Technical measures for winter fish species
The winter fish species not only increase the survival rate, but also promote early spring production, so that the fish can gain weight quickly and gain early profits, increasing income by 40% to 50%. Its main technical measures are:
First, the pond "five changes." That is to say, small changes are big, shallow changes are deep, death (water) is changed to live (water), leakage (water) is changed to security (water), and grab (risk) is changed to defense (flood). If conditions permit, it is better to build high-quality fish ponds to ensure good fish breeding facilities.
Second, clear pond disinfection. Should be carried out on a sunny day. There are two ways to clear the pond: First, the dry clear pond (reserved 10 cm deep), that is, apply 80 to 100 kg of lime per acre, or apply 4 to 5 kg of bleach containing 30% of available chlorine. two
It is a clear pond with water (1m deep water), that is, 150kg of quick lime per acre or 12kg of bleach containing 30% of available chlorine, plus a water-sprinkling sprinkling pool. After clearing the pond for 7 days, the fish can be released.
Third, fat underwater pond. Shiji Fei after the clear pond, Mushi 250 to 500 kilograms of human and animal dung (new ponds can be applied more, fertilizer ponds can be less or not applied). After fertilization, winter water is poured to cultivate natural food.
Fourth, appropriate early release. From the winter solstice to the Spring Festival, it is a good season for stocking. The so-called “was water stocking and fish species grow.†At this time, the water quality is stable, the fish body is strong, the slices are tight, and the activity is small. When the fish is operated, the fish is not easy to be injured. At the same time,
Helps prevent disease and promote early growth of fish.
Fifth, select fish species. To choose a large-sized fish, the general body size of green, grass, oysters, clams, cockroaches, cockroaches and other species should reach 15 to 20 cm. It is required to have high flesh-thickness, fat tail, complete scales, non-destructive fins, bright body color, no disease, no injury, and strong beating.
Six, strict disinfection. Before stocking on a sunny day, the fingerlings must be trained and disinfected with a net, and soaked in salt water at a concentration of 3% for 15 minutes. Under conditions, the diluted blue and grass carp can be injected on each tail of 18 cm above
Bleeding inactivated vaccine 0.5 ml, 0.3 cm per tail below 18 cm to prevent bleeding.
Seven, reasonable delivery. The water quality fertilizer ponds should be dominated by catfish. The ratio of polyculture should be 45% to 60% for carp, 5% for carp, and 10% for grass carp. 10% of squid, 10% to 5% of oysters, clams, and squid. Water thin, green fodder pool
Ponds should be dominated by grass carp, and the polyculture ratio should be 45% to 55% for grass carp, 20% for carp, 5% to 10% for carp, 10% to 5% for carp, cockroach and carp, etc. 1000 or so.
VIII. Strengthen management. After stocking the fish, the depth of water should be more than 2 meters to prevent freezing. After the water temperature rises above 6°C, appropriate feeding should be done to promote early growth of the fish species.
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