayfish culture ponds, with a total area of ​​56 mu and a total of 16 ponds, with an average of 3.5 mu per pond, both rectangular and east-west. Among them, there are 10 ponds with a perched platform in between. The pond area is After removing the platform, the depth of the silt in the pond does not exceed 10 cm, and the depth of the pool is 1.5 meters. The aquaculture pond is convenient for water intake and drainage. Each pond is equipped with a feeding bait machine. Adequate water, fresh water, no pollution.
(2) Cleaning and disinfecting: On June 13th, after the crayfish is caught, the pool water will be drained and 100 kg of lime will be used per acre. After the slurry is poured, the whole pool will be splashed to kill various pathogens and harmful organisms.
(3) Water quality cultivation: New water is injected on June 28th, and filtered with a double 80-mesh sieve. After entering the water, 0.5PPM chlorine dioxide was used per acre to disinfect the whole pool. After three days, the water quality was raised with 2 kg of fertilizer and water per acre.
2. Seed stocking
Choose healthy, disease-free and uniform quality seedlings. All the seedlings are sterilized with 3 to 5% salt water for 8 to 10 minutes before delivery.
3. Feeding of bait
After the stocks are stocked, the artificial domestication and feeding of feedstuffs must first be carried out. The specific method is to set one food table on one side of each pond, and the opening bait should be mainly based on No. 0 pellets (for black fish), and the fish should be Auxiliary, feeding 3 kg per acre per day, divided into three times early in the evening and feeding, feeding in the table side to take a fixed point to throw feed, after two weeks of domestication, blackfish seedlings will be able to actively emerge from the water for food; three weeks After that, use a pellet feeder to feed. During the whole culture period, the protein content of feed requires more than 36%, and according to the growth of fish, continuously adjust the particle size of the feed, suitable for palatability, daily feeding amount of 3 to 7% of the fish's body weight, feed feeding should be appropriate It is better to eat fish without surplus, to prevent pollution of water quality, and not to feed fodder.
4. Daily management
(1) Water quality regulation Keeping the pool water “fat, live, tender, and coolâ€, the transparency is generally kept at 25~30 cm, and the water depth is maintained at 1.2~1.5 meters. The lime is used to disinfect the water quality once a month, and the dosage per acre is 10~15 kg. Microbiological agents are often used to regulate water quality.
(2) Disease prevention and control of enemy enemies Disinfect the water body and the food table regularly, and feed baits such as allicin and three yellow powders in the hot season. Cover with a 3 cm mesh polyethylene mesh to prevent birds from swallowing.
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