See the specification of the fish species. The specifications of the same fish pond should be neat and uniform. The body length and weight are almost the same. On the contrary, individuals have large gaps. Infrequently-differentiated poor quality fish species often cause low overall survival rates due to reasons such as catching food, mixed germplasm, and poor management.
Look at the color of the fish species and the quality of the fish is bright and shiny. Different species and different culture methods have different body colors. In general, the back of a quality salmon species should be silver-gray, and the body side and abdomen should be silver-white. The body color of high-quality grass carp is light golden yellow, grayish-black reticular scales are more obvious, and the more robust the fish, the more obvious the pale golden yellow. The body color of high-quality squid species is mostly pale golden yellow, and body black spots are not very obvious. If the fish body is darker or even blackish, it means that the fish is a weak or sick fish.
Look at the activities of fish species High-quality fingerlings are lively, clustered, and quickly swarm into the bottom of the water when frightened. They have strong grabbing power and strong water repellency. When the fishes are crowded, their heads face downwards, and only the fish tails can only be seen swinging. However, the weak or sick fish with poor constitution are slow to move, do not cluster, travel alone, have weak food intake and poor water repellency.
Randomly selected fish samples were taken to check their pros and cons. The high-quality fish species jumps violently when they leave the water, the individual is fat, the head is small, the back is thick, the body color is smooth, the muscles are moist, the scales and fins are intact, the lid is not splayed, the tail is not bent, and the surface is free of parasites and scars. Body shape normal without deformity. On the contrary, weak or sick fish activities jump weakly, scales, fins are incomplete, there is congestion, the fish is thin and thin, the head is large and small, the back is thin like a blade, and even "no belly" and "sticky net".
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