Natural enemies from land. Voles, cats, dogs, otters and other carnivorous or omnivorous animals. Domestic animals include cats, dogs, cormorants, geese and ducks, which can prey on crayfish in shallow water and near the water. Cats and dogs usually don't catch crayfish for food when they have enough food. Some wild carnivores, such as otters, also go into the water at night to catch crayfish for food.
Natural enemies from the water. Both water snakes and land snakes will catch crayfish for food, especially the larger snakes like to prey on crayfish. To prevent snakes, some sulfur powder or male sulfur can be sprinkled around the culture pond, which can effectively prevent snakes from entering the shrimp pond. Carnivorous fish, such as catfish, snakehead, snakehead, perch, mandarin fish and other fierce carnivorous fish, will catch crayfish for food. Therefore, shrimp culture in ponds must eliminate carnivorous miscellaneous fish. Otters also like to catch crayfish for food in the water.
Natural enemies from the sky. Every year, when migrating to migratory birds, such as geese, swans, cranes, egrets, night herons and other larger birds and waterfowl, they like to catch crayfish in shallow waters for food. Crawfish farms can set up woven nets to protect crayfish when there are too many birds.