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Second, the winter fish species must catch large specifications. Large-sized fingerlings have a high survival rate, fast growth, and a short cycle, and they can meet the specifications of commercial fish in the year, which will have a decisive effect on adult fish production in the next 1-2 years. It has been proved that the survival rate of fish species below 10 cm is only 1%, and the survival rate of fish species above 14 cm can reach 80-90%. To implement a model intensive culture, 667 square meters of semi-intensive fish ponds with a yield of 250 kilograms, 500-600 large fish species (weight 12.5 kg-15 kg) per 667 m2, and a multiplier of 20-27.3 times, 667 Production of 400 kg of refined ponds in square meters, 1200-1400 tails (weight 100 kg-120 kg) per 667 square meters, weight increase 5-6 times; 667 square meters output 500 kg of intensive ponds , 2400-2600 tails (weight 130 kg-170 kg) are released every 667 square meters, with a 3-4 times weight gain.
Fish species should be selected as large, robust, disease-free large fish species, and their specifications are as follows.
1, herring. It is best to stock 2nd instar fish weighing 0.5 kg-1 kg. They can take large amounts of snails and clams. At the end of the year, they can weigh as much as 1.5 kg - 2.5 kg or even 3.5 kg.
2, grass carp. Stocking 2nd-instar fish weighing 0.25kg to 0.5kg, or allocating less than 1.5kg as fingerlings, will be kept in the following year. They grow fast and have a high survival rate. At the end of the year, the tail pond can weigh up to 1.5 kg - 2.5 kg.
3, squid. Tail weight 25 grams or more. At the end of the year, Tong Tail weights up to 0.5 kg - 0.6 kg.
4, squid. Tail weight 25 grams or more. At the end of the year, Teng Tang Mei weighed 0.6 kg - 0.7 kg.
5, squid. Tail weight 10-15 grams. At the end of the year, the tail pond can weigh up to 0.5 kg.
6, squid. Tail weight 5-10 grams. At the end of the year, the tail pond can weigh up to 0.15 kg - 0.2 kg.
7, squid. Tail weight 8-14 grams. At the end of the year, it can grow to a tail weight of 0.2-0.3 kg. The second-instar fish with a tail weight of 50-150 grams can be weighed at 0.5 kg-1 kg at the end of the year.
8, tilapia. Tail weight 2.5 grams. After six months of feeding up to 0.2 kg -0.4 kg.
High-yield ponds how to put fish in winter
First, winter fish should be caught in early release. The time for feeding fishes is appropriate for the late winter and early spring, and it is the best season before and after the Spring Festival from the winter solstice to the rain. During this period, the temperature was low, the fish body was strong, easy to operate, and the sensitivity rate was low. It is better not to delay the winter fish species in ponds, and early release can increase the benefit by 40-50%.