belonging or pertaining to the Acanthopterygii (Acanthopteri), the group of spiny-finned fishes, including the bass and perch.
an acanthopterygian fish.
Historical Examples

acanthopterygian, ak-an-thop-tėr-ij′i-an, adj. having spiny fins.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various

of, relating to, or belonging to the Acanthopterygii, a large group of teleost fishes having spiny fin rays. The group includes most saltwater bony fishes
any fish belonging to the Acanthopterygii
Any of a large group of teleost fishes of the superorder Acanthopterygii, having spiny rays in the dorsal and anal fins and including the bass, perch, mackerel, and swordfish.

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