? Manlongyu is an upper fish. They like to move in the upper waters, and they can come out of the water to breathe after lack of oxygen in the water. Especially young fish, they often swim to the surface to swallow air, which looks funny and cute. Therefore, Manong fish belongs to the standard upper layer fish. Manarowana is mainly distributed in Peninsular Malaysia, Indonesia, Thailand and other regions. It has a mild personality, bright body color, and strong adaptability, and is favored by many fish farmers in China.
? 1. The upper fish and the lower fish live in different waters. The upper fish usually move near the surface of the water and sometimes surface to breathe fresh air. Underwater fish, on the other hand, are always at the bottom of the water, and if there is enough dissolved oxygen in the water, they will not rise to the surface. Even if there is less oxygen in the water, they will return to the bottom immediately after swimming to the surface for air.
2. The mouth of the upper layer fish is upturned, and their lower jaw is longer than their upper jaw. Because they eat some food on the top or on the surface of the water, their mouths are turned up. The more common ones are guppy, Mary fish, zebrafish and so on. The lower jaw of the mouth of the lower layer fish is shorter than the upper jaw, because they eat with their mouth downward. The more common underlayer fish are scavengers, mouse fish and so on.
