Answer: Non target fish populations have declined.
Explanation: Bycatch is the fish or other marine animals that are caught unintentionally when specific fish and/or size is targeted. Bycatch are usually thrown back into the water though most may have died or badly injured. Bycatch can be a different species, a different sex or even a different size of the same targeted specie.
It is estimated that about 40% of all fish caught worldwide is bycatch and this greatly impacts ocean health and decimates populations of unintentional species caught.
Bycatch of marine sponges and coral may damage protected corals and negatively impact fish habitat.