The most common and treatable fish disease in both freshwater and saltwater is Ich ( or Ick. ) However, although they have similar life cycles and symptoms, the freshwater and saltwater varieties are actually quite different, and caused by entirely different organisms. In both cases, the organism is a parasite, which has three major life stages:
a free-swimming stage where it is looking for a host
a feeding stage, where it is embedded in the host's tissues
a reproductive stage, during which it forms a cyst and drops off the host
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