The monofilament longline fishery started in 1994 with experimental fishing trip by SFA research vessel R/V Etelis. The trips and the technical assistance were financed by “Association Thoniére” through the project “Programme Thoniére Régional in (1992-1996)”. The aim of the experimental trips was to evaluate the potential for local investor to exploit large pelagic fish, especially Swordfish in the Seychelles EEZ using the monofilament longline fishing method. Commercial trips started in 1995.

The semi-industrial sector comprise of the monofilament longline fishery operating around the Mahe plateaux. On average these vessels remains at sea for a period of 10 days, preserving their catches on ice. This fishery has been developed with the objective of relieving pressure from demersal resources by targeting pelagic fish in deep waters outside the continental plateaux.

The semi industrial longline gear is used to target large pelagic fishes, such as broadbill swordfish (Xiphias gladius), bigeye (Thunnus obesus) and yellowfin (Thunnus albacares). For trips targeting swordfish and tuna, bycatch (species not targeted but captured) of billfishes (istiophorid) such as marlins and sailfish and other species are also caught.