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Tropical Fish Word of the Day: Anal fin

Expand your tropical fish vocabulary with the FishChannel.com Tropical Fish Word of the Day.

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Anal fin: (n.) A part of a fish’s anatomy. The anal fin is a single fin mounted vertically on the bottom side the fish between the anus and the caudal fin. It serves to stabilize fish while they are swimming. In some species it can also be used during breeding.

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