bannerfish

From banner +‎ fish.

bannerfish (plural bannerfishes or bannerfish)

1. A large sailfish of the species Istiophorus platypterus, of the swordfish family, with a broad banner-like dorsal fin

   Synonym: Indo-Pacific sailfish

2. Any of several species of butterflyfish in the genus Heniochus (order Chaetodontiformes) that superficially resemble the Moorish idol (Zanclus cornutus, order Acanthuriformes), though not closely related.

• “bannerfish”, in OneLook Dictionary Search.
•   bannerfish on Wikipedia.Wikipedia