August 08, 2019

Keeping Lights On For Turtles

2 minutes

Gillnets are one of the most common types of fishing gear and are used extensively in most places where people fish for food. They operate by suspending a wall of netting in the water column.

Unfortunately, they are not selective in the species they catch. Sea turtles are one of the most common

bycatch species that become entangled in these nets. When turtles are caught in gillnets, they can

drown and die. Marine mammals, seabirds,

and sharks are also frequently caught in gillnets.

Recently, researchers have been experimenting with illuminating the

nets with LED lights to see if increasing net visibility reduces sea turtle

bycatch.

Studies in Mexico show green sea turtle bycatch is reduced between

40-60% with no changes in target catch.

Studies in Peru show green sea turtle bycatch is reduced between 65-80%

with no changes in target catch. Studies

in Indonesia show green olive ridley, and hawksbill sea turtle bycatch is

reduced by 60% with increases in target catch and catch value.

Recent research shows that net illumination also reduces bycatch of

other protected species such as seabirds, sharks and rays, as well as dolphins

and porpoises.

The use of illuminated gillnets could prove beneficial to both sea

turtles and fisherman by reducing the bycatch that can damage fishing

gear.

Studies are now underway off the coast of North Carolina, where state gillnet fisheries are carefully managed to reduce turtle bycatch. Initial studies show that net illumination does not change target catch rates and may even decrease the bycatch of unwanted fish species. When it comes to protecting sea turtles, it looks like a good idea to keep the lights on.

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Web Links

Illuminated Nets Could Provide A Brighter Future For Sea Turtles

Photo, posted June 2, 2016, courtesy of NOAA via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

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By Randy Simon

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