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Detailed Guide to Identifying Eel Fry Species, Teaching You How to Tell Them Apart

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Currently, it is the eel fry flood season on the Yangtze River, and fishing boats from Jiangsu, Zhejiang, Anhui, Fujian, Shandong and other provinces and cities gather at the Yangtze River estuary to fish. Because the eel fry produced in the Yangtze River are "Japanese eel," they are superior to the "European eel" produced in France, the "American eel" produced in the United States, the "Australian eel" produced in Indonesia and Australia, and the "Philippine eel" produced in the Philippines. Not only are there obvious price differences, but they are also suitable for aquaculture in our country. To prevent farmers from being deceived when purchasing eel fry, the characteristics and identification methods of various eel fry are introduced as follows: 1. Look at body shape and body color. Japanese eel fry are

Currently, it is the eel fry flood season on the Yangtze River, and fishing boats from Jiangsu, Zhejiang, Anhui, Fujian, Shandong and other provinces and cities gather at the Yangtze River estuary to fish. Because the eel fry produced in the Yangtze River are "Japanese eel," they are superior to the "European eel" produced in France, the "American eel" produced in the United States, the "Australian eel" produced in Indonesia and Australia, and the "Philippine eel" produced in the Philippines. Not only are there obvious price differences, but they are also suitable for aquaculture in our country. To prevent farmers from being deceived when purchasing eel fry, the characteristics and identification methods of various eel fry are introduced as follows:

1. Look at body shape and body color. Japanese eel fry are long-finned, fully transparent, relatively round in body, with no melanophores on the caudal peduncle, small eyes, and a pointed and long snout; European eel fry are also long-finned, round in body, and about 250% larger than Japanese eel in individual size, with stellate melanophores on the caudal peduncle, a red line along the vertebral column extending to the tail, large eyes and a short snout, and when illuminated by light at night, the abdomen emits a bluish glow; American eel fry are short and small in body shape, with protruding and small eyes. The rest are the same as Japanese eel; Australian eel fry are relatively small in body shape, with a slightly blunt head and stellate black spots on the tail. They have 7 to 9 fewer vertebrae than Japanese eel (107 to 110 vertebrae); Philippine eel fry have stellate melanophores on the caudal peduncle, and the rest are the same as Japanese eel.

2. Look at activity. When placed on the palm, Japanese eel immediately bends and jumps rapidly left and right and up and down, and after feeding stimulation quickly gathers together to eat. When grown to about 2 grams, a melanin ring appears at the end of the caudal peduncle; European eel can only bend flatly left and right on the palm, with its head raised and moving like a snake. Its feeding is less vigorous than Japanese eel, it grows slowly, is afraid of heat, and easily dies above 27°C; American eel is similar to Japanese eel; Australian eel has a strong feeding ability, is as greedy as grass carp, easily overeats and dies, and has a low survival rate; Philippine eel is large in individual size, and aquaculture has not yet been carried out in our country to date.

3. Look at the reaction in butylene solution. Japanese eel placed in 0.4 ppm butylene solution for more than 1 hour will not die. However, fry of other species will die within 1 hour.

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