Light sticks/Swordfish tears--used in the swordfish and tuna fishing industry. Fishing lines, hundreds of meters long, have hooks at intervals. Each hook has a light stick attached to it to attract the fish.
Watch the film The Perfect Storm to see light sticks being put on hooks--the scene just before one of the fishermen goes overboard
The burgeoning long-line fishing industry is now suspected to be the primary danger to sea turtle survival. Longliner ships set out fishing lines up to 75 miles (121 km) long, hung with thousands of hooks. Tens of thousands of sea turtles are snagged and drown on longlines yearly. Leatherback sea turtles in particular may be attracted to long-lines by the chemical light sticks attached to the lines, which may resemble the jellyfish that constitute their primary food.
