CATDOLL : CATDOLL: How many species of freshwater fish are there on Earth?

1. How many species of freshwater fish are there on Earth?

There are about 8,600 species of freshwater fish. There are nearly 3,000 species of fish in my country, of which about 1,000 are freshwater fish. Freshwater fish are the most common freshwater organisms and the largest category of vertebrates. They are fish that live in freshwater. The freshwater area on the earth is small, but the species of freshwater fish are extremely rich, accounting for 41.2% of the total fish and about 48.1% of the total number of vertebrates. There are about 28,000 species of fish in the world (more than 26,000 species have been recorded), and about 10,700 species of freshwater fish. Although the total number is less than that of marine fish, freshwater waters only account for 2.5% of the total waters, so freshwater fish are much richer than marine fish. On average, each marine fish can inhabit 7,500 times more water than freshwater fish.

2. What is the most ferocious freshwater fish?

Red-bellied piranhas can bite through wires and attack in groups. They are known as the wolves of the water. They kill by biting.

Those that swallow belong to the catfish family. They hunt at night and swallow with their big mouths. My 60-centimeter rich cat swallowed a 25-centimeter tiger-skin duck-billed catfish alive. It can grow to more than 1 meter.

If you want to know the most ferocious large freshwater fish in nature, it is the American walrus, which belongs to the family of dragon fish and can grow to more than 4 meters, or the legendary water monster in Kanas Lake in Xinjiang. The Taimen salmon is a kind of ancient fish that survives. There is no image data that can grow to more than 10 meters.

3. Four major categories of freshwater organisms

Freshwater fish: black carp, grass carp, silver carp, bighead carp, etc.;

Arthropods: crabs, shrimps, etc.;

Molluscs: snails, clams, etc.;

Amphibians: frogs, giant salamanders, etc.

4. How many kinds of animals are there in the world?

Water animals! Land animals! Birds! Amphibians! 4 kinds of animals!