Gasping, loss of balance, severe weakness, rapidly worsening injuries, or deaths need prompt attention. Support life support and check water while contacting a fish veterinarian. Do not wait for a default settling period or try several medicines in succession.
Protect People and Support the Fish
Keep people safe around water and electricity. Confirm aeration and circulation actually work; use the prepared backup if the main system has failed. Avoid repeated chasing or catching. Do not transfer a distressed fish into an unprepared bucket simply because it is easier to see.
Gather Immediate Information
- Note whether one fish or many are affected and when the change began.
- Check temperature, ammonia, nitrite, pH, and oxygen when available.
- Review refill, filter work, power loss, treatment, contamination, and recent arrivals.
- Contact the professional with the observations and results; do not delay severe cases until every test is complete.
Correct Water with a Suitable Plan
If replacement is needed, assess and condition the source water appropriately and avoid major temperature or chemistry changes. The amount and pace depend on the cause and both water supplies; a universal large-change instruction can create a second problem. Stopping feeding while water quality is assessed may reduce new waste, but it does not remove existing contamination.
Move Fish Only When the Destination Helps
A transfer may be necessary for an unsafe system or a directed examination, but the destination needs suitable water, space, oxygen, and containment. Handle with appropriate equipment and professional assistance where needed. Do not make salt, heating, or a dip the automatic next step.
Keep the Timeline for Follow-Up
Record tests, interventions, times, and changes. Ask how to handle any deaths and diagnostic samples before disposing of material. Pause transfers and shared equipment if infection is suspected. Use the pond emergency plan to prepare backups and troubleshooting to investigate system causes.