Living in the river, it looks like a crayfish, but the tail is very long, the head-to-tail ratio is equal, there is a pair of large pliers on the front of the head, the male cockroach has thick and very powerful feet, and the female is slightly smaller. When the hornfly was alive, it was blue and smooth in appearance, and when it was ripe, it became a bright red, which was very beautiful and tasted quite delicious.
The lame has a hard outer bone arm, commonly known as a hard shell. The whole body consists of the cephalothorax and abdomen. The head, covered with cephalothorax, has an arc-shaped transverse groove in the middle, called the neck groove, which is the dividing line between the head and the thorax. In front of the cephalothorax is a frontal sword, triangular in shape, with a tooth-like protrusion at the edge. There are 5 pairs of footlets on both sides of the ventral surface of the thorax, and it is very special that the first 3 pairs of footlets have claws (like vise), and the first pair of footlets is very developed. The abdomen consists of 6 segments, with 5 pairs of swimming feet on the ventral surface, and the last segment is called the tail limb, which is a tail fan. It is interesting to hunt with 3 pairs of claws, and then use the claws to bring the food into the mouth.
The difference between a cockroach and a crayfish
1, the shell of the crayfish is brownish red, and the shell of the cockroach is turquoise.
2, the shell of the crayfish has obvious nail spines and protrusions, while the appearance of the cockroach is smooth and there are no obvious bumps and nail spines.
3, the parapods of crayfish are short and thick, and the parapods of the cockroaches are slender.
4, the head of the crayfish is large, and the tail of the cockroach is large.
5, crayfish earthy taste rich and fragrant, the taste of the cockroach is delicious and slightly sweet.
6, the first pair of crayfish claws are mostly slender and have obvious nail spines, while the cockroaches are smooth and full and round.
7, crayfish on the habitat water environment is not high, many slightly polluted field ditches in the south can survive normally, the earthworm requires habitat conditions are almost harsh, any pollution will cause death and extinction, especially sensitive to chemical pesticide fertilizers.
China's vast seas, many rivers and lakes, rich in freshwater shrimp, but the beetle due to the harsh living environment, due to human intervention and the use of pesticides, the slugs are endangered, 3 of the 4 species of chinese butterflies are only in northern Liaoning, Jilin Changbai Mountain and a few streams in Heilongjiang Daxinganling and Hulunbuir can still be found.
The cockroach likes living water, need to keep the water flow clean and fluid, the water source requirements are more demanding, there are wild stream experiments after the release of survival cases, and the crab shrimp is different from the crab shrimp is very sensitive to environmental changes, the wild catch of the cockroach into the fish tank basically no longer eat, does not have artificial breeding conditions