What is a purple fish?
Herring is a kind of fish belonging to the genus Herring, also known as roe fish, mullet, mullet and so on. It is a high-quality economic fish in shallow water in warm areas, widely distributed in the Atlantic Ocean, Indian Ocean and Pacific Ocean. Mullet is slender, almost cylindrical in front and flat in the back. Generally, it is 20-40 cm long, covered with round scales, with a bluish-gray body, back and head, and a white abdomen, which is similar in appearance to barracuda.
The body of mullet is rod-shaped, the front is approximately cylindrical and the back is flat. The head is of medium size, the snout is short, the eyes are big, the body surface is covered with comb scales, and the lateral line is not obvious. Except the first dorsal fin, all fins have small round scales, 2 dorsal fins, 1 dorsal fin has 4 hard spines, the second dorsal fin is larger, the ventral fin is located, and the caudal fin is not obvious.
Mullet is widely distributed in temperate and tropical oceans such as Pacific Ocean, Indian Ocean, Atlantic Ocean, Mediterranean Sea and Black Sea, and in China, it is distributed in Bohai Sea, Yellow Sea, East China Sea and South China Sea. It is also one of the most important economic fish cultivated in salty and fresh water along the southern coast of China.
breeding technology
fish pond
Use idle or abandoned shrimp ponds to change them into ponds of 20-30 mu; Or choose an uncultivated pond and build a dike pond. There should be a water intake and drainage gate in the pond with a water depth of1.2-1.5m; It is best to have both tidal seawater and fresh water.
fish and chips
The stocking density of fingerlings should be adapted to local conditions according to the collocation of polyculture objects and the fatness of ponds, with mullet as the main body, with 5,000 ~15,000 mullet in 7 ~ 8 cm and about 0/0,000 mullet per hectare. Or 1.50g, 4,000-6,000 large mullet fish, with a proper amount of domestic fish (the stocking amount depends on the biomass of the pond bait); Fish ponds with freshwater fish culture and mullet polyculture are generally polyculture 1000 ~ 2000 mullet.
Tang Xun
Regularly observe the growth of mullet and seawall facilities, pay special attention to the quality of fresh water, and remove the residual bait and sewage garbage in the pond; By exchanging water with a mesh screen, invasive enemy fish (such as perch and mackerel, etc. ) can be prevented; In particular, we should guard against man-made incidents of stealing, poisoning and frying fish.
Fertilize soil or land
Generally, 200 kilograms of phosphate fertilizer and 225 kilograms of sulfate fertilizer are applied per hectare, once every half month. In addition, an appropriate amount of organic fertilizer, such as human and animal manure, should be applied every time. Under the condition of sufficient water source and reasonable stocking density, mullet can grow to 500 ~ 700g after 150 ~ 200 days.
baiting
Usually the bait is peanut cake, rice bran, wheat bran, distiller's grains and so on. Among them, rice bran and wheat bran are commonly used Peanut cake is not liked by fishermen because of its high nutritional content and high cost. Feeding frequency is once a day, and it is released in the morning. The feeding amount is generally 1% ~ 2% of the total weight of fish.
Flood control pool
At present, the pond culture of mullet adopts high-density culture in fat pond, and in daily management, fish often appear anoxic floating head, especially in hot weather season, which is prone to flooding. Therefore, it is necessary to patrol the pond frequently during the breeding process, especially when the air pressure is low in the morning. When the floating head is found, fresh water should be injected in time or the aerator should be opened to increase oxygen.