1. The larva of eel is about 6 cm long and weighs 0. 1 g, but its head is narrow, its body is tall, thin and transparent as leaves, so it is called "willow fish". Its body fluid is almost the same as seawater, so it can be transported over a long distance by ocean currents with no effort. It takes about half a year to drift back from the spawning ground to the Kuroshio warm current and then to the seaside of Taiwan Province Province, and it begins to transform into a slender and transparent eel line, also called glass fish, one month before reaching the shore.

Catfish is very long, with a flat head and a flat tail. The mouth is low, the mouth crack is small, and the end only reaches below the leading edge. Mandibular protrusion. The teeth are thin and fluffy, and the jaw teeth and pear teeth are arranged in arc bands. The tooth bands of pear bones are continuous, and the middle part of the trailing edge is slightly concave. Small eyes and thick skin. Adult fish have 2 pairs of 4 whiskers, the upper jaw can reach the end of pectoral fin and the lower jaw is short. There are three pairs of chin whiskers in the larval stage, and when the body length is about 60 mm, 1 pair of chin whiskers begin to disappear.

Second, the distribution range is different.

Eels are mainly distributed in the Yangtze River, Minjiang River, Pearl River Basin, Hainan Island and rivers and lakes in China. Eels all over the world mainly grow in tropical and temperate waters. Except European eel and European eel, they are all distributed in Indian Ocean and Pacific Ocean.

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

Third, different living habits.

Eels like to live in clean and pollution-free waters and are the purest aquatic creatures in the world. Eels grow in rivers on land, and when they mature, they migrate to spawning sites in the ocean to lay eggs. They only lay eggs once in their lives and die after laying eggs.

This lifestyle, contrary to the anadromous salmon, is called anadromous salmon. Its life history is divided into six different development stages, and in order to adapt to different environments, the body shape and body color of different stages have changed greatly: egg stage: located in deep-sea spawning ground.

2. Catfish mainly live in rivers, lakes, reservoirs and potholes, mostly in coastal areas, hiding in grass, rocks or deep water during the day and foraging frequently at night. Living in deep water or mud for the winter after autumn, the degree of food intake is also weakened. Carnivorous fish mainly prey on small fish, such as rice sticks, crucian carp, goby fish, ear fish, carp, loach and so on. And eat shrimp and aquatic insects. Mainly swallowing, the role of teeth is mainly to prevent food from escaping.

Baidu Encyclopedia-Eel (Eel Head Snake Fish)

Baidu encyclopedia-catfish (fish name)