Crayfish is a kind of shrimp that grows in fresh water. Crayfish has strong viability and can be found in many waters. So where does crayfish grow? Let's get to know it together.
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Crayfish has a wide adaptability and a wide suitable growth temperature, and can grow and develop normally when the water temperature is 10-30℃. It can also resist high temperature and cold, can tolerate high temperature above 40℃, and can also survive the winter safely when the temperature is below-14℃.
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Crayfish like to dig holes during the breeding season. The cave is located about 20 cm above the water surface of the pond, with a depth of 60 cm to 1.2 m. There is a small amount of water in it to keep the humidity, and the hole is generally sealed with a mud cap to reduce the water loss. In the summer night or after the rainstorm, it has the habit of climbing ashore, and can cross the dam and enter other water bodies.
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Crayfish can breed all the year round, with the peak period from May to September. Crayfish are hermaphroditic and have obvious secondary sexual characteristics. It can be distinguished from the shape of abdominal swimming limbs. The first abdominal swimming limb of male shrimp is specialized as a mating thorn, while the first abdominal swimming limb of female shrimp is specialized as a sperm hole. Secondly, there are obvious differences between the two pincers. The male pincers are thick, and there is a bright red wart on the outside of both ends of the pincers, while the female pincers are small and the wart is not obvious. Thirdly, the claw feet of male shrimp are bigger than those of female shrimp, and the individual is bigger than that of female shrimp.
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Crayfish is an omnivore. In terms of eating habits, crayfish prefer to eat mud at the bottom of the river, and they like to eat dead small fish or other aquatic creatures. It mainly eats plants, and small fish, shrimp, plankton, benthos and algae can all be used as its food.
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Because most crayfish are very anti-polluting, they can still survive in water containing highly polluting toxins. Stocking in aquariums can also effectively remove fish excreta and moss, which has a great contribution to the improvement of hydrological environment.
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