A look at the specifications of fish species

The specifications for the outlet of the same fish pond with the same type of fish should be neat and uniform, and the body length and weight should be similar. 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.

Second look at the color of 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 is dark in color, it is even blackish-black, indicating that the fish is a weak fry or diseased fish; the glossiness of the fish body is caused by the mucus layer covered by the fish body, and it is rich in protease and lysozyme. Enzymes, etc., have the function of protecting the scales of fish and protecting the skin from pests and diseases, and are the first barriers for the fish to defend itself against diseases. The diseased fish or the weak fish seedling lacks a mucus layer and is dull on the body surface. Of course, when the fish species is attacked by external pests and diseases, it also secretes a lot of mucus and loses its 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.

Three to see the activities of fish species

High-quality fingerlings are lively and actionable, and they are clustered. When they are frightened, they quickly swarm into the bottom of the water. They have strong grabbing power and strong anti-feeding ability. When the fishes are crowded, their heads are facing downwards. Only the fish tails can only be seen swinging, and their constitution is poor. The weak fish fry or diseased fish are slow in action, do not cluster, travel alone, have weak grab power and poor water reversibility.

Four sampling

Randomly selected fish species to check their pros and cons, high-quality fish species jumped violently from the water, individual fat, head and back thick, body color smooth, muscle moisture, scales, fins intact, cover squat, tail does not bend There are no parasites and scars on the body surface, and the body shape is normal without any deformity. On the contrary, weak fry 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", "sticky net" and so on.

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