a South American characin fish, Aphyocharax rubropinnis, having a silvery body and bright red fins: popular in home aquariums.
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British Dictionary definitions for bloodfin
a silvery red-finned South American freshwater fish, Aphyocharax rubripinnis : a popular aquarium fish: family Characidae (characins)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012