Water
Ammonia: what the reading means
Ammonia is a waste warning, not a normal result to ignore in an established fish pond.
Understand the kit
Many kits measure total ammonia rather than only the more toxic un-ionised form. Toxicity depends on factors including pH and temperature. Keep the units and kit name with the result; a number without context can be misleading.
Reduce the load
Check whether a fish has died, food is accumulating, flow has stopped or the filter was recently disturbed. Pause new stock and reassess feeding. Ensure aeration is working and seek advice about appropriately conditioned partial water changes.
Avoid a second problem
Do not make sudden pH changes or pour in several different chemicals. Read the compatibility and testing implications of any conditioner. A product that temporarily binds ammonia does not repair the cause of the waste buildup.
When it is urgent
Rapid breathing, loss of balance or several affected fish need prompt expert help. Share ammonia, nitrite, pH, temperature, volume, species and recent changes. Aim to resolve the cause before resuming normal stocking plans.
Share the kit as well as the result
Photograph the test instructions and colour chart alongside a written reading, sampling time, pH and temperature. Include recent feeding, new fish and filter maintenance when asking for help interpreting the result.
Sources & further reading
Original WakeyKoi wording, informed by the references below. Linked clinical resources explain the evidence and their scope; they have not reviewed or endorsed this website.
Related guides
Educational guidance cannot diagnose an individual fish. Breathing distress, severe injury or unexplained losses need prompt professional assessment.