1. Does the shrimp have hormones? 1. Does the shrimp have hormones? 1. Whether there are hormones in the shrimp is generally related to the behavior of shrimp farmers. The shrimp itself usually has no hormones, but some black-hearted businesses will use some hormones in order to make the shrimp grow bigger. However, the relevant departments in China have strict supervision on this aspect and will conduct spot checks regularly. Usually, few shrimps contain hormones. (2) When buying shrimp, you need to go to a regular place to buy it, such as a large supermarket, to ensure that the shrimp comes from a regular place of origin and has been inspected. 2. How to choose fresh shrimp (1) The head of fresh shrimp is closely connected with the body, while the shrimp body has a certain curvature, the shrimp shell and whiskers are also hard, and the eyes are more prominent. However, if the shrimps just died, their shells are soft, their eyes are concave and their shells and meat are slightly separated. If they have died for a long time, their shrimps are loose and their heads and feet have fallen off. (2) The shell of fresh shrimp is usually shiny, while the shell of stale shrimp is darker. (3) The meat quality of fresh shrimp is firm and tender, and it has certain elasticity, and there is no peculiar smell at the same time, while the meat quality of stale shrimp is usually inelastic and has some peculiar smell.
2. Species of shrimp 1. Macrobrachium nipponense (1) Macrobrachium nipponense is a kind of freshwater shrimp, which mainly lives in ponds, rivers and other places. Its body color is generally bluish-blue, mixed with brown-green stripes, and its body color will change with the quality of water environment. When the water quality is clear and transparent, its body color is usually light, and vice versa. (2) Macrobrachium nipponense is an omnivorous aquatic animal, which is partial to animal feed and has certain backlight. It will hide in the dark during the day and come out at night, but it is completely different in the reproductive season, even during the day. 2, white shrimp (1) The shrimp is called white shrimp because its shell is relatively thin and there are few pigment cells. On weekdays, the body is generally transparent, but after death, the muscles turn white. (2) White shrimp mostly lives in shallow sea, near the shore or in salty fresh water near the estuary. It is an omnivorous aquatic animal and can grow all year round, but its growth rate will slow down in winter because of the drop of water temperature, and it will accelerate again after the water temperature rises in the following spring. 3. Red-tailed shrimp (1) The body color of red-tailed shrimp is brownish yellow (relatively light), with 7-8 teeth on the upper edge of the forehead and 4-6 teeth on the lower edge, belonging to annual shrimp, and some red-tailed shrimps have a life cycle of 2 years. (2) Red-tailed shrimp has a wide range of feeding habits. In the larval development stage, it mainly feeds on unicellular algae. With the continuous growth, it mainly feeds on animal benthos. In late autumn and early winter, with the drop of water temperature, it will slowly swim to a deeper sea area for the winter. When the water temperature slowly rises in the next spring, it will begin mating and reproductive activities. 4, red shrimp (1) Red shrimp (Eriocheir sinensis) is generally 28-82mm long, reddish brown in color, with lavender spots on it, and its shell is thin and soft. It usually lives in muddy or muddy sea areas with a water depth of 25-1m m. (2) Red shrimp is a kind of shrimp with wide temperature and salinity. It mainly lives in the sea area with salinity of 3-34‰ and water temperature of 1-25 C. The catch is related to its compactness. In winter, they move to the shallow coastal areas and are densely distributed in the offshore areas, so the catch is better. After December, they will move to the sea, and the shrimp group will 5, river shrimp (1) River shrimp has a slender body shape, the length is generally 1.5-3cm, its head and chest are relatively thick, while the back is gradually thinning and narrowing. It is a high-quality freshwater shrimp, because of its tender meat, delicious taste and rich nutrition, so it is deeply welcomed by consumers. (2) Shrimp mainly inhabits aquatic algae and grass in rivers, lakes and gullies, and the temperature tolerance range is usually 1-37 C, while the temperature suitable for living is 17-32 C. If it needs to be cultured, it is recommended to cultivate it in a freshwater pond or shrimp pond with a water depth of 1.5-2.5m, abundant fresh water sources and no pollution, and a sandy bottom. 6. Prawn (1) The body of prawn (Penaeus vannamei) is relatively long and slightly flat on its side. The body color of female shrimp and male shrimp is usually somewhat different. The body color of female shrimp is generally gray-blue, while that of male shrimp is somewhat yellow. Because prawn is usually relatively large, it is also called prawn. (2) Generally, prawns can be divided into settled prawns and migratory prawns. Settled prawns mainly include Japanese prawns, European prawns, Bohai prawns, wide-ditch prawns and so on. They mainly inhabit the shallow sea along the coast, often dive into the sand bottom during the day, and generally do not move widely. Migratory shrimps mainly include Penaeus penicillatus, Penaeus vannamei and Penaeus China, which mainly inhabit the turbid sea area along the estuary and often move and migrate in a large range.