Buy seven kinds of crab crabs carefully
1. Non-Changjiang River crab seed should not be bought. If Liao, Zhe, and Sui crab seedlings are cultured in the Yangtze River system, the results will be slow, precocity, small individuals, severe deaths, and low catch rates. The shape of these seedlings approximates the radius (Changjiang Crab Ellipse), the color of the dorsal armor is grayish yellow, the belly is grayish yellow and has a brass rust color (Changjiang crab silvery white), and the frontal teeth are small and blunt.
2. Crabs that have not been completely desalted should not be bought. Crabs that have been desiccated for a long time (more than 5 days) should be purchased. In addition to asking the nursery units carefully, the following methods can also be used to judge: more destined seedling impurities and dead seedlings; the color is not tan, with a white clip; use your fingers to hold the crab seedlings for 3 to 5 seconds after , Activities are not comfortable, crawling powerless or "dead".
3. Precocious crab seed should not be bought. Some crabs are small (some are only 25 grams), but the gonads have matured and the osmotic pressure in the body has risen. They cannot adapt to the freshwater environment. They will gradually die after the first spring until the first time. This crab shell is dark green, male crab chewing foot thick and well-developed hair, cheliped feet, step foot healthy and powerful, female crab navel into an oval, surrounded by small black hair.
4. Small old crab seed should not be bought. Some old crabs are called lazy crabs and crabs. They have grown in fresh water and have not been able to grow up for some reason. General gonads have matured. So the back is blue and there is hair around the abdomen. Summer is easy to die, and the rate of withdrawal is very low.
5. Saltwater crab seed should not be bought. This crab grew up on the seashore. There is no obvious difference between its appearance and authentic crab species. However, if saltwater crabs are put in fresh water for some time, some will die, some will have no power to crawl, and others will change their body color.
6. Diseases and residual crab seedlings should not be bought. Diseased crabs have weakness in limbs, dull movements, little foam in the mouth after entering the water, and sometimes small white spots on the abdomen, and less limbs, less limbs, or other injuries. Diseases and crabs are not easy to raise and manage. Although the broken limb crabs can regenerate new feet, the grade of goods has declined.
7. The crab must not be bought. Along the coast of the river, it is also called iron crabs, oysters and so on. There are many freshwater rivers, and they grow little (up to 50g), which is of poor quality. Due to its larval shape and mitten crab mimicking, so many people are often caught in a mess. With a little attention, it is not difficult to find: The crabs of the archaeopterygium have a square back, and they have short and fine fluff and a lighter color.
The vast number of crab farmers should be more discriminating and careful when purchasing crab seedlings to prevent irreparable economic losses.
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