Management of fish ponds in May needs to be done in four areas

In May, with the gradual increase of temperature and pond water temperature, freshwater fish have also entered the normal growth stage. In order to consolidate management, aquaculture households should, as always, do the following four things:

First, top dressing

Top dressing is to continuously supplement the nutrients in the pool water, and promote the continuous propagation of natural food organisms to meet the feeding requirements of pool fish. Generally, 100-200 kg of organic fertilizer is used per acre of water, and 1015 kg of inorganic fertilizer is used to keep the water “fat, live, tender, and cool”. Topdressing should be “five”: one look at water. Changes in the color of the pool water can reflect the thinness of the pool and the amount of food. The pool water is yellow-green or dark brown, indicating that the pool water is more fat; if it is light green or yellow, it is thin water, and top dressing should be considered. Second, look at the water temperature. The temperature of the water can determine the fertilizer utilization rate and conversion rate. Look at the weather three times. Top dressing is better in sunny weather. During thunderstorms and hot weather or rainy weather, when the fish frequently floats, they should seldom chase or not top-up fertilizer, otherwise it will lead to lack of oxygen in the pool water and cause flooding phenomenon. Fourth, watch the growth of fish. The growth rate of fish and the degree of fattening are related to the amount of bait in the pool water, and the fish growth status should be regularly checked. Five to see the pool water acidity. The pH of pool water should be neutral (pH about 7), too high (more than 8) or too low (below 5.5) not suitable for fish growth. The type, nature of the fertilizer, and soil properties of the pond bottom soil have a great influence on the pH value of the pool water. The loessial pond bottom or often chasing inorganic fertilizer (fertilizer) can easily lead to acidic water quality. Therefore, when top dressing, organic fertilizer and inorganic fertilizer are required to be alternately applied to maintain a balance of various nutrients in the water. When the water quality is acidic, it can be adjusted with quicklime.

Second, feeding

Feeding runs through the entire aquaculture production process. In the high-yielding fish ponds where fishes are mixed together, there are few natural foods that can be ingested by fish. Artificial feed must be fed to meet the feeding requirements of various fish in the pond and to achieve rapid growth. In order to reduce the feed coefficient and improve the utilization rate of feed, feeding and feeding should be done "four sets" and "four look".

(I) "Four Sets"

1, timing. In order to develop the habit of eating fish on time, they are usually fed once a day from 8 to 9 o'clock in the morning and from 3 to 4 o'clock in the afternoon. At this time, the water temperature and dissolved oxygen are higher, and the fish eat well.

2, positioning. Training pool fish concentrate on eating at a fixed location (food or food court) to check food intake, remove debris and disinfect food courts.

3, quality. Feed must be fresh, good palatability, so that all kinds of fish can feed. It is best to feed nutritionally comprehensive compound feeds and not to feed them with spoilage feeds.

4, quantitative. Feeding should be done properly and evenly to facilitate digestion and absorption of fish. The amount of daily feed for concentrate feeds is generally 12% of the total weight of ponds. Feeding should also be based on the weather, water quality, fish eating and other conditions. If the weather is normal, the water quality is good, and the appetite of the fish is strong, the amount of feeding can be increased; otherwise, the amount of feeding is reduced. If the fish eats the feed quickly after feeding, the amount of feed should be increased appropriately; if the food can not be eaten for a long time, if there is more leftover material, the amount of feed should be reduced. It is usually appropriate to finish in 2 hours. There should be no leftovers when checking the table (field) in the evening.

(b) "Four Looks"

1, see the fish's feeding situation. That is, observe the length of time the fish eat at the table or food court. If you put in a normal amount of feed, the time for the fish to eat is less than 2 hours, indicating that the feed is insufficient, and the feed should be properly added; if the feed amount is certain, the feed after 10 days will be eaten by fish less than 2 hours, indicating that the farmed fish have The weight gain should be increased; if the fish population has been dispersed, and there are still leftovers in the food table or food market, it means that the amount of feed is too much and should be reduced next time.

2, see fish swimming situation. If the surface of the fish swimming is not calm, you should check the fish for parasite disease, otherwise the fish may be in a state of starvation, increase the amount of feeding.

3, see the growth of fish, that is, regular sampling (30 times each) to check the growth of fish, generally check once a month. In the case of appropriate stocking densities, reasonable proportions, and lack of disease, if the growth of fish is found to be far below the pre-specified specifications, the individuals have large disparities, indicating that the fish are insufficient in food and are often in a state of starvation or semi-starvation and should be appropriately increased. Feeding amount.

4, see the water quality. For fish ponds that are based on carp and carp, if the transparency of the pond water exceeds 40 cm, or the water quality is reduced from fat to fat, or the filter-feeding fishes have large heads, small tails, narrow backs, and inability to swim, they indicate that water is available. Less plankton is fed by fish, organic fertilizer and chemical fertilizer should be added in an appropriate amount, and artificial feed should be fed. For fish ponds mainly based on carp, the degree of hunger and satiation of the carp can be judged based on the turbidity of the pond water. Such as pond water is very muddy, was muddy yellow, indicating that the carp in the bottom of the pond feeding activities are frequent, constantly arching mud, can be determined that the carp is hungry, should increase the amount of feeding.

Third, the transfer of water

In May, it is necessary to control the depth of pool water and adopt water injection measures in phases, that is, do not fill the water at one time. Gradually join from shallow to deep to increase water temperature and promote rapid growth of fish. Generally, water is added 10 to 15 days. The water depth is controlled at about 1.5 meters; the general principle is: a small number of times, so that the water is yellow-green or dark brown, the water transparency is maintained at about 30 cm.

Fourth, disease prevention

In May, fish are prone to saprophytic disease, gill disease, enteritis disease, and small melon worm disease. Preventive measures must be taken. Parasitic diseases commonly used drugs such as crystal trichlorfon, copper sulfate, salt, etc.; bacterial diseases can be used bleaching powder, quicklime and other drugs for prevention and treatment. In addition, Chinese herbal medicines such as Maple Leaf, Garlic, Galla are also good medicines for preventing and curing diseases. At the same time, it is necessary to step up the inspection of the ponds to avoid damage to fish by birds, rodents and water snakes.

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