arowana is a common ornamental fish. Like most animals, arowana need to sleep. In the process of sleeping, it can also alleviate fatigue. However, arowana and other fish are relatively low animals, their brain capacity is not large. So, compared with mammals, they all need sleep, but they don't need much sleep. Moreover, their sleep state is relatively light, so it is not easy to observe their sleep state at ordinary times.
understand the arowana need to sleep, then the problem is how it sleep. As we all know, arowana and other fish have no eyelids. So, even when they're sleeping, they keep their eyes open. In general, they don't sleep in the light. At night, when the light is low, they will look for a safe place to stay, such as in the water grass or the corner of the fish tank. At this time, their activity will also be reduced, swimming more slowly, will enter the state of sleep.
When they sleep, they will not completely suspend their activities, their bodies will slightly swing, fins, gills will also slightly move, but at this time the metabolism will be relatively slow, in order to restore physical strength, alleviate fatigue. Usually careful observation, will also observe the arowana sleep. Moreover, arowana may also sleep at a fixed time.
