The anus of the fish may protrude a little, and a thin threadlike worm will drift out of the
anus. The fish becomes listless and bloated. It refuses to feed. Anti-worm medication
developed for aquariums are usually affective against nematode worms. Nematodes are
commonly present even in healthy fish, but can turn into a problem when the fish
becomes weakened due to some other reason.
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