Fertilization can increase fish natural bait matters needing attention in fish ponds in spring

Fertilization in fish ponds is beneficial to the reproduction of natural fish bait such as plankton, epiphytic algae and benthos. After fertilization, a large number of microorganisms multiply and organic debris increases, which enriches food resources for farmed fish such as silver carp and bighead carp, and some rotten organic fertilizers can be eaten directly by fish such as common carp and crucian carp. When applying fertilizer to fish ponds in spring, attention should be paid to the following:

Fertilization of fish ponds in spring

1. Organic manure must be fermented fully:

In spring, the water temperature of fish ponds is low and the water is rich in oxygen. Reasonable application of organic fertilizer not only has a low cost, but also has a good culture effect. Dung, livestock and poultry manure and other organic fertilizers were applied in fish ponds and fully fermented. Fermented fertilizer with complete decomposition of organic matter into fish ponds can not only reduce oxygen consumption in water, but also be quickly absorbed by phytoplankton and kill pathogens in organic fertilizer.

2. Apply less, evenly and diligently:

The so-called "less application" means that dozens of kg to 100 kg of organic fertilizer is applied each mu; the so-called "uniform application" means that the fish ponds are evenly sprinkled with water and manure to make the water of the fish ponds look yellow-brown or oil-green, the surface of the water is free of oil film, and the transparency is kept at 20m; the so-called "frequent application" means that when the fertility of the pond water decreases and the transparency of the pond water is greater than 30cm, it will be fertilized immediately.

3. According to the conditions of fish, determine the amount of fertilizer:

For the fish ponds that do not mainly raise silver carp and bighead carp, due to feeding feed, the amount of fertilizer applied in spring needs to be reduced, so that the transparency can be kept at 30ml / 40cm. With the increase of air temperature, the fertilizer degree of pond water becomes larger and larger. Although some silver carp and bighead carp are mixed in fish ponds with high yield of carp and grass carp, it is not suitable to apply fertilizer in spring.

4. It is better to apply fertilizer on a sunny morning:

Pay attention to listen to (watch) the weather forecast and do not apply fertilizer on cloudy or rainy days. Phytoplankton propagate and grow through photosynthesis. Fertilization in the morning of 3 consecutive days of sunny weather can promote microbial proliferation, minimize water pollution caused by organic fertilizer, and ensure a virtuous cycle of fish ponds.

5. Change the water regularly to keep the water fresh:

If the accumulation of organic matter and all kinds of biological metabolic wastes in fish ponds is excessive, the oxygen content in water decreases and the composition of plankton is poor, the growth of fish will be affected. Therefore, fresh water should be injected regularly to prevent the water quality of fish ponds from being too fat and to keep the water quality "fat, alive, tender and cool" all the time.