Methods, conditions and preparation before stocking of freshwater fish

Freshwater fish farming is a kind of production method that puts fish into water and tries to get yield. There are more than 30 kinds of freshwater fish farming in China.

This paper introduces the methods, conditions and preparation before stocking of freshwater fish.

1. According to the requirements of water temperature for cultured fish, the water temperature is generally 15-30℃, such as carp, grass carp, silver carp, bighead carp, crucian carp and bream.

Cold water freshwater fish culture: generally, the appropriate temperature is 10-20℃, such as rainbow trout and freshwater fish.

Hot water fish culture: generally, the appropriate temperature is 18-30℃, such as tilapia and freshwater pomfret.

Two. Freshwater fish culture methods According to the water conditions, fish species and specifications, water types and culture measures, freshwater fish culture can be divided into the following ways:

① Fish culture in still water and living water.

② Single cropping, mixed cropping and interplanting.

③ Pond culture, paddy fields, rivers, lakes, reservoirs, cages, purse seines and fences, and industrialized fish farming.

④ Intensive cultivation, semi-intensive cultivation and rough cultivation.

Three. Freshwater fish culture requires pond culture, which is a kind of fish culture method adopted in most parts of China. At present, its output accounts for more than 60% of freshwater fish culture, and it has the characteristics of small investment, large income, quick effect and stable output.

Area: Generally, the area of adult fish pond is 5- 10 mu, which is convenient for management.

3-5 mu is suitable for parent fish ponds, fry ponds and fish ponds.

Water depth: Generally, the water depth of fish ponds is 2-3 meters.

The suitable wintering pool in the north is under the coldest and thickest ice layer1.5-2m.

The water depth of fry pond and hatch pond is1.0-1.5m. ..

Fish ponds generally require a water depth of1.5-2.0m..

Water quality: Adequate water quantity and good water quality are the fundamental conditions for fish farming.

Requirements for the bottom material: the bottom material of the pond is preferably loam, sandy loam, followed by clay.

Fourth, the preparation work before stocking freshwater fish 1 and resting the pond.

Remove weeds and impurities from the bottom of the pond and level the pond.

2. Clean the pond for disinfection.

Cleaning the pond by indigenous method: that is, draining water in winter, freezing, drying and blasting the bottom of the pond, eliminating enemy damage and improving the bottom material.

Cleaning the medicine pool: quicklime or bleaching powder can be used.

3. Water injection and water quality cultivation.

After the pond is disinfected, the fresh water can be kept until the toxicity of the drug disappears, and the base fertilizer is put in 7- 10 days before the fish species are released to cultivate the water quality.