Millions of turtles believed to have died as fishing bycatch in last 20 years . New research looks at effects of longlines , gillnets and nets on turtles . Central and eastern Atlantic are areas with most threatened turtle populations .
Millions of turtles believed to have died as fishing bycatch in last 20 years . New report looked at impact of longlines , gillnets and trawls on turtles . Mediterranean and eastern Pacific are areas with most threatened turtle populations .