blackfin

noun
black·​fin | \ˈblak-ˌfin\
plural blackfins

Definition of blackfin 

2 : blackfin tuna Blackfins generally run smaller than the other tunas; a really large one weighs 40 pounds.— Susan Cocking, Miami Herald, 15 Apr. 2011

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First Known Use of blackfin

1875, in the meaning defined at sense 1

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The first known use of blackfin was in 1875

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