If the fish tank is always oxygenated and the fish adapt to the high oxygen environment, once the oxygenator stops working due to power failure and other reasons, the oxygen content decreases and it is easy to die. In addition, although the saturation of dissolved oxygen in water may cause symptoms such as bubble disease, it is impossible for general oxygenation equipment to make the oxygen content in water reach saturation level.
1. Floating head: The common manifestation of fish hypoxia is floating head. The so-called floating head means that the fish will gather to the upper layer of the water, or even move on the surface. If a fish floating head may be caused by poisoning or gill disease, if most of the fish are floating head, it is very likely to be hypoxia. At this time, oxygen needs to be added to the water.
2. Anorexia: When the fish is anoxic, it will show no spirit. At this time, even if it is fed with food, the fish's appetite is not strong, and it will not start grabbing food as usual. However, anorexia does not necessarily represent hypoxia, it may also be caused by gastrointestinal diseases, so we need to observe other phenomena.
3. Jumping tank: For some fish, when the oxygen in the water is insufficient, there will be the phenomenon of jumping tank. It is worth mentioning that not all fish have the ability to jump tanks, and some fish jump tanks will not be due to hypoxia, so this can not be used as a criterion for judging hypoxia, because in general, fish tanks need to be covered.
