A, different morphological characteristics

1, eel fish fish body length of about 6 centimeters, weighing 0.1 grams, but its head is narrow, the body is high, thin and transparent like a leaf, so it is known as "willow leaf fish". Its body fluids are almost the same as those of seawater, so it can be drifted long distances with ocean currents with little effort. It takes about half a year to drift from the spawning grounds back to the Kuroshio current and then back to the coast of Taiwan, and only a month before it reaches the shore does it begin to metamorphose into the long, slender, transparent eel threads, also known as the glassfish.

2. The catfish has an elongated body with a flat head and a laterally compressed tail. The mouth is inferior, the mouth fissure is small, and the end reaches only below the front edge of the eyes. The lower jaw is prominent. The interdental teeth are fine and fluffy, the maxillary teeth and pearly teeth are arranged in a curved band, and the pearly teeth are continuous, with the middle part of the posterior margin slightly concave. Eyes small, lenticellate. Adults have two pairs of four whiskers, the maxillary whiskers reaching the end of the pectoral fins, the mandibular whiskers shorter. Juveniles have 3 pairs of whiskers, and 1 pair of chin whiskers begins to disappear when the body grows to about 60 millimeters.

Second, the distribution range is different

1, the eel is mainly distributed in China in the Yangtze River, Minjiang River, Pearl River Basin, Hainan Island and rivers and lakes. The world's eel mainly grows in the tropical and temperate regions of the waters, in addition to the European eel (Anguilla anguilla) and the American eel (Anguilla rostrata) are distributed in the Atlantic Ocean, the rest are distributed in the Indian Ocean and the Pacific Ocean region.

2, catfish with catfish, also known as earth catfish, is the catfish family in the most widely distributed fish. It is the most widely distributed fish in the catfish family. It is distributed all over the world.

Three, different habits

1, eels like to live in clean, pollution-free waters, is the world's purest water creatures. Eels grow in land rivers and rivers, mature migrate to the ocean spawning ground spawning, a lifetime of only one egg spawning, spawning after death.

This life pattern, in contrast to the anadromous nature of salmon, is called descending migratory (Catadroumous). Its life history is divided into six different developmental stages, in order to adapt to different environments, different stages of the body size and body color are greatly changed: egg stage (Egg-stage): located in the deep sea spawning ground.

2, catfish mainly live in rivers, lakes, reservoirs, pits and ponds in the lower and middle layers, mostly in the littoral zone activities, during the day, more hidden in the grass, under the rocks or deep water bottom, night foraging activities are frequent. After the fall, it resides in deep water or sludge to overwinter, and the degree of feeding is also weakened. Carnivorous fish, predatory objects are mostly small fish, such as meal strip, crucian carp, goby, whelkfish, carp, loach, etc., but also eat shrimp and aquatic insects. Swallowing-based, the role of the teeth is mainly to prevent food from escaping.

Baidu Encyclopedia - Eel (Eel family long-striped serpentine fish)

Baidu Encyclopedia - Catfish (Fish Name)