Identification

Title

2013 - 2013 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Area VII Haddock Discard Eliminations using Technical Measures 2013/14 - Fisheries Science Partnership

Alternative title(s)

FSP Area VII Haddock Discard Eliminations using Technical Measures

Abstract

The twin rig trawler Ocean Spirit was chartered for twelve days in August and September 2013 to undertake fishing trials off southwest England. The aim of the work was to improve the selective performance of demersal otter trawls to reduce unwanted catches of haddock in ICES area VII. The practical approach taken was to insert large diamond‐mesh escape panels into the top forward sections of the trawl and to evidence changes in selectivity towards haddock and other commercial species under normal fishing conditions. The vessel’s own commercial twin‐rig trawl was used for the trials; one rig was modified by including large diamond‐mesh panel(s), the other was left in its standard commercial configuration to provide a direct comparison.

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/3593/

function: order

Unique resource identifier

code

CEFASa6846576-eb68-42d8-819a-1bd3eb460453

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

reference date

date type

revision

effective date

2011-03-25

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Geographic location

West bounding longitude

-7

East bounding longitude

-1

North bounding latitude

51

South bounding latitude

47.5

Extent

Extent group

authority code

title

reference date

date type

revision

effective date

2010-05-18

code identifying the extent

Temporal reference

Temporal extent

Begin position

2013-08-13T00:00:00.000Z

End position

2013-09-04T23:00:00.000Z

Dataset reference date

date type

publication

effective date

2018-01-19

Frequency of update

notPlanned

Quality and validity

Lineage

The vessel’s own commercial trawls were used for the trial; one trawl was modified by including large diamond‐mesh panels, the other was left in its standard commercial configuration to provide a direct comparison. With the exception of the experimental modification, both trawls were of identical construction; the design had a 350 meshes x 115 mm fishing circle, with 160 mm meshes in the upper wings and ground gear that consisted of 6 inch and 8 inch rubber discs. The trawls were towed simultaneously as a twin rig using a 3‐warp towing system with a 400 kg clump centre weight and spread using ThyborØn 72 inch doors. The trawls complied with existing technical regulations and, for the purpose of these trials, were fitted with new, identical 100 mm codends. To reduce any port/starboard bias, the test trawls were fished on both sides during the trials; they were changed over to ensure that there were approximately equal numbers of tows on each side for each test gear. This has been common practice for gear trials of this type, although observations made on a catch sampling trip carried out prior to any gear modification indicated that this measure may have been unnecessary. Tows were conducted on fishing grounds commonly used by commercial vessels and characterised by haddock abundance; all fishing took place in the statistical rectangles identified in the project proposal (28E3 and 28E4) in ICES area VIIe, and bottom depths ranged between 71 and 106m. The trials took place in VIIe, however, it is considered that the results can be extrapolated to compatible fishing grounds in the Celtic Sea (VIIfgh).

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

2018-01-19T15:05:34

Metadata language