? Loach is widely distributed in China and can be seen in many places. In general, they belong to the phylum Chordata, which is a vertebrate. Compared with invertebrates, they are more advanced animals, and their body structure and regulation mechanism are more complex. Mollusks, on the other hand, refer to a large group of invertebrates, also known as "shellfish". As invertebrates, they are relatively lower animals, and their body structure is not complicated. Therefore, as a vertebrate, it is impossible for loach to belong to mollusk.
Specifically, loach belongs to the order Cypriniformes of Osteichthyes, which is a kind of fish. Loaches are different from mollusks in many ways. From the appearance, a common feature of mollusks is that they have shells or mantle, while loaches do not have this structure. Similarly, loaches have fins and other fish-specific structures that mollusks do not have. In terms of the way they move, loaches use their fins to move, while mollusks have special feet, which are their typical motor organs.
? As mentioned above, loach belongs to the class Osteichthyes of the phylum Chordata, from which we can see that they belong to vertebrates as well as fish. Although the appearance of loach is not particularly similar to that of common fish, as one of the fish, they also have some key characteristics. From the body structure and appearance, loach also has fins, which need to be used to move. From the point of view of breathing mode, loach, like other fish, uses gills to breathe. Moreover, from the point of view of reproductive mode, fish adopt oviparous reproductive mode, and loach also conforms to this characteristic. It can be seen that loach is a typical fish.
