Non‑target species
Species that are incidentally captured while fishing for a target species. In tropical tuna fishing, these generally include minor tuna species (bullet and frigate tunas, Pacific black skipjack, little tunny), other bony fishes (mahi‑mahi, rainbow runner, billfishes), sharks, rays, turtles, etc. Some of these species can be targeted opportunistically during a fishing trip.
See also Bycatch, Byproduct and Discard.
https://www.iss-foundation.org/tuna-stocks-and-management/our-media-library/infographics/download-info/non-target-species-caught-in-tuna-fisheries/