Atractosteus spatula: Is the largest of seven species of gar eels in North America, growing up to 3 meters. The body is elongated, and the upper and lower jaws are also long. The mouth is deep and has sharp teeth. The dorsal and fins are opposite and located at the back of the body; there are no adipid fins; the ventral fins are ventral. Each fin has no hard spines. The side lines are complete. The bladder has a maw tube connected to the back of the esophagus, the bladder has many compartments, shaped like a lung, and the wall of the bladder is densely covered with microvascular vessels, which can be metabolized by gas
Scavenger fish is native to Brazil and Venezuela, belongs to the catfish family, also known as sucker fish, garbage fish, anglerfish, almost as long as there is water can survive. They are nocturnal fish and can be polycultured with healthy species of fish. It does not eat fish feed, but swims around on the bottom and sides of the tank. Often adsorbed on the wall of the aquarium or aquatic weeds, licking moss, is the best cleaner in the aquarium.
Mirror carp (scientific name: Cyprinus carpio var. specularis [1]): is a variant of the European carp, the skin is shiny, as smooth as the mirror surface and the luster is obvious, so it is called mirror carp. The body is thicker, flattened, the back of the head is raised, the head is smaller, the eyes are larger, the scales on the surface of the body are larger, arranged along the edges, there is a row of complete scales from the front of the dorsal fin to the head, there is a row of continuous complete scales on each side of the dorsal fin, there are scales at the base of each fin, and individual individuals have a few scales on the lateral line.
Tilapia, commonly known as: African crucian carp, non-crucian carp, Vietnamese fish, South Sea crucian carp and so on. Originally referred to the mouth-hatched non-crucian fish species with Mozambique as the model origin: Mozambican mouth-hatched non-crucian carp (scientific name: Oreochromis mossambicus), now a common colloquial name for several species of fish in the genus non-crucian carp and oral-hatched non-crucian carp in the family Cimboniacea; collectively known in English as Thiapia. Now it is a freshwater farmed fish cultivated by the world's aquaculture industry, and is known as one of the main sources of animal protein in the future
Pygocentrus nattereri, also known as red-bellied piranha, red-bellied goby, piranha, is a species of freshwater fish in the order Lipidopteridae, Lipidopteridae, subfamily Sawfish, and the rump-point carp is a freshwater fish. It is distributed in the gentle flow of the Amazon Basin in South America and the surrounding shallow ponds and lakes, and is extremely productive, because of the reputation of "piranha" and swept the world, is one of the most famous fish in its origin as a famous swimming fishing and edible fish, and can also be used as an ornamental fish
Egyptian bearded catfish, also known as leather beard catfish, Egyptian pond catfish. Native to the Nile river system in Africa, China was introduced from Egypt in 1981. Egyptian bearded catfish are widely fed, fast-growing, large, and tolerant to hypoxia. The Egyptian bearded catfish has a black body color, a total of 8 whiskers, and a flattened head.