Nowadays, many people in society will get a big fish tank at home to raise fish. Moreover, raising fish at home cannot be a pool of stagnant water, and it is necessary to keep the water flowing; Also pay attention to fish and quantity, choose some fish with good meaning, such as goldfish, which means prosperous wealth; At the same time, the fish shortage should be appropriate, neither too big nor too small, and should be selected according to needs and placed in the right position.
Data expansion: Hexagonal arowana has no forehead scale arc and double concave vertebral body. The costal groove on the side of the body is obvious, and the blunt salamander has a wide head, small eyes and a large tongue, and only two sides are free. The vomeroid teeth are arranged horizontally, some are far apart, and some are "M"-shaped. Widely distributed, north to southeastern Alaska and south to the Mexican Plateau.