2003 - 2003 Centre for Environment, Fisheries & Aquaculture Science (Cefas) North Sea pout bycatch mitigation 2003/04 - Fisheries Science Partnership
FSP North Sea pout bycatch mitigation
Fisheries Science Partnership Programme 9, carried out in December 2003. The Programme was set up to investigate the extent to which a sieve net, incorporated into an industrial fishing trawl, could reduce the by-catch of whitefish whilst retaining sufficient catches of the target species Norway pout ( *Trisopterus esmarkii* ) in the northern North Sea. Sieve nets (also known as veil nets) are curved cone-shaped funnels of netting traditionally fitted to the inside of beam trawls used for brown shrimps, to reduce the by-catch of unwanted fish.
dataset
http://data.cefas.co.uk/#/View/2908/
function: order
CEFAS5a410d4a-3d06-450b-93c9-b05404f3029d
http://www.cefas.co.uk/
eng
OGP
urn:ogc:def:crs:EPSG::4326
biota
revision
2011-03-25
publication
2008-06-01
-4.5
2
60.75
56
revision
2010-05-18
2003-12-01T00:00:00.000Z
2003-12-31T00:00:00.000Z
publication
2017-02-14
notPlanned
The fishing grounds chosen for this project were in the northern North Sea, in and around the ‘Pout box’, on the known commercial fishing grounds for Norway pout. The trials were conducted throughout a continuous two-week period in December 2004, traditionally a peak period for landings from this fishery. The commercial fishing vessel chartered for this project was the 45-metre stern ramp freezer trawler FV Swanella, H 1065. Two types of small meshed demersal trawls were used during the trials: a) Industrial trawl. A commercial design used for industrial fishing, supplied by a Danish trawl maker was initially used during the trials. This trawl was limited to use on soft fishing grounds due to its light construction and ground-gear. b) Modified whitefish trawl. A whitefish trawl was fitted with a 20mm cod end liner. This trawl was of a more substantial construction than the industrial trawl, with heavier ground gear, and could therefore be deployed over a wider terrain than the industrial trawl. The sieve net was constructed from 70mm (full mesh) diamond mesh polyethylene material (1.5mm diameter). Various minor adjustments were made to the sieve net throughout the course of the trials in an attempt to improve its performance. Both the industrial trawl and the whitefish trawl with the 20mm liner were repeatedly tested both with and without the sieve net in paired alternate hauls. In total, 37 hauls were made during the course of the trials, six of which were invalid due to fouled or damaged gear. The haul durations varied between 110 - 200 minutes (average 142 min) in depths ranging from 120 – 240 metres (average 154 m). The average towing speed was 3.9 knots (over the ground) and the choice of haul direction was made regardless of tidal flow. Fishing was conducted across, with and against the tide. Paired hauls were used to compare the catches in the trawl with and without a sieve net fitted. In each comparison the two tows with the different net configurations were made one after the other, over the same ground track and for the same duration as far as was practicable. .
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
originator
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
custodian
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
pointOfContact
2017-02-14T10:27:36