Desalination treatment spring stocking benefit fresh water pond culture method of sea perch with high benefit

Sea bass, also known as sea bass, is a carnivorous fish with delicate meat and rich nutrition. The suitable temperature for culture is 3 ℃ ~ 29 ℃, and the most suitable water temperature is 16 ℃ ~ 27 ℃. It can survive the winter naturally. It is a widely saline fish. After desalination treatment, the fry of Lateolabrax japonicus were reared in spring with a size of about 10cm. After 5 months, the body weight could reach 400g ~ 500g and the yield per mu was about 500kg. The following is a brief introduction to the key techniques of sea bass culture in freshwater ponds.

Sea bass

1. Pond conditions. The suitable area of sea bass adult fish culture pond is 1 mu ~ 5 mu, sandy loam bottom, less silt, flat bottom, slightly inclined to the outlet, water depth of 1.5 meters, perfect drainage and irrigation system, sufficient water source, fresh and pollution-free, and good water quality. The pond was exposed to the sun in the dry pond, about 10cm was released 10 ~ 15 days before stocking, 80kg ~ 100kg of quicklime was used per mu, and 5kg of bleach was added the next day, and the chemical water was sprinkled throughout the pond.

two。 Bait feeding. Sea bass has strong predation and can be fed with surimi or chilled small miscellaneous fish or wild mixed fish meat. After domestication, it can be fed with pellet feed. Before throwing, pour a few water to form a conditioned reflex, and then throw pellet feed, after several times of adjustment, as long as you hear the sound of splashing water, sea bass will swim in groups to feed. Choose the place in the middle, use bamboo and wood springboard to reach into the water surface of the pool, 6 ~ 7 meters away from the pool bank, and set up a feeding point. Such a feeding point, bait casting area is large, fish feeding, not easy to mix water, and can accommodate more fish uniform feeding. Daily feeding amount: when the fish body is small in the early stage, it can be fed according to 8%-15% of the fish weight, 3-5 times a day, and 3%-5% of the fish body weight twice a day as the fish grows up. The feeding amount should be adjusted in time according to the feeding and growth of the fish. According to the habit that sea bass do not like bright light, they eat vigorously at sunrise and sunset, and hardly eat at noon, so they should be fed twice in the morning and evening. When casting, you should grasp the principle of "slow, fast, and slow". At the beginning, cast less, lure the fish to gather, then cast quickly, and expand the bait area in time, so that the schools of fish are evenly full, wait for the fish to eat quickly, and then throw less after the food grab is not intense. Feed until most of the fish leave the feeding point. Generally, it is fed for about half an hour at a time to prevent bait from sinking to the bottom, waste and pollute the water.

3. Seeding and stocking. After desalination treatment, the adult length of sea perch is about 10cm, and then put into the pond for adult fish culture, the survival rate is high. The stocking specifications should be neat to avoid eating each other, and the stocking density should be 1000 ~ 1500 per mu, and 40 large bighead carp, 20 silver carp and 200 Pengze crucian carp should be cultured at the same time, so as to make full use of the water body, regulate the water quality and increase the yield.

4. Water quality regulation. Sea bass is a benthic fish, which likes to live in clean water with high dissolved oxygen (4 mg ~ 6 mg / L) and transparency in 30cm~40cm. In the process of adult fish culture, new water should be added flexibly and timely according to water color and transparency. In the early stage, because the fish is small, the temperature is low, and the water quality is easy to be controlled, the cycle of adding and changing water can be longer. With the growth of fish and the increase of biomass in fishing ponds, the ponds should be inspected frequently, new water should be injected frequently, and aerators should be used reasonably to increase oxygen. The temperature from September to October is suitable, which is the stage of rapid fattening of sea bass, and the regulation of water quality should not be ignored.

5. Fishing. Sea bass is very easy to catch, and the sea bass cultured in ponds can catch more than 90% of the adult fish after pulling the net twice. But we should pay attention to two points: first, before pulling the net, we should stop baiting for 1 day, because the stomach capacity of the full fish is large, after being hit by other fish, it is very easy to cause injury; second, the bass is ferocious, and when pulling the net, it is easy to be bruised and stabbed each other, so when pulling the net, try to choose a small net to catch fish, take fish according to quantity, and try not to pull the net in the whole pond. When lifting the net, make sure that the net does not leave the water, and segment the fish in the net without leaving the water, so that the unsold commercial fish or the caught commercial fish will be less damaged. The pond pulled through the net should be disinfected once to prevent water mildew.