How Big Can Silver Carp Actually Grow in One Year of Intensive Culture?
AbstractSilver carp in intensive culture can reach the market size of 4 jin in one year, while ordinary culture can only reach about 2.5 jin, so to reach about 4 jin in one year, you need to feed compound feed and also ensure good water quality. In silver carp culture, the first thing to pay attention to is the stocking density. If the stocking density is too high, it will directly affect the growth of silver carp, so the stocking density should be determined according to the size of the culture pond, and one mu of pond should not exceed 300 fish at most.
Under good water quality conditions and with intensive feeding of compound feed, silver carp can grow to about 4 jin in one year of culture, but under ordinary culture it can only grow to about 2.5 jin in one year.
Stocking density of silver carp
In silver carp culture, the first thing to consider is the fry stocking density. If the stocking density is not paid attention to, a series of problems will arise, the most important of which is excessive density. In pursuit of high yield, farmers often stock at too high a density; in fact, this restricts the growth of the fish. The fry put in may be about 1 jin, but after a year of culture they can only grow to a little over 1 jin. This exceeds the limit of using photosynthesis in the water body to cultivate natural food to produce silver carp.
If the fish yield is to be high, the correct stocking amount should be calculated according to the yield per mu. If the expected yield per mu is 600 jin and the market size is about 3 jin, then stocking should be based on 250 fish/mu; accounting for losses along the way, the stocking number should not exceed 300 fish/mu at most.
Size of stocked fry
The stocking size of silver carp should be determined according to local consumption habits and market price trends. In Sichuan, fish prices are highest from June to August each year, so selling on the market in this season can maximize profits. Therefore, at least more than half of the stocked fry should be of large size, or all fry stocked should be of the large size of over 1 jin.
Choice of fertilization
For silver carp, fertilization mainly uses raw organic matter, bacterial strains, chemical fertilizers and organic fertilizers in rotation. Each fertilizer has its own advantages, ensuring a balanced intake of nutrients by the fish. In silver carp culture, there are also cases where a lot of fertilizer has been applied but the water simply will not become fertile. At this time, based on experience, experimental fertilization of the water is needed. What many farmers most commonly do is supplement compound lactic acid bacteria and carbon source amino acids together, which can quickly make the water fertile.
Frequency of fertilization
The frequency of fertilization can refer to the feeding in intensive ponds. For fertilizing the water to culture silver carp, fertilizer is generally applied about once every 3 days. On cloudy days when photosynthesis is weak, fertilizer is also needed; if no fertilizer is applied on cloudy days, powdered feed needs to be given to ensure the fish's food intake.
Culture ratio of bighead carp and silver carp
The culture of bighead carp and silver carp depends on the size of the pond. If sufficient organic fertilizer is added to the water body, the proportion of bighead carp can be increased, and at the same time bacterial strains as well as nitrogen and phosphorus also need to be added to the water. The more that is added, the greater the proportion of bighead carp can be, reaching up to 80%.