Shrimp is a swimming suborder of crustacean decapod, with nearly 2000 species. According to the different sources of production, shrimp can be divided into two types: seawater shrimp and freshwater shrimp. Sea shrimp, also known as red shrimp, includes lobster and prawn, among which prawn tastes the most beautiful and is a famous seafood product.
Growing environment:
Shrimp swimming is very different from fish. Fish can swim forward by swinging their tail fins. Shrimp has no tail fin like fish, only a tail and many calves. So how does it swim? Shrimp also has its "coup". Shrimp is a good swimmer and can swim long distances with its legs. When it swims, its swimming feet paddle backward frequently and neatly like wooden paddles, and its body drives forward slowly. When frightened, its abdomen bends and stretches flexibly, its tail strokes down and forward, and it can jump backwards continuously at an extremely fast speed. Some shrimps are not good at swimming, and big lobsters spend most of their time crawling on the sand and stones on the seabed.
The gills of shrimp with respiratory circulation are located in gill chambers formed on both sides of the crustacean, and the gill chambers are communicated with the outside world. Most of the branches are pinnate, with 25 pairs of * * *, which are attached to the chest side wall or the base of the chest limb. The epidermis is extremely thin, and gas exchange occurs when blood flows through gills. The jaw boat in the gill chamber swings constantly, so that fresh water enters from the back and abdomen and flows forward. The circulation system is open. The heart is a flat polygonal muscle sac located in the pericardial sinus behind the head and chest. There are four pairs of cardiac holes, two in the back, one on both sides of the posterior end and the other on the ventral side of the heart near the posterior end. There are valves that control blood flow.