The basic conditions of fry fingerlings
The fry is the collective name from the hatching to a body length of 3.3 cm. Newly hatched fry is called splash or fish flower and sea flower. The hatchlings that have just hatched for half a day to two days are also called “niaokou seedlingsâ€; the hatchlings that are hatched from the third to the seventh day are called “old mouth seedlingsâ€. The fry is reared for 20 days to 30 days and becomes a juvenile with a length of 3 cm. It is also called a summer flower or a piece of fire. The summer flowers are reared for 3 months to 5 months. The body length is 10 cm to 16 cm. It is a 1 year old fish species. Or press the outlet time, respectively called the autumn film, winter film, spring film.
Well-fed fingerlings are the basis for achieving high-yield commercial fish and high yields. To this end, seedlings should have the following basic conditions:
To meet the local climate, water quality, feed and other conditions, fully meet the annual plan requirements for commercial fish production. Seed breeding should be supported by feed supply and commercial fish listing programs. The number and specifications of first-instar fish should be in line with the stocking plan for adult fish ponds in the following year. When stocking 2 year old fish species, the adult fish ponds in the following year should be considered. The plan calls for a step-by-step development of one year in one year to achieve a balanced production of commodity fish in successive years.
The types of seedlings must be comprehensive, and the mixed-feeding and integrated breeding mode of different food-like fish pools can be realized to make full use of water bodies, natural feeds, and agricultural resources.
Seedlings should be strong, no injury, no disease, and the specifications should be larger. This is an important prerequisite for improving the survival rate and aquaculture efficiency of fish. In particular, fish stocks stocked in lakes, rivers, and reservoirs must also be of sufficient size to reduce escape losses and avoid enemy invasion.
To select good quality seedlings, you should master the following tips:
Look body color. For the same batch of fry 3 days to 4 days after hatching, the body of good quality fish should be shiny, the same body color, no dead white fish, clean body, slightly yellow or red. For fishes 3 cm to 4 cm in length, such as grass carp, the body should be pale golden yellow; carp, silvery gray on the back, white silver on both sides and abdomen; carp, pale yellow, black spots are not obvious .
Watch swimming. The fry, the water in the bucket stirs to form a whirlpool, and those who swim against the water at the edge of the swirl are physically strong fry. If the fish fry into the porcelain basin, mouth blowing water surface, where the backwater swimmer is a good fry; the water is drained, the fry in the pelvic floor can be struggling, the head, tail can be bent or circle, is a strong fry. For fish species, such as swimming and active, top water strength, dense fish in the cage when the head down, only to see the fish tail kept flapping, it is a strong fish species.
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