Identification

Title

2013 - 2013 Centre for Environment, Fisheries & Aquaculture Science (Cefas) North East Coast Net Grid Trials 2013/14 - Fisheries Science Partnership

Alternative title(s)

FSP North East Coast Net Grid Trials

Abstract

The twin rig trawler Aquarius II was chartered for ten days in September and October 2013 to undertake fishing trials in the Nephrops ( *Nephrops norvegicus* ) fishery off the North east coast of England. The aim of the work was to significantly reduce cod catches in this fishery through collective action with local fishing skippers. The practical approach taken was to insert a design concept under development known as the Net Grid into a trawl and to evidence changes in selectivity towards cod and other commercial species under normal fishing conditions. The objective of the work was to further develop this design with the aim of developing a trawl that reduces catches of cod in the English NE Nephrops trawl fishery without losing the target species of *Nephrops* .

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/3592/

function: order

Unique resource identifier

code

CEFAS102594ff-0257-47dd-b4d7-1ad5f5d319b0

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, version 1.0

reference date

date type

publication

effective date

2008-06-01

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

-2

East bounding longitude

-0.5

North bounding latitude

55.25

South bounding latitude

54.5

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

2013-09-23

End position

2013-10-18

Dataset reference date

date type

publication

effective date

2017-02-01

Frequency of update

notPlanned

Quality and validity

Lineage

The vessel’s own commercial trawls were used for the trial. With the exception of the experimental modification, both trawls were of identical construction; the trawls had a 400 mesh x 80 mm fishing circle, with ground gear of 37m constructed from 15cm and 22cm rubber discs. The starboard trawl was altered by including the Net Grid modification which had a 200mm square mesh panel; the other was left in its standard commercial configuration with a 90mm square mesh panel to provide a direct comparison. The trawls complied with existing technical regulations and for the purpose of these trials were fitted with new, identical 85 mm cod ends. The trawls were towed simultaneously as a twin rig, using a 3-warp towing system with a 450 kg clump centre weight and spread using ThyborØn® 55 doors. Two versions of the Net Grid were tested. The "long" version (Version 1) was operated for 14 tows and the "short" version (Version 2) for 10. Tows of 3-5 hours duration, i.e. typical of normal commercial practice, were conducted in the Farne Deeps fishing grounds off the North East coast of England. Towing speed was on average between 2.0 and 2.7 knots. The area of the main Nephrops fishing grounds within the Farne Deeps is classed as Functional Unit 6 (FU6) in the North Sea Nephrops stock assessment and is very small and highly localised. All fishing took place in the statistical rectangles 38E9 and 39E9 in ICES area IVb, bottom depths ranged between 55 and 101 m. Fishing took place during daylight and darkness, however because Nephrops catches were negligible during darkness, priority was placed on achieving daylight tows. Version 1 of the Net Grid was operated from 23rd till the 26th of September and resumed on the 8th of October after a spell of South-easterly gales, till a period of Northerly gales interrupted trials after the 9th. Version 2 was operated in one continuous period between the 15th and 18th of October.

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

2017-02-01T13:33:35

Metadata language

eng