What kind of fertilizer water is mainly used in winter fish ponds? How to manage?

With the arrival of winter, the sharp decline and repetition of air temperature and water temperature have brought difficulties to freshwater aquaculture. Some fish ponds are out of stock, dead fish, and so on. How to ensure the safety of fish to survive the winter is an urgent event for the majority of farmers. What fertilizer and water are mainly used in fish ponds in winter, how to manage and other issues, let's take a look.

What kind of fertilizer and water are mainly used in fish ponds in winter?

Generally, organic and inorganic fertilizers are used scientifically according to different seasons, as follows:

1. For intensive farming mode (grass carp), fertilization should be carried out in spring and autumn according to water temperature and feeding conditions, due to the application of bio-organic fertilizer or organic-inorganic compound fertilizer, in the middle (inorganic fertilizer when the water temperature is high in summer), re-application of base fertilizer, skillful application of phosphorus fertilizer, nitrogen promotion by phosphorus, fertilization skills through "four look" (that is, depending on the season, weather, water and fish condition) The reasonable fertilization by the combination of organic, compound and inorganic fertilizer can keep the fish culture water in the state of "fertilizer, live, tender and cool".

2. In winter (November-February), the water temperature is low, the dissolved oxygen is high, and the oxygen consumption is low. Applying a certain amount of bio-organic fertilizer as base fertilizer can promote fertilizer and water in the coming year. (in the process of daily breeding, there will be friends who apply base fertilizer in winter, fertilizer and water will be especially fast in the coming year. On the other hand, the effect of fertilizer and water is slow or always unable to get fat. At the same time, for silver carp users who mainly raise flowers or raise flowers, it can only be said that the fish grow slowly when the water temperature is low, but not stop growing completely. It has been proved by scientific research that diatoms and rotifers grow normally even below zero degrees of ice. Dissection found that even if the winter temperature is lower, there will still be a large intake of food in the intestines and stomach of the fish. This shows that it is quite necessary to supplement nutrients to the water body during the relatively low temperature period in order to promote the fish to keep fat and maintain a healthy state. When the water temperature rises in spring (March to May), the water quality becomes thicker, and the feed organisms in the pond will multiply in large numbers, which is beneficial to the growth of fish. At this time, according to the water temperature, the fertilization is mainly bio-organic-inorganic compound fertilizer and bio-organic fertilizer. For the water body is particularly thin, but also because the amino acid fertilizer and water solution is used at the same time, it should be a small amount, and the period from June to September in the high temperature season is the period with the largest amount of fish excretion. Oxygen consumption is large, at this time, do not apply fertilizer or only supplement phosphate fertilizer, mainly to transfer water to change the bottom (because feed and fish excrement is also a kind of fertilizer, but must regularly use biological agents for rapid decomposition and utilization, otherwise it is easy to cause oxygen consumption and final dissolved oxygen is too low and lead to ammonia nitrogen and nitrite exceeding the standard. If the water quality is relatively light, the amount of fertilizer should also be applied more frequently and less frequently to keep the water quality fertile.

Second, how to manage fish ponds in winter?

1. Sale of adult fish

In winter, the storage load of most fish ponds is large, and the decrease of water temperature affects the digestion, absorption and utilization of bait. The amount of feed is seriously insufficient, the fish can not grow normally, and fat loss will occur. After the fish is released, the storage capacity of the fish pond is reduced, the culture density of the fish pond is reduced, which is conducive to the digestion and absorption of bait, and small fish species can be released in time, so as to make a good plan for the culture in the coming year!

2. Water quality management scheme

In winter, the water temperature of fish ponds is low, the activity of aquatic organisms is reduced, and photosynthesis is weakened, so it is necessary to supplement a large number of algae species and increase the number of beneficial algae in fish ponds. On the one hand, it can improve the photosynthesis of algae and increase the dissolved oxygen in fish ponds. On the other hand, the number of algae increases. Improve the heat preservation capacity of the water and raise the water temperature! It is recommended to use Bacillus subtilis such as Bacillus subtilis to sprinkle water evenly at the rate of 20-50ml/ mu.

3. Feeding management scheme

With the decrease of water temperature, the emphasis on fish feeding decreases greatly, and the growth rate slows down (or even stops), so it is necessary to feed scientifically in feeding. Here, it is suggested that feeding such as probiotic aquatic product solution can ensure the normal feeding of fish without wasting feed, thus reducing the culture cost. In terms of feeding rate, the recommended feeding rate of grass carp fry is 3% 3.5%. Feed 3 meals a day, 2% Mel 2.5%, 3 meals a day, 1.5% Mo 2% of grass carp, 3 meals a day!

4. Disease prevention programme

In the cold winter, due to the low water temperature, the immunity of fish decreases and the disease resistance is weak. It is recommended to use Jinjieduling to improve the immunity of fish.

Fish are easily infected and invaded by fungi and parasites in low temperature season, so strict disease prevention measures should be taken and water bodies should be disinfected regularly. Improve the bottom quality to reduce the incidence of sunken fish and ensure the health of the fish!

As the fish is bruised by pulling the net, it is easy to cause water mildew, so it is recommended to sprinkle it all over the pond with water mildew or methylene blue. In addition, at this stage, the prevention of parasites (stingers, rotifers, oblique tube worms, etc.) is also very important, select targeted drugs to kill.

5. Daily management plan

Patrol the pond once a day in the morning, in the middle and in the evening, pay attention to observe the change of the water color of the fish pond and the eating and activity of the fish, and make a good record, add new water to make the water depth of the fish pond reach about 2 meters, increase the volume of the fish pond, improve the heat preservation capacity of the fish pond, open more oxygen machines to stir the water body, and prevent the floating head of the fish caused by convection up and down the water body. For dry ponds, desilting and drying ponds should be carried out to ensure aquaculture in the coming year.