noun. Any fish (or other creatures) that are not targeted as a catch but are unintentionally caught, and often discarded back into the sea.

verb. To catch unintentionally while fishing for something else.

noun. unwanted marine creatures that are caught in the nets while fishing for another species

"The organisation wants to call attention to the problem of dolphin bycatch in fishing nets and wants to inspire people to adopt endangered dolphins from the north sea."

marine animal  marine creature  sea animal  sea creature