Ayu is also known as squid and fat fish, belonging to the family Apialidae, which is mainly produced in Japan, North Korea and the eastern coast of China. Ayu is an annual small-scale precious economic fish, fresh meat, delicious taste, favored by consumers at home and abroad. According to the author's many years of practical experience, the aphid pond culture technology is introduced as follows.
I. Pond conditions
The aquaculture area is 100 square meters. The inclination of the drainage from the bottom of the pool to the center is maintained from 1/10 to 1/15. The bottom is suitable for the cement bottom, and the water depth is 60-80 cm. The water quality is fresh, pollution-free, and the amount of water is sufficient. The average temperature of the water should be above 13°C, the pH value should be 6.5-7.8, and the dissolved oxygen should be more than 3 ml.
Second, fry stocking
In general, fish fry 3 to 4 cm in length are appropriate, and the stocking density increases or decreases depending on the amount of water. If the amount of water is sufficient, 400 squares are put on 3.3 square meters, and 10 to 200 tails are placed under normal conditions.
Third, feeding and management
1? Feed: Natural feed is mainly cultivated with algae, artificial feed is made up of 60% to 70% of animal food such as prawn and fish meal, and plant feed is made of soybeans, rice bran, etc., accounting for 30% to 40%. Hand-processed feed, feed more fresh fish or fish meal and other several mixed bait and formulated feed, in general the feed moisture content should be maintained at 60% to 65%, was porridge-like better.
2. Feeding: The amount of feed per day is 10% of the body weight of ayu, which is fed 3 to 5 times. After the previous feed is finished, it is better to continue feeding. The growth of ayu is directly proportional to the amount of feed, so changing the type of feed during the breeding period will affect its growth. In terms of general feeds, feeds that contain many animal species grow faster, whereas those that contain more plants are slower to grow. Cod feed has a good growth effect on sweet fish.
3? Management: The spring water temperature is low, easy to cause indigestion, you must add vitamins, fish essence and other nutrients, avoid feeding more fat feed. In summer, attention should be paid to the observation of the pond water temperature. If the water temperature is close to or reaches 26°C, cooling measures should be taken in time. Since the density is large in the later period of breeding, the amount of water to be changed and the smooth flowing water must be injected. In particular, it is necessary to increase the amount of water injection when feeding, and it can be listed when the individual reaches 100 grams or more.
Fourth, fish disease prevention
In the spring and autumn water temperature 15 ~ 20 °C prone to water blight, should try to avoid fish injuries in handling operations, treatment can be used per cubic meter of water 5 grams of malachite green Quanchiposa. In rainy days, when the water temperature drops, the amount of feeding should be reduced to prevent intestinal inflammation. During the high-temperature season from June to September, hemorrhagic diseases are prone to occur. The temperature should be reduced in time, and the reduction of bait and food should be prevented. During the treatment, chlorine-containing disinfectant should be used to hang the loquat, and Oral Administration, Fish and Liver-nourishing, and multi-vitamins should be used. The effect is better.
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