A gillnet is fishing net that consists of single, double or triple netting walls that hang in the water column, typically made of monofilament or multifilament nylon. The gear can be set, anchored to the bottom of the ocean, or be left drifting (driftnet), free or connected with the vessel.
While data analysis has proved difficult, a recent study found that bycatch from gillnet fishing is high across all species groups. Sharks were especially vulnerable, with gillnets accounting for 64 percent of shark catches recorded by the IOTC. Research also indicates that turtle mortality is high because of gillnets operating in the Indian Ocean.
There is not enough reliable data available to estimate the fuel use of gillnet fishing.
We published our findings in ISSF 2012-05: Bycatch in the Indian Ocean Gillnet Tuna Fleet. A review.