Measures of farmed grass carp to promote the fat gain of grass carp in autumn

Autumn is the peak season for grass carp to gain weight, and feeding during this period will increase production by about 30% compared with normal management. Specifically, the following measures should be taken:

First, adjust the water quality and add oxygen to the water. One is to add new water to increase the amount of dissolved oxygen in the water, generally adding new water 7 ~ 20 times a month, each time 1 hour ~ 2 hours, the amount of water accounts for 5% to 10% of the whole pool. The second is to sprinkle quicklime, which can not only increase calcium, but also disinfect and sterilize, usually once every 10 to 15 days, the pond with a water depth of 1 meter per mu is sprinkled twice with 15 kg ~ 20 kg of quicklime melted into slurry.

Second, improve the water quality and improve the environment. The autumn climate is the key period for the growth and development of grass carp. At this time, more fertilizer should be applied to cultivate water quality. Generally, pig and cow manure 300 kg ~ 400 kg per mu of water, or chamber urea 2.5 kg ~ 3 kg, superphosphate 4 kg ~ 4.5 kg, to ensure that fish have sufficient biological bait, in order to accelerate the accumulation of nutrients and maintain a good growth environment.

Third, feed concentrate to gain weight. The temperature dropped significantly in autumn, and the number of zooplankton and organisms in the water decreased. In order to meet the feeding needs of grass carp, we artificially made up for the lack of concentrate (made up of surplus rice, rice bran, wheat bran, soybean flour, peanut bran, etc.) and fed once a day. Daily concentrate accounts for 3% and 4% of the total feed. The new start in October should be appropriately increased to 5%-9% 0.

Fourth, feed the green material, match the thickness. Before feeding the concentrate, you should first feed the green feed, that is, grass, vegetables, etc., so as to be fresh, green and pollution-free. To achieve timing, quantitative, fixed point. Feed 3 snacks at a time to finish the latitude. In order to increase appetite, a variety of green materials can be fed in turn to promote rapid growth.

Fifth, observe frequently to prevent floating head. In autumn, for the fish ponds with high intensive culture density, due to the excessive amount of fertilizer, the content of organic matter in the water is high, the oxygen consumption factor is increased, and the fish activities are frequent. In order to avoid hypoxia floating head phenomenon, every morning, afternoon, especially at night, should often patrol the pond.

Sixth, prevent and cure fish diseases and grow and fatten up quickly. Large-sized grass carp in autumn, overeating, prone to enteritis and Gill rot, etc., can be used in the food field to hang baskets of bleach, 50 ~ 100 grams of bleach per basket, 100 ~ 150 grams of 95% crystal trichlorfon, 2 ~ 3 baskets per mu of water surface for 5 ~ 7 days, at the same time, the residue is fished out in time, and only metamorphic bait is used to feed the fish. In addition, we should also pay attention to eliminate snakes, algae and other enemy organisms in the pond so as not to cause damage and affect the fat development of grass carp.