Live eel detection

Anguilla japonica (scientific name: Anguilla japonica) is a fish of the family Anguillidae and genus Anguilla. The body is elongated and serpentine, with a flattened tail. The head is large and blunt in shape. The mouth is large and open at the snout, slightly inclined and reaching below the posterior edge of the eye; The lower jaw protrudes slightly from the upper jaw. The dorsal and anal fins are both low and flat, extending all the way to the tail, connected to the caudal fin and not easily distinguishable from each other; The distance from the starting point of the dorsal fin to the starting point of the anal fin is shorter than the head length, and the distance from the starting point of the dorsal fin to the anus is about 9% of the body length; Without abdominal fins; The pectoral fin is located behind the operculum and is slightly circular. The scales are small and buried beneath the skin. The number of vertebrae is 112-119. There are no patterns on the surface of the body, the back of the body is dark gray with a hint of green, and the abdomen is white. The eel is a warm temperature descending migratory fish. It usually lives in the soil caves and stone crevices of rivers, lakes, reservoirs and still water ponds. It stays in the daytime and rises at night. Sometimes it swims from the water to the land to breathe with its skin, and then migrates to other waters through wet grasslands. Anguilla is a carnivorous fish that mainly feeds on snails, razor clams, crabs, shrimp, copepods, and aquatic insects. There are significant changes in the feeding targets during different growth stages. The white eel larvae mainly feed on rotifers, cladocerans, water worms, aquatic insect larvae, shellfish residues, and organic debris. Widely distributed in the freshwater domain of the Western Pacific between Hokkaido, Japan and the Philippines, including islands and large and small rivers and streams flowing into the Pacific Ocean from the Asian continent. Distributed in China along the Bohai Sea, Yellow Sea, East China Sea, South China Sea, and its rivers, it is found in various estuarine areas in Taiwan, as well as in the middle and lower reaches. The body length is 14.9-16.8 times the body height, 8.1-8.8 times the head length, 20.3-25.3 times the body width, 2.3-2.6 times the length of the anterior trunk of the anus, 2.9-3.5 times the anterior distance of the dorsal fin, and 17.7-30.8 times the length of the pectoral fin. The head length is 4.9 to 5.7 times the kiss length, 11.0 to 11.9 times the eye diameter, and 5.4 to 8.4 times the eye spacing. The length of the oral fissure is 1.0 to 1.2 times the width of the oral fissure. Adult fish generally have a body length of 300 millimeters, a maximum of 1.3 meters, and a weight of 5 kilograms. The body is elongated, with a cylindrical trunk and a flattened tail. The head is medium-sized and conical in shape. The kiss is short and blunt. Eyes are small and ovoid. The eye spacing is wide and slightly flat. Two nostrils on each side, separated from the front and rear nostrils; The anterior nose is close to the anterior edge of the upper lip, in a short tubular shape, with the nostrils on both sides separated further; The posterior nostrils are located directly in front of the eyes, in a cracked shape; The distance between the front and rear nostrils is slightly smaller than the distance between the two front nostrils. Large mouth, end position; The oral fissure tilts slightly downwards and extends back to the lower part of the posterior edge of the eye; The lower jaw is slightly longer than the upper jaw. Teeth are small, sharp, and arranged in ribbons; The anterior part of the upper and lower jaw toothed belt is slightly wider, with 4-5 rows of teeth, gradually decreasing back to 2-3 rows; The anterior part of the vomer bone toothed belt is wide, with 5-6 rows of teeth, gradually decreasing to 2-3 rows, extending back in a thin cone shape, and reaching a position relative to the posterior end of the maxillary toothed belt. Lips are well-developed. The tongue is free and the base is attached to the floor of the mouth. The gill hole is moderately large, laterally located just below the upper corner of the pectoral fin, and is in the shape of a longitudinal vertical fissure. The anus is clearly located in front of the middle of the body. The surface of the body is covered with slender scales, with 5-6 scales arranged vertically in a cross pattern, buried beneath the skin and often covered by thick skin mucus. The lateral line hole is obvious, starting from the posterior edge of the head above the front of the pectoral fin and extending straight back to the tail end. The starting point of the dorsal fin is clearly above the far front of the anus, and the distance from its starting point to the gill hole is approximately 1.7 to 2.2 times the distance from the starting point to the anus. The distance between the starting point of the anal fin and the starting point of the dorsal fin is less than the head length. The dorsal and anal fins are well-developed and continuous with the tail. The pectoral fins are well-developed, with a nearly circular outer edge, slightly longer than the length of the oral fissure. The posterior edge of the caudal fin is blunt and pointed. The dorsal side of the liquid immersed specimen is light brownish gray, and the lower abdomen is light yellow. The edges of the dorsal and anal fins at the junction of the tail are dark black, while the pectoral fins are light yellow or light white

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