1, water temperature rises: Fish lives in water, as poikilotherm, its ability to adapt to water temperature is not strong, if the temperature rises suddenly, the melanin around the fish eye will increase. This situation is not a big problem, as long as the temperature is stable, after 15-20 days or so, the fish will recover on their own, there will be no damage.
2, the light is weak: Usually the tank used for fish farming will not be placed in the sun, because too strong light will lead to algae outbreaks, but also not conducive to stabilizing the water temperature. But if you live in a low-light environment for a long time, the eyes of fish will turn black. To avoid this, you can put an aquarium lamp in the fish tank to provide 4-10 hours of light every day.
3. Caused by disease: If a fish suffers from black spot disease, its eyes will also turn black, and all parts of the body will turn black except the eyes. This disease needs to be treated in time, otherwise it will cause blindness and even endanger the life of the fish.
with the black eyes of fish? After the eyes of fish turn black, first of all, we should change the water properly, so as to improve the water environment and reduce the content of harmful substances in the water. After that, the water temperature should be stabilized. If the temperature is too high, the temperature will be lowered. If the temperature is too low, the temperature will be raised. However, the temperature change should be controlled within 2 degrees Celsius every day. If the fish's condition does not improve, it may be caused by disease, which requires drug immersion treatment.
