Tuna, Bigeye (Maguro) – Atlantic, Longline
Bigeye Tuna are a large fish, growing to over 200 kg (440 lbs), and are found throughout the Atlantic, Pacific, and Indian Oceans. They grow reasonably fast, can release millions of eggs each year, and can live to 10 years. In the Atlantic Ocean, high fishing levels have depleted the Bigeye Tuna population.
Longlines result in large quantities of bycatch, including threatened or endangered species such as sea turtles, sharks and seabirds. With the exception of the U.S. fisheries, few regulations have been implemented to reduce negative effects on bycatch species.
When fishing for tuna, longlines do not typically contact bottom habitats. However, because these fisheries catch several top-predator species, there is some concern that these fisheries may affect ocean food webs and ecosystems.