Why Is My Fish Coming to the Surface to Breathe?

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Fish - Behavior

Why Is My Fish Coming to the Surface to Breathe?

If there is insufficient oxygen in the water, your fish will swim to the surface because that's where the concentration of dissolved oxygen is highest. As soon as you notice most of your fish gasping for air near the surface, act immediately. This is a clear sign of distress. Exceptions are bettas and gourami, which have a labyrinth gill and breathe surface air.

Ask yourself the following questions to determine why your fish aren't getting enough oxygen.

Is the water polluted or cloudy due to overfeeding? If so, replace up to one-third of the polluted water with clean water. Remember to use the correct composition/treatment and temperature.

Are there dead fish in the tank? If so, remove them immediately and replace up to one-third of the water.

Are your aerators (airstones, bubblewands, etc.) working properly? Did your airpump malfunction? Check your equipment and tubing and adjust, repair or replace accordingly. Remember, airstones and bubblewands have relatively short lifespans and can easily get clogged with slime and algae. Always buy these products in twos or threes so you will have enough on hand when they cease to function.

Are the tank's oxygen levels, temperature and ammonia and nitrate levels in an acceptable range? Any discrepancy can upset the balance of your tank.

Has the tank been contaminated by toxic material like metal or biodegradable (water-soluble) items that may have been inadvertently introduced into the tank? If so, remove them immediately and replace up to one-third or one-half of the water as necessary.