See the fish species specifications: the same fish pond with the same kind of fish out of pond specifications should be neat, uniform, body length, weight is almost the same. On the contrary, there is a large gap between the individuals, and poor quality mixed fish species often cause low survival rates due to reasons such as catching food, mixed germplasm and poor rearing.
Look at the color of the fish species: the quality of the fish is bright and shiny. Different species and different feeding methods have different body colors. In general, the back of the quality carp species should be silver-gray, silver on the side and abdomen; the body color of the quality grass carp is light golden yellow, grayish-black reticular scales are more obvious, and the more robust the fish, the lighter The more obvious is the golden yellow color; the body color of high-quality squid species is mostly pale golden yellow, and the body's black markings are not very obvious. If the fish body color is darker or even blackish, it means that the fish species are weak fry or sick fish. The luster of fish species is due to the mucus layer covered by the body. It is rich in proteases, lysozyme, etc. It has the function of protecting fish scales and protecting the skin from diseases and insect pests. It is the first of its own defensive diseases. A barrier. The diseased fish or the weak fish fry lacks a mucus layer and is dull on the body surface. When fish species are attacked by external pests and diseases, they also secrete a lot of mucus and lose their luster. If the fish is attacked by small melon worms, the body surface will cover a thick layer of mucus, which is a kind of stress response that the fish species make to the external invasion.
Look at the activities of fish species: High-quality fingerlings are lively and vigorous, and they are clustered. They rapidly dive into the bottom of the water when they are frightened. They have strong grabbing power and strong anti-feeding ability. When the fishes are closely headed, they can only see the fish tails continuously. Oscillating, but weak physical fry or sick fish movement is slow, not clustered, solo, weak grab power, poor water resistance.
Look at the results of the random inspection: Check the quality of the fish at random and check the quality of the fish. The high-quality fish species will jump violently when they leave the water. The individual will be fat, the head will be small, the back will be thick, the body color will be smooth, the muscles will be moist, and the scales and rays will be intact. Zhang, tail does not bend, no parasites and injuries on the body surface, normal body shape without deformity. On the contrary, the weak fish fry or diseased fish jumped weakly, and the scales and fins were incomplete and congested. The fish was thin and thin, with large heads and small tails. The back was as thin as a blade, even “no belly†and “sticky netâ€.
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