Gear trials in Skagerrak A new pelagic grid SLU Aqua Andreas - - PowerPoint PPT Presentation

Swedish University of Agricultural Sciences www.slu.se

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

• 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.

The light and camera

Swedish University of Agricultural Sciences www.slu.se

A possible solution

Schematic presentation

Codend Grid Net opening Front of trawl Light and camera

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

Haul # Herring Catch (t) Loss of Herring (t) Herring loss % Saithe catch (t) Catch of Saith (t) calculate d Saithe bycatch (%) 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 0,07 2016 4 10 0.9 9.3 0.1 1.6 2016 5 50 2.4 4.8 0.02 1.09 2.3 2106 8 1.66 16 NA 0.31 0.8

Results according to

• bjectives

Swedish University of Agricultural Sciences 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