NAVLE® Question of the day

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July 9, 2025

NAVLE

A hobbyist fish owner is concerned because, within just a few hours, many of the fish in his freshwater tank have developed cloudy eyes, increased mucus, and are gasping at the surface. Fish also seem to be moving slowly.

Based on this history, which of the following would be the most relevant question to ask?

A - Do you feed frozen or live brine shrimp or bloodworms, and if so, a) how often are these fed and b) are they rinsed prior to use?

B - Did you use chlorine or other chemicals near the tank/equipment or do a recent water change with tap water?

C - Were these fish treated with ivermectin, levamisole, or praziquantel?

D - How often do you measure ammonia levels in the tank water and what was the last reading?

E - What are the levels of vitamin A, thiamine, and vitamin E in the feed, and how do you store the feed?