Key measures for cultivating large size fish species
Fish species are the material conditions for stable and high yield of adult fish. Practice has proved that large-size fish species have strong ability to adapt to the environment, escape from enemy damage, disease resistance and feeding ability, so the survival rate is high, the size of water is large, and can achieve the goal of high yield. In order to cultivate large-scale fish species, in addition to feeding "four fixed" baits, "three-look" fertilization, daily pond patrol and fish disease prevention and control, the following measures should also be taken:
1. Add new water to improve the water quality. "when the water rises by an inch, the fish grows by three cents" and "the wide water raises the big fish". In the process of feeding, we should often add new water to adjust the water quality, increase the dissolved oxygen in the water, expand the activity space of fish species, and promote the growth of fish species. This is the truth of "live fish in water". Generally add water 2-3 times a month, each time 0.7-1 cm deep.
2. Mixed culture and reasonable sparse culture. The effect of mixed culture of fish species is good, and mixed culture can make full use of water space and bait. In order to carry out mixed culture, fish species with different feeding habits and different active water layers should be raised together. If you mainly raise grass carp, you can match 15-20% silver carp or bighead carp; if you raise silver carp or bighead carp, you can match 10-30% grass carp. Reasonable sparse culture is one of the important measures to cultivate large size fish species with strong fat. Generally, there are 7.5-90,000 summer flowers per hectare.
3. Timely screening and separate cultivation. In the fish breeding stage, there are often different growth rates of fish species, forming large "predators" and small "weak larvae". It is necessary to screen and separate ponds, so that the specifications of similar fish species are basically the same.
To sum up, the key measures for cultivating large-size fish species can be summarized as the "Fifth five-year Plan" rule, that is, 5000 summer flowers per mu are filled with fresh water five times, and the pond water depth is 1.5m. After 5 months of breeding, the yield per mu is more than 16.5cm and 250kg.
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