Identification

Title

2003 - 2003 Centre for Environment, Fisheries & Aquaculture Science (Cefas) North Sea pout bycatch mitigation 2003/04 - Fisheries Science Partnership

Alternative title(s)

FSP North Sea pout bycatch mitigation

Abstract

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.

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/2908/

function: order

Unique resource identifier

code

CEFAS5a410d4a-3d06-450b-93c9-b05404f3029d

codeSpace

http://www.cefas.co.uk/

Dataset language

eng

Spatial reference system

authority code

OGP

code identifying the spatial reference system

urn:ogc:def:crs:EPSG::4326

Classification of spatial data and services

Topic category

biota

Keywords

Keyword set

keyword value

Keyword set

keyword value

originating controlled vocabulary

title

SeaDataNet P021 parameter discovery vocabulary

reference date

date type

revision

effective date

2011-03-25

Keyword set

keyword value

originating controlled vocabulary

title

GEMET - INSPIRE themes, version 1.0

reference date

date type

publication

effective date

2008-06-01

Geographic location

West bounding longitude

-4.5

East bounding longitude

2

North bounding latitude

60.75

South bounding latitude

56

Extent

Extent group

authority code

title

SeaVoX Vertical Co-ordinate Coverages

reference date

date type

revision

effective date

2010-05-18

code identifying the extent

Temporal reference

Temporal extent

Begin position

2003-12-01T00:00:00.000Z

End position

2003-12-31T00:00:00.000Z

Dataset reference date

date type

publication

effective date

2017-02-14

Frequency of update

notPlanned

Quality and validity

Lineage

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. .

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply

Constraint set

Limitations on public access

Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply

Responsible organisations

Responsible party

contact position

Data Manager

organisation name

Centre for Environment, Fisheries & Aquaculture Science

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

telephone number

+44 (0)1502 562244

email address

data.manager@cefas.co.uk

responsible party role

originator

Responsible party

contact position

Data Manager

organisation name

Centre for Environment, Fisheries & Aquaculture Science

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

telephone number

+44 (0)1502 562244

email address

data.manager@cefas.co.uk

responsible party role

custodian

Metadata on metadata

Metadata point of contact

contact position

Data Manager

organisation name

Centre for Environment, Fisheries & Aquaculture Science

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

telephone number

+44 (0)1502 562244

email address

data.manager@cefas.co.uk

responsible party role

pointOfContact

Metadata date

2017-02-14T10:27:36

Metadata language

eng