We Hebei Tomato Industry Co., Ltd are specializing in processing canned food for many years. We can supply you with Tomato Paste with different sizes, besides, we can do Canned Peach, Canned Pear and juice, Nata de Coco, IQF, etc. Our goods is up to international standard. we export canned peach to Japan with large quantity every year. Some African countries are our markets too.
*Related Products:canned whole peach and pear.
Canned Fruit,Canned Juice,Canned Fruit Juice,Canned Coconut Juice,Canned Peach, Canned Pear Hebei Tomato Industry Co., Ltd. , http://www.hebeitomato.com
One can see that the pond size is not the same as the same fish species, and all the ponds are evenly sized and the physique is more robust. However, if individuals have large differences, the survival rate of the groups is often low.
Second, look at the body color of fish species, may reflect the pros and cons of fish species. Different fish species have different body colors. In general, the body color of high quality grass carp is light golden yellow, and grayish-black reticular scales are more obvious. The more robust the fish, the more pronounce the pale yellow color. 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 these fish are lean fish or sick fish.
Thirdly, whether the body surface is glossy The robust fish species is a thin layer of mucus which is used to protect the scales and the skin from invading bacteria. Therefore, the body surface exhibits 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.
Four to see the activities of fish species Robust fish species lively, strong anti-water. When the cage or live 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 sampling is to check the growth of fingerlings. The growth of body length and body weight is corresponding to the general situation. However, under the same feeding conditions, the same fish may have a slight difference in body weight even though they have the same body length, especially if the food is thin or the body becomes thinner after illness. The difference in body weight will be more serious. 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 species of fish with a body length of 8 centimetres high; there are 37 species of fish with a body length of 10 centimetres high, 25 species per kilogram; and high-quality species with a body length of 13 centimetres per kilogram 10 tails; high-quality fingerlings with a body length of 17 cm, with 5 tails per kilogram. In general, the proportionate relationship between body length and body weight that meets the above criteria belongs to high quality fish species, otherwise it is poor quality fish species.
How to identify the quality of fingerlings
Robust fish species are an important basis for improving 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 samplingâ€.