The cultivation of fish species

After the summer flower divides the pond to the end of the year, the 1-year-old fish with a specification of 12-15 cm and a weight of 30-40 grams are spring flower species. The growth cycle of green carp and grass carp is 3-4 years, and in some places, 1-year-old fish are cultivated into 2-year-old fish with 500 grams.

1. Fish pond: in order to cultivate large size fish species, it is suggested to build a special fish pond with an area of 3-5 mu and a water depth of about 2 meters. The preparation of summer flower fry before entering the pond is the same as that of fish fry pond.

2. Stocking: there are two ways of monoculture and mixed culture. Generally, mixed culture is adopted, mainly carp, carp, grass carp, silver carp, bighead carp, silver carp, bighead carp, grass carp, grass carp,

3. Stocking density: it depends on bait, culture technology, pond condition, growing period and fish species coming out of the pond. Monoculture density: if 6000 summer flowers are released per mu, the specification is 12-15 cm; if about 9000 per mu, the specification is 9-12 cm. The mixed culture density can be calculated according to proportion.

4. Daily management:

⑴ ponds dominated by silver carp or bighead carp should be fertilized with basal fertilizer before stocking, fertilized at the right time after stocking, and fed with a certain amount of grain bait; ponds dominated by grass carp and carp were mainly green fodder with appropriate amount of concentrate feed; ponds dominated by carps were fed with pellet feed; ponds dominated by herring were fed with green manure or manure.

⑵ adheres to the principles of "four looks" (looking at the season, sky, water and fish) and "four determinations" (timing, quantitative, qualitative, positioning). If the water temperature is low in early spring and late autumn, you should cast less in sunny days, less in cloudy and rainy days, no more in heavy rain, less in water and fertilizer, more in thin water, more in food, and less in appetite. Bait twice a day, once in the morning and once in the afternoon, feeding regularly. The amount of feeding is relatively fixed and can not be increased or reduced. The bait is fresh, clean and palatable, and the bait should be fixed in position.

The daily management of ⑶ is the same as that of fish fry stocking. The table should be disinfected to prevent the occurrence of fish disease.

5. Merging ponds and overwintering: in late autumn and early winter, when the water temperature is below 10 ℃, the ponds are classified according to fish species and specifications. In the north of China, the winter is long and the climate is cold, so it is necessary to ensure that the fish species survive the winter safely. After August, the overwintering fish pond does not apply organic fertilizer, and adjusts the water quality before freezing, that is, the old water of the pond is drained out 2 times 3, injected with new water, and inorganic fertilizer is applied, 2-3 kg urea per mu, and the water transparency is kept at about 30 cm. Clean the snow on the ice in winter, which is beneficial to the transmission of sunlight and change the water 20 centimeters per month after freezing.