What are the precautions for raising fish in spring?
As temperatures rise, spring gradually approaches. For fish farmers, spring is a headache, because spring is often a season when fish diseases occur frequently. If no great attention is paid and preventive measures are not taken, it will bring huge economic losses to production. So what should be noted when raising fish in spring? Let's take a look together.
1. Apply additional fertilizer
Spring is the period for releasing fry. During the seedling stage, feed cannot be given directly. Generally, algae or plankton are used as natural bait, so algae and plankton must first be developed. In spring, when the temperature is 8-10 degrees, additional fertilizer should begin to be applied. The amount of fertilizer should be determined by the quality of the water and the quality of the fertilizer. Generally, 60-90 jin of human excrement and urine or 100-150 kg of livestock manure is applied per mu. Of course, if these farmyard manures are not available, chemical fertilizers can also be used. Generally, the ratio of nitrogen, phosphorus and potassium is 1:1:0.5, applied by splashing over the whole pond, with 5-7 kg applied per mu.
2. Feed bait
After overwintering, the fish's constitution is relatively weak and their immunity is poor, while changes in the external environment can easily cause some diseases in fish, such as saprolegniasis, gill rot and enteritis. Therefore, bait should be fed in time to enhance the fish's resistance and prevent disease. The choice of bait must also be quality guaranteed to achieve the effects of promoting digestion, compensating nutrition and promoting growth. It is best to mainly use concentrated feed such as soybean cake, bran and cornmeal, feeding once a day at a fixed time and fixed location, with the feeding amount being 1.5%-3% of the fish body weight, and as the temperature rises, gradually increase the feeding amount and feeding frequency. At the same time, feed an appropriate amount of aquatic plants.
3. Add water and change water
In early spring, the water temperature is relatively low, and the fish are smaller, so their activity space and food intake are both relatively small, so the water level of the breeding pond should not be too deep. As the temperature rises, the fish gradually grow larger, and their activity and feeding increase, so at this time water should be added in time to increase the water level. In early spring, the water should be changed once, replacing half of the total pond water. After that, water should be added once every half month, raising the water level by 10-15 cm each time. When the temperature is suitable, keep the water level at about 1 m. At the same time, strengthen water quality management and change water frequently. Each water change should not be too much; one third is appropriate.
4. Disease prevention and control
The breeding pond should be managed by a dedicated person every day, with inspections once in the morning and once in the evening. Residual bait should be fished out to keep the water clean. When feeding, the freshness of the feed must be ensured, and spoiled or deteriorated feed should not be fed. At the same time, regular disinfection should be carried out, using various drugs to prevent fish diseases. Splash bleaching powder over the whole pond once every half month. If fish diseases are found, diagnose and treat them in time.
The above is an introduction to the precautions for raising fish in spring. I hope it can help you. To learn more related knowledge, please follow us.