Is grass carp afraid of cold?

Grass carp has strong cold tolerance and can grow in water at 5℃, with a growth temperature of 5 ~ 38℃ and a suitable growth temperature of 20 ~ 35℃. Although grass

Grass carp has strong cold tolerance and can grow in water at 5℃, with a growth temperature of 5 ~ 38℃ and a suitable growth temperature of 20 ~ 35℃. Although grass carp can survive in the water temperature of 5℃, the food intake is obviously reduced when the water temperature is lower than 20℃, and it is vigorous when the water temperature is 27-30℃. Therefore, grass carp culture needs to do a good job in site selection, pond construction, fry stocking, feeding management and water quality control.

1. Is grass carp afraid of cold?

Grass carp has strong cold tolerance and can grow in water at 5℃, with a growth temperature of 5 ~ 38℃ and a suitable growth temperature of 20 ~ 35℃. Although grass carp can survive in the water temperature of 5℃, when the water temperature is lower than 20℃, its food intake is obviously reduced, and the water temperature is between 27℃ and 30℃. C, the appetite is strong.

Second, grass carp culture technology

1, site selection and pool construction

(1) The plot with sufficient water and clean and pollution-free water quality should be selected for the aquaculture pond, and the pond area should be controlled according to the aquaculture scale. The water depth should be about 2 meters, and the thickness of silt at the bottom of the pond should be about 18 cm.

(2) Do a good job of cleaning the pond in autumn and winter. Drain the pool and let it dry for about 3 weeks. Before stocking for about half a month, fill the pond with water to 15cm, and sprinkle quicklime on the whole pond for disinfection.

(3) Each acre of pond should be equipped with an aerator and a water pump, so as to change water and aerate in time.

2, fried stockings

(1) Free-range fish fry can be mixed with crucian carp and other fish, thus improving the culture efficiency.

(2) Before stocking, fry should be disinfected to avoid carrying germs and affecting fish growth. Put the fry in salt water for about 8 minutes.

(3) Pay attention to keeping the stocking ratio of grass carp above 80%, and the number of other mixed fish farming should not be too much, so as not to rob grass carp of feed and affect its growth.

3. Feeding management

(1) Grass carp feed is mainly pellet feed, but the size of pellet feed should be controlled according to the size of grass carp.

(2) The protein bait of feed should be controlled at about 30% and fed with green feed.

(3) Feed the bait regularly, quantitatively and at fixed points, about twice a day. It is not advisable to feed the same feed for a long time. After feeding pellet feed for 2 weeks, it is necessary to stop feeding and switch to raw grain 1 week.

4. Adjust water quality

(1) Aerobic work should be carried out regularly every day, usually about 2 days in the afternoon, and try to increase oxygen at night. In case of long-term rainy weather, it is necessary to strengthen aerobic work.

(2) Change the pool water regularly to ensure the water quality is clean. When changing water, drain some water first, and then inject new water.

(3) Pay attention to the need to control the frequency of water change according to the change of festivals. It needs to be injected every 4 days in summer, and each injection is about 12 cm.