Adult fish ponds
First, sets of fish ponds. Fish ponds that use herbivorous fish as the mainstay of fish are more suitable for rearing catfish. Grass carp, squid, and other herbivorous fish live in a water environment with fresh water and rich oxygen, like the squid. At the same time, most of the water used for feeding are collected from natural waters such as rivers. Wild juvenile fish and fish eggs provide a rich source of feed for the growth of sturgeon. In addition, the requirements of these fish are basically the same, and the management is more convenient when adopting measures such as water-injection, water-exchange, and oxygen-enhanced water quality control.
Second, sets of varieties. The cultivated carp species is good for acrocephalus. Due to its high growth rate, large adult individuals and easy culture. Into the fish pond within the appropriate amount of eel breeding, under the conditions of adequate feed, after more than six months of breeding, the annual average size of carp at the end of up to 0.5 kg.
Third, set the time. Sets of eel fish species specifications should be more than 5 cm, time is appropriate in early June. More than 5 cm of carp have strong self-intake ability and are relatively easy to prey to bait fish. Therefore, raising the survival rate of the carp by using large-sized catfish species to grow into adult fish ponds. Because the adult fish pond reaches the beginning of June, a certain number of wild fishes have been produced in the pond for feeding. At this time, the specifications of the spring-blooded carp seedlings generally reach 5 cm or more, which is suitable for nesting. If stocking is too early, the amount of wild fish in the pool is small, and the size of eel is also small, affecting the survival rate; if the stocking is too late, the breeding time will be shortened. The nesting density should be based on the supply of bait fish in the pond, and generally it is appropriate to nest 30 fishes per mu.
Fourth, the right amount of provisioning. When the squid species are put in place, the appropriate amount of regular fish summer flowers for predation by the squid will greatly increase the survival rate of the squid and ensure that the squid has a sufficient amount of palatability bait fish for a period of time and can promote better Squid grows. In addition, some summer flowers that are not predated by squid grow into healthy and high-quality large-scale fish species. The summer flowers to be bred are mainly grasses and squid, and 10,000 per mu are appropriate.
Fifth, strengthen water quality management. The requirements for water quality are relatively high. They require stable water quality, fresh water and adequate dissolved oxygen. The specific indicators are that the water depth of the pond is not less than 1.5 meters, the dissolved oxygen is 5 mg/liter or more, the water transparency is about 35 centimeters, and the water quality is alkaline. In the hot season, add new water or change the water every 10 days. Apply lime once every 20 days. Improve water quality conditions and environment, depending on the specific circumstances of the timely increase in oxygen, especially in rainy weather but also in time to increase oxygen, to maintain adequate dissolved oxygen.
6. Use fishery drugs with caution. Since catfish are more sensitive to fishery medicines, they should be especially cautious when using fishery medicines. The measurement should be accurate and the splashing should be uniform. The concentration of the drug should not be low, and fishery drugs should not be used as much as possible during the high temperature season. Trichlorfon should be used with caution to ensure stable production and high yields.
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