According to the Baidu Encyclopedia, the freshwater fish without fish scales include the following:

1. Catfish, also known as bearded fish and pond fish, is distinguished by the fact that it has no scales all over its body and has It has a lot of mucus, a flat head and a wide mouth, and four beards on the upper and lower jaws. It is widely distributed and mainly produced in the Yangtze River and Pearl River basins. The best eating season is from mid-spring to mid-summer (April to July). Catfish is a carnivorous fish. Its meat is tender with few spines, rich in flavor, rich in protein and fat, and rich in nutrients. It is especially suitable for people with weak constitution and malnutrition.

2. Yellow catfish, also known as yellow catfish, yellow catfish, etc., is a common freshwater fish in the family Cataceae and the genus yellow catfish. Yellow catfish mostly inhabits the shallow waters around the lake and rivers entering the lake with slow flowing water and grass. It lives a benthic life. It especially likes to live in still water or slow flowing shoals with a lot of humus and mud. Omnivorous, they mainly feed on animal feed under natural conditions. The fry stage feeds on zooplankton. Adult fish feed on insects and their larvae, small fish, shrimps, snails and clams, etc., and also eat plant debris. Distributed in Laos, Vietnam, China, North Korea, and southeastern Siberia, Russia. In China, it is distributed in the Pearl River, Minjiang River, Xiangjiang River, Yangtze River, Yellow River, Haihe River, Songhua River and Heilongjiang river systems. Yellow catfish is rich in amino acids, has tender meat, delicious taste, high nutritional value, nourishing effect and medicinal value, and has no intermuscular spines.

3. Eel, also known as eel. The body is slender and snake-shaped, with a body length of about 20-70 cm and a length of up to 1 meter. The front of the body is round, the back is flat on the sides, and the tail is tapered. The head is long and round. The mouth is large, end-positioned, the upper jaw is slightly protruding, and the lips are well developed. There are fine teeth on the upper and lower jaws and the bones of the mouth. The eyes are small and covered by a thin skin. The head is thick and the tail is thin. The body surface is protected by a layer of smooth mucous membrane. It has no scales and is yellowish brown in color. The body has irregular dark spots. The fins are underdeveloped and have basically disappeared. There is only one triangular spine on the whole body. The spine is sparse and thick. The meat is tender and delicious.

4. Loach. Loach is a benthic fish that inhabits the bottom of rivers, lakes, ditches, paddy fields, ponds and other shallow water and silt environment waters. It is diurnal and nocturnal. It has strong adaptability and can live in an environment rich in humus. When there is a lack of oxygen in the water, it can jump to the surface of the water and swallow air for intestinal respiration. When the pool dries up, it dives into the mud. As long as the soil remains moist with a small amount of water, it will not die. Loach is widely distributed in China, Japan, North Korea, Russia and India along the Asian coast. Loach meat is thin and tough and has high nutritional value. People in Southeast Asia love food. Loach meat is delicious, rich in protein and many vitamins.