A disease caused by infection with hexamita parasites, typically affecting the digestive system of fish and aquatic animals.
From hexamita + '-iasis' (a suffix meaning disease or condition caused by). This follows the medical naming pattern for parasitic diseases like 'malaria' or 'giardiasis'.
Pet fish hobbyists have learned that hexamitiasis often kills fish before any visible symptoms appear—it's one of those infections where by the time you notice something's wrong, the parasites have already devastated the animal's gut.
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