Only a few fish can do this, likeChinese sturgeon, eel,salmon.
1. Chinese sturgeon
The Chinese sturgeon lives in rivers and offshore waters. It is a bottom-dwelling fish and is migratory or semi-migratory. They like to congregate at river mouths from May to June in spring and summer, and move up the upper reaches of rivers in autumn.
2. Eel
Eel is a warm temperature river migratory fish with a growth and fattening period of 5 to 8 years and begins to mature sexually. Spawners move from fresh water to the estuary in late fall and early winter, then migrate to the sea to spawn. After entering the sea, the gonads develop rapidly to maturity.
The spawning ground is located in the deep waters of southern Taiwan, China. Hatched eels drift with the currentsmarine, changing from larvae to flat willows and linear eels before entering the estuary.
3. Salmon
Salmon is an anadromous, cold-water spawning and migratory fish. Young fish live in the ocean for 3 to 5 years and usually reach the age of 4 years. are sexually mature and return to rivers to lay their eggs.
Salmon live mainly in the ocean in spring. At this time, the body color is gray and silvery white, without spots, or dotted with small black spots, and there are inconspicuous large black or brown spots. on both sides; As soon as the male fish enters the breeding period and migrates into the river in autumn, the body color of the male fish gradually changes to dark red or dark black, with 8 to 12 red-orange horizontal stripes of different shades. on the side of the body.
Detailed information:
Eel ist a carnivorous fish, feeding mainly on snails and razor clams. , crabs, shrimps, copepods and aquatic insects. Food items vary greatly at different growth stages.
White eel fry feed mainly on rotifers, cladocerans, water worms, aquatic insect larvae, shell residues and organic debris. It is widely distributed in the fresh waters of the western Pacific between Hokkaido, Japan and the Philippines, including large and small rivers and streams flowing into the Pacific Ocean from the islands and the Asian continent.
In China, it is distributed along the coasts and rivers of the Bohai Sea, Yellow Sea, East China Sea and South China Sea. It is also distributed in various estuary areas and in the middle and lower reaches. from Taiwan.
Baidu Encyclopedia – Chinese Sturgeon
Baidu Encyclopedia – Eel
Baidu Encyclopedia – Salmon