Gear trials in Skagerrak A “new” pelagic grid SLU Aqua Andreas Sundelöf, Daniel Velentinsson, Hans Nilsson, Mikael Ovegård, Anders Wernbo & Joakim Hjelm SPFPO, Carmona GG 330 Swedish University of Agricultural Sciences www.slu.se
The problem • Landing obligation since 2015 • During Q3, saithe is sometime intermixed with herring in Skagerrak IIIaN • Hence, there is often bycatch of saithe in herring fishery (Aug-Sept) • No specific quota for saithe in the Swednish pelagic system Swedish University of Agricultural Sciences www.slu.se
Conditions • The SPFPO contacted SLU • Grids in pelagic gear have been used in blue whiting and Norway pout fisheries in Faeroe Islands and Norway • Not extensively tested or evaluated in other fisheries • Gear trials supported by Swedish Agency for Marine and Water Management (SWaM) and the Ministry. Swedish University of Agricultural Sciences www.slu.se
Gear trials The light and camera • Not possible to have a double set of trawls. • Camera used for observations/quantitative evaluation. • Experimental work in 2015 and 2016 on-board GG330 Carmona. Swedish University of Agricultural Sciences www.slu.se
A possible solution Schematic presentation Grid Light and camera Codend Front of trawl Net opening Swedish University of Agricultural Sciences www.slu.se
Setting up the Saithe grid Swedish University of Agricultural Sciences www.slu.se
Trials 2015 & 2016 • Cameras; finding the angle and position of cameras for good footage • Grid set-up; angle and position Objectives • Minimize saithe bycatch • Minimize loss of herring Swedish University of Agricultural Sciences www.slu.se
Results according to objectives Catch of Loss of Saithe Herring Herring Saithe Saith (t) Haul # Herring bycatch Catch (t) loss % catch (t) calculate (t) (%) d Film Film Film 2015 7 65 1.74 2.7 0.37 7.32 5.0 2015 12 70 3.68 5.3 0.24 3.71 6.5 2015 13 36 5.39 15.0 0.22 2.79 7.9 2015 14 40 2.96 7.4 0.20 2.55 7.8 2015 15 30 2.88 9.6 0.16 3.90 4.1 2016 3 5 NA NA 0 0,07 0 2016 4 10 0.9 0 9.3 0.1 1.6 2016 5 50 2.4 4.8 0.02 1.09 2.3 Swedish University of Agricultural Sciences 2106 8 1.66 16 NA 0 0.31 0.8 www.slu.se
Implications of a saithe grid • Grid reduces unwanted catch of saithe with 92-100% – With grid 30 kg/h saithe/h – Without grid, up to 1.5 ton saithe/h • Acceptable loss of herring – On average 7.7% • In 2015 two vessels, 2016 8 vessels and for 2017 the entire Swedish pelagic fleet is planning to use the grid • Excellent example of how the LO should be dealt with, within the CFP framework • Mitigate saithe as choke species • Reduces catch handling and improves fish quality • Likely to be used in other fisheries selecting small fish from large fish Swedish University of Agricultural Sciences www.slu.se
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