Q: One of my fish isn’t swimming upright. What’s wrong?
Cherie – Englewood, CO
A: Unless you’ve taught your pond fish some pretty cool party tricks, it’s possible that they’re not getting enough oxygen due to a lack of aeration.
Fish will display some odd behaviors when they’re not getting enough oxygen, including gasping for air at the surface, hanging vertically in the water, and spending a lot of time around the waterfall or stream where oxygen levels are at their highest – at least for the few hours each day when the pump is running.
Some other telltale signs of insufficient aeration are:
- The water in your pond appears to be stagnant in certain areas
- You’ve noticed a growing mosquito problem
- Algae growth always seems to be a battle you can’t win
- Muck has accumulated at the bottom of the pond
Medical issues, like swim bladder problems, could be causing your fish to swim sideways, too. But, before you take your finned pal to the veterinarian, try adding or adjusting the aeration in your water feature. You can also check your ammonia and nitrite levels using a water test kit.
If your pond has a lot of fish for its size, or is a medium or large water garden or koi pond up to 16,000 gallons in size, consider adding an Airmax® KoiAir™ Aeration Kit. Its energy-efficient design includes a dual diaphragm pump that infuses oxygen into the pond while being virtually maintenance free.
If you have a handful of fish in a smaller pond that’s up to 2,000 gallons in size, check out the Airmax® PondAir™ Aeration Kits. It’s designed for decorative ponds and water gardens, and features an airflow control valve that allows you to adjust the aeration output with the turn of a dial.
Aeration should help your fish swim upright again. But if it’s still acting strange after you’ve pumped up the oxygen, you may want to check in with your veterinarian for medical advice. Good luck!
Pond Talk: What’s the strangest thing you’ve seen your pond fish do?
Filed under: Aeration - WG, Algae Control, Fish Diseases, Fish Population, Koi & Goldfish, Oxygen Depletion, Water Gardens & Features, Water Quality Issues, Waterfall Tagged: | Aeration, fish, gasping, goldfish, koi, swim bladder, upright