What are the precautions for feeding river shrimp?
River shrimp, with tender flesh, delicious taste and high nutritional value, is one of the aquatic products deeply loved by the general public, and in recent years its price has remained high with strong market demand. River shrimp farming has very particular requirements for feeding, so let us look at the following precautions:
1. Scientifically determine the feeding amount: set up feeding platforms around the pond, and when feeding, evenly sprinkle the feed on the platforms around the pond. Check the feeding situation of the river shrimp 2 hours after feeding. If there is leftover feed, reduce the feeding amount; if there is no leftover feed, increase the feeding amount.
2. Feed according to water temperature, weather, water quality and the growth condition of the river shrimp: feed less when the water temperature is below 18 degrees C or above 32~C, and feed more at 25-30 degrees C; feed more when the weather is clear, the wind is gentle and the sun is warm; feed less or not at all when the weather is bad, with continuous rain, muggy weather or a cold wave; when the water quality is fresh and dissolved oxygen is sufficient, the shrimp feed actively and can be fed normally; when the water quality is poor and dissolved oxygen is low, feed less or not at all; when the river shrimp grow vigorously and have no disease, feed appropriately more, otherwise feed less; feed less when the shrimp molt in large numbers, and feed more one day after molting.
3. Feed according to the different growth and development stages of the river shrimp: from after being put into the pond until reaching a body length of 3 cm, generally rely mainly on natural feed, supplemented by feed made from a mixture of soybean ground into slurry and small miscellaneous fish crushed into slurry. When the body length is above 3 cm, rely mainly on artificial feed, combined with soybean cake, rice bran and green feed.
4. The artificial compound feed for river shrimp is best made into granules, and powder form should not be used.
5. Adhere to the principle of small amounts and multiple times: generally at 8:00 feed 20% of the daily feeding amount, at 16:00 feed 20%, and at 20:00 feed 60%.
River shrimp have an omnivorous diet. During artificial rearing, various artificial feeds can be fed, such as silkworm pupae, fly maggots and fish meal, while plant-based feeds include soybean cake, rice bran, wheat bran and distiller's grains. The feeding time is best at 5 p.m., and the feed can be evenly sprinkled around the shrimp pond in an appropriate amount, so as to prevent the river shrimp from killing each other due to hunger.
To artificially farm river shrimp, a shrimp pond must be built. An ordinary fish pond can be used, with an area of 2-6 mu, a water depth of 1.2-1.5 m, a flat muddy sand bottom, and not too much silt. The shrimp pond should be close to a water source and convenient for irrigation and drainage. River shrimp have poor swimming ability, so some submerged plants such as algae should be grown in the shrimp pond to provide habitat for the shrimp, but the area should not exceed 25% of the water area. Branches can also be placed to provide hiding places for the shrimp and prevent losses of shrimp fry. The river shrimp pond should be patrolled and managed more often at ordinary times to prevent the pond ridge from collapsing or leaking, or water birds and water rats from preying on the river shrimp. Once a large number of young shrimp are found jumping, swimming on the water surface, or lying at the edge of the pond, it indicates that the dissolved oxygen in the water is low and the metabolites are high, which will cause mass death of the river shrimp, and the water must be changed and oxygen increased immediately.