Songjiang bass can be cultured on the plateau, Songjiang bass breeding tips.
1. Fish pond conditions
The pond can be a cement pond or a hard-bottom soil pond. Some bamboo tubes can be laid on the bottom or wall of the pond, or bricks, tiles, etc. can be piled into a cave. The shape is adapted to the characteristics of Songjiang Perch that inhabits dark places during the day and comes out to forage at night. The shape of the pond is preferably rectangular, running east-west, with a length-to-width ratio of 2:1. The slope of the pond can be larger, and the bottom of the pond should be flat with a slight slope to facilitate drainage of the pond water. The pond area should not be too large, generally 300 to 700 square meters, and the water depth should not exceed 1 meter. The water quality of the water source must be good. The fish pond must be close to the water source. The water source must be living water, not stagnant water. Circulating water is best.
2. Temporary breeding of fish fry
After the pond has been disinfected with fish medicine, fish fry can only be put in after the toxicity of the medicine disappears. The ideal pond for temporarily raising fish fry is 300 square meters, and generally about 5,000 Songjiang perch fry can be stocked. Before placing the fry, base fertilizer, such as manure, green manure, etc., needs to be added to the pond. After the water quality of the fish pond is improved, a certain number of freshwater shrimps can be put in so that they can breed young shrimps and serve as bait for Songjiang perch. After the Songjiang bass fry are put into the fish pond, they should be raised in the same way as the silver carp and bighead carp species are cultivated, so that there are abundant zooplankton in the water. However, the water quality must not be as fertile as the silver carp and bighead carp species that are cultivated. The shrimps in the water must be controlled. The head does not float due to lack of oxygen in the early morning. Generally, the dissolved oxygen in water should be kept above 5 mg/L. The time for stocking Songjiang perch fry can be carried out from the end of April to the end of May. The fry are caught from the shallow seas along the coast and the sluices near the rivers for temporary rearing. After about one and a half months, they should be reared in separate ponds. Until the fish matures.
3. Adult fish breeding
The size of adult fish ponds is generally about 700 square meters, which can be divided into two types: monoculture and polyculture. A single fish pond of about 700 square meters can be stocked with about 1,000 summer flowering fish species. Appropriate fertilizer should be put in the pond water, and live shrimp, small benthic fish or live fly maggots should be fed regularly. Polyculture fish ponds are generally less effective and should not be promoted. It is necessary to pay attention to the fish species that are polycultured. They are suitable for polyculture with grass carp and bream, but not with silver carp, bighead carp or broodstock.
4. Daily management
The living conditions of Songjiang perch are extremely demanding, and the ecological environment requirements are also different from the raising methods of domestic fish, so daily feeding and management are particularly important. The focus of daily management work is: the pond must be inspected in the morning, noon and evening every day, and measures must be taken in a timely manner according to various situations. Check at dawn every day whether there are floating heads; whether shrimps and small fish that feed the Songjiang perch are hypoxic; and whether sick and dead fish are fished out in time. Check for signs of floating heads near dusk to ensure safety at night. Especially in the hot summer season, when the weather changes suddenly, it is hot and windless, haze or before and after rainfall, it is necessary to strengthen pond patrols to keep track of the fish situation, regularly inject fresh water, maintain good water quality, and do a good job in preventing escape and disease prevention.
5. Fish disease prevention and treatment
Leukoderma symptoms: In the early stage of the disease, some white dots appear at the caudal peduncle, and quickly expand, causing lesions on the dorsal and anal fins to move to the body surface When the base of the tail fin develops, it turns white, and it dies soon after. The pathogen is Trichobacter albicans, which has a rod-shaped body with 1 to 2 flagella at the top. The disease occurs in both fingerlings and adult fish, and the onset time is from June to December. Preventive methods include keeping the fish pond water quality fresh and the feed rich and fresh. During fishing operations, try to prevent fish body injuries. Before stocking fish species, use mercury nitrate at a concentration of (2 to 3) × 10-6 to bathe for about 1 hour. If the fish is found to be hypoxic during bathing, it can be inflated to increase oxygenation. Treatment method: mercurous nitrate (0.1~0.2) × 10-6 concentration, pour wine in the whole pool; "gallnut" (2 ~ 4) × 10-6 concentration, pour wine in the whole pool.