How much is the yield per mu of herring? To increase output, attention should be paid to the density of input and scientific management

In general, the average yield of cultivated herring is about 2000 jin per mu, and if it is cultivated with high density and large size, the yield per mu can reach about 4000 jin, and the specific yield is determined according to the size, density and culture of fish fry. If you want to increase the yield, you need to control the reasonable density during the culture period and maintain the appropriate water level in the fish pond. In the later stage, it is necessary to do a good job in disinfection and disease prevention of herring.

What is the yield of raising herring per mu?

Herring belongs to the species of high-density culture, and the yield of herring is closely related to the size, density and culture methods of fish fry. If you choose 3-5 jin of herring and put it in accordance with about 220pieces per mu, the yield per mu is about 2000 jin. If you choose 5-10 jin of finished fish, according to about 200 per mu, and then after scientific and reasonable culture methods, the yield per mu can be as high as 4000 jin.

How to increase the yield of herring

1. Water depth requirements

The water depth of many species of fish culture should not exceed 2 meters, and herring culture must increase the water depth, high-yield fish ponds generally maintain a water depth of about 2.5-3 meters, for high-density culture of herring, it is more necessary to increase the water depth to expand the range of activities for herring. Fish ponds are deeper and the bottom temperature is stable in winter, so it is more suitable for herring to survive.

II. Disease prevention and control

1. Fish pond cleaning and disinfection: 15 days before fish release in the fish pond, 180-230 g / m3 of quicklime or 3-5 g / m3 of trichloroisocyanuric acid can be sprinkled for disinfection. After drying the pond in winter, clean up the excess silt of the pond and make it frozen or exposed to cracks, then trim the perimeter of the pond and the drain.

2. Fish fry disinfection: soak the fry for about 5-10 minutes with 10-15 g / m3 potassium permanganate solution or 3% Rose 5% salt solution before stocking, and then slowly put the fry into the pond to prevent the fry from physical damage during transportation.

3. Feed disinfection: feed should be clean and fresh, fresh spiral clams can be selected and fed, green feed should be soaked in 3-5mg/L bleach solution for 20-30 minutes, and then mixed or sprayed with hepatobiliary rehabilitation agent and vitamin C to prevent herring hepatobiliary disease.

4, feeding farm disinfection: disinfect with bleach about 2 times a month, each time in 250 grams, to be dissolved in about 12.5 kilograms of water, and then sprinkle in the feeding ground, in the fish disease epidemic season to use medicine hanging bag prevention, each feeding farm can hang 3-6 bags, each containing 40-60 grams of bleach, once a day to change medicine, each time for 3 days.

5. Disinfection of fishing gear: the used fishing gear in the sick pond should be exposed to the sun for about 2 days, or soak in 10mg/L copper sulfate solution for 30 minutes, or soak in potassium permanganate solution with concentration of 300mg/L. When the herring is transported in separate ponds, it is necessary to avoid bruising and frostbite, so as to prevent water mildew.

III. Optimization of feed

1. In the process of herring culture, bean cake, wheat, corn, snail and so on are all good feed for herring, and the feed proportion should be controlled when feeding.

2. During the second-year-old fish period, highland barley feeds such as corn and wheat are mainly fed at about 7-9 o'clock in the morning, and then at about 4-7 o'clock in the afternoon. The daily feeding amount is 2% of the body weight of herring in the pond. 4% of the body weight. When feeding the feed, the highland barley feed can be put into the baiting machine, and some snails can be mixed. The ratio of highland barley feed to highland barley feed is 1:5. Make it fed evenly, so as to improve the quality and yield of herring.