Robust fish species are an important basis for raising adult fish production, and they are also one of the main conditions for improving the survival rate of fish species. There are five main criteria for distinguishing the quality of fingerlings, which can be summarized as “four-by-one sampling”.
It can be seen that the pond size is not uniform. In the same fish species, the specifications of the ponds are uniform and the physical constitution is relatively strong. However, if individuals have large differences, the survival rate of the groups is often low.
Second look at the color of fish species. The color of the fish species reflects the pros and cons of the fish species, and different fish species have different body colors. In general, the body color of high-quality grass carp is light golden yellow, and grayish-black scales are more obvious. The more robust the fish, the lighter the golden yellow
Significant. The body color of the high-quality green fish species is white and gray, and the more robust the fish body, the lighter the body color. The back of the quality carp species is silver-gray, with silvery white on both sides of the body and abdomen. The body of high-quality squid species is mostly light golden yellow, and body dark spots are not obvious. If the body color is dark or black, it means that the fish are lean fish or sick fish.
Third, whether the body surface is shiny. The robust fish species is a thin layer of mucus used to protect the scales and skin from invasion by pathogens, so the body surface shows a certain degree of luster. The diseased and weakly injured fish species lack mucus and are dull. Some diseased fish have too much mucus and they lose their luster.
Fourth, look at the activities of fish species. Robust fish
This kind of swimming activity is strong and it has a strong anti-water repellency. When the cage or living water is crowded, the species heads down and only the fish tails are constantly flapping. Those fish species that are slow in swimming and poor in water repellency belong to sick and weak fish species.
One sample. It is to check the growth of fingerlings. The growth of body length and body weight of fish is generally corresponding. However, under the same feeding conditions, the same fish may have the same body length, but the weight may be slightly different. It is a fish species that becomes thinner when the food is insufficient or becomes ill. The difference in body weight is even greater. Therefore, the quality of fingerlings can be identified based on the relationship between body length and body weight. Taking mackerel and grass carp as an example, there are 37 high-quality species with a body length of 8 cm, 37 per kilogram; high-quality species with a body length of 10 cm, 25 per kilogram; high-quality species with a body length of 13 cm, per kilogram 10 tails; high-quality fingerlings with a body length of 17 cm, with 5 tails per kilogram. In general, the relationship between body length and body weight in accordance with the above criteria is of high quality fish species, otherwise it is a poor quality species.
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