There are many types of fish in the world. It is estimated that there are more than 30,000 known species of fish, and many new species are constantly being discovered. Fishes are the largest group of vertebrates and are widely distributed in marine, freshwater and some terrestrial environments. Fish are divided into several orders, suborders, and families. Here is a brief introduction to some of the main fish species:
Jawless fish (Agnatha): Jawless fish are the oldest fish, such as eels and kingfish, which have no jawbones and jaws.
Chondrichthyes: Chondrichthyes include sharks, rays, and rough-finned rays. Their bones are cartilaginous rather than hard bone.
Actinopterygii: This is the largest group of fish, including most modern fish, such as carp, perch, salmon, etc. Their fins are supported by hard rays.
Lungfish (Dipnoi): Lungfish are a special group of fish that breathe underwater through their gills, but can also breathe in the air.
Cylostomata: Cylostomata is a type of fish with a naked body and no scales. In its mature stage, it will fix its body in one place to absorb nutrients.
These are just a few of the fish species, and each category contains many different genera and species. Fishes vary greatly in shape, living habits and habitats, from tiny cichlids to gigantic whale sharks, from deep-sea mantis shrimps to alpine goldfish. Different types of fish play important ecological roles in nature, and the rich and diverse fish species also provide abundant food resources for humans.
animal tags： fish
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