Measures to strengthen the cultivation of fish species in the autumn
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Disinfect the clear pond and transfer it to the original fish ponds in Xintang. After a few months of spring and summer breeding, the water quality will gradually age, the oxygen and food organisms will be reduced, and the pathogenic factors will be greatly increased, affecting the growth of the fish species. Especially small individual fish species, weak ability to catch food, growth is more inhibited. Grass carp grows in this environment and is also more susceptible to disease. Therefore, fish should be transferred to a new pool of conditions to strengthen the cultivation. In places where the water source is difficult, the water in the original fish pond can be used, and after several times of the net, the Dora will transfer all the fish species and use 40 to 50 kg of quick lime per acre to sterilize;
Size classification, reasonable matching of different specifications of the fish species to pool stocking, different varieties should be a reasonable match. Such as carp, carp-based, can be used with 30% of grass carp species; such as grass carp, carp-based, with about 30% of carp, carp species. The ratio of carp and carp is 5:1, and if the carp species is small, the proportion can be lower. If it is a pond for the cultivation of three kinds of fish, the density should not be too large. The total weight of fish per mu is controlled at 100 to 150 kg.
Strengthen feeding and fertilization For fish ponds dominated by alfalfa and squid, fertilization should be given priority to, supplemented with fine material, and generally 5 to 10 kilograms of fertilizer per acre per week (a ratio of 1:1 for nitrogen, phosphorus and potassium). : 0.5 is appropriate) or apply about 50 kilograms of livestock manure, evenly spilled water to cultivate food organisms in the water. For grass carp-based fish ponds, it is necessary to strengthen feeding. Each 10,000 fish species should be fed with about 5 kilograms of fine material each day. Together with some duckweeds and fresh grasses, they can be fed one at a time in the afternoon and the other at the same time. Inject new water to keep the water fresh and promote the growth and fattening of the fish to facilitate safe wintering.
Author unit: Chuxi Town Aquatic Product Station, Jiangyan City, Jiangsu Province