more... > Diseases in Pond Fishes > Healthy fish can usually fight off diseases, but under stressful cicumstances, fish are more susceptible to those diseases.  These articles explain about fish diseases, how to recognize them, and what to do about them.  Diseases in Pond Fishes [Image: image from the first page of the document] When fish are stressed, they are more susceptible to disease. This document discusses stress and diseases that fish can contract.