The main reasons why Tiger Fish turn black include genetic issues, environmental adaptation problems, water quality problems, and diseases.
Genetic Issues: Some Tiger Fish are born with darker body colors, which are determined by their genes. And this kind of body color won't change even if the environment is improved.
Environmental Adaptation: Tiger Fish may have their body colors turn darker when they don't adapt well to a new environment. When new fish are put into the tank, it's necessary to let them gradually adapt to the new environment and avoid directly pouring new water onto the fish to prevent discomfort.
Water Quality Problems: Changes in water quality are an important reason for Tiger Fish to turn black. Sudden changes or deterioration of water quality will make Tiger Fish feel uncomfortable, thus resulting in their body colors turning black. Pay attention to the method when changing water and avoid changing a large amount of water at once to prevent stimulating the Tiger Fish.
Diseases: Tiger Fish may turn black due to diseases, such as black spot disease. If wounds or scale loss are found on Tiger Fish, it's necessary to isolate them for breeding and conduct treatment in a timely manner.
To prevent Tiger Fish from turning black, the following measures can be taken:
Isolate for Breeding: Once it's found that Tiger Fish are injured or show abnormalities, they should be isolated for breeding in time, and salt should be added for sterilization.
Properly Increase Water Temperature: Use a heating rod to properly increase the water temperature to help Tiger Fish recover.
Pay Attention to Water Changes: Change water in small amounts and multiple times to avoid water quality changes caused by large-scale water changes.
Change Feed: Choose nutrient-rich feed and avoid feeding on single or malnourished feed for a long time.