Identification

Title

2006 - 2006 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Gillnet retrieval survey 2006/07 - Fisheries Science Partnership

Alternative title(s)

FSP Gill net retrieval survey

Abstract

Gillnet retrieval survey carried out on fishing grounds to the south-west of Ireland, from 4th to 24th July 2006, using the commercial trawler FV Regina Ponti, to examine the quantity and mesh size of lost and discarded gillnets in the anglerfish and shark fisheries in two areas of Porcupine Bank.

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/2916/

function: order

Unique resource identifier

code

CEFAS29a4f7ba-bf73-4fc0-a46d-fff918085a4b

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

Geographic location

West bounding longitude

-17

East bounding longitude

-5

North bounding latitude

58.25

South bounding latitude

46.5

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

2006-07-04T00:00:00.000Z

End position

2006-07-24T00:00:00.000Z

Dataset reference date

date type

publication

effective date

2017-02-14

Frequency of update

notPlanned

Quality and validity

Lineage

A Fisheries Science Partnership survey was carried out in July 2006 to examine the quantity and mesh size of lost and discarded gillnets in the anglerfish and shark fisheries in two areas of Porcupine Bank. Information from the DEEPNET project suggests that lost and discarded gillnets from these fisheries to the west of the British Isles may continue to 'ghost fish' for long periods due to a slow rate of bio-fouling. The FV Regina Ponti was chartered to carry out a gillnet retrieval survey using a single grapnel. The survey area was chosen based on information on the distribution of fishing activity from VMS data. Retrieval tows along transects were stratified by depth, the two strata corresponding to the depth range of the anglerfish (400–800 m) and the deep-water shark (800–1200 m) fisheries. Mesh size was used to further attribute retrieved gear to fishery. The size and composition of any ghost catches taken by retrieved nets were recorded. Weather conditions throughout the trip were generally good. The targeted transects to the west of the Porcupine Bank were fully completed and those to the SW of Porcupine Bank were 91% completed. No complete fleets of gillnets were retrieved. Only parts of gillnets were retrieved and these comprised small portions of net a few square metres in area, headlines with some mesh, lead-lines with some mesh or occasionally both headline and lead-line with a portion of mesh. The majority of the mesh was either not present or was rarely recovered. Most recovered nets had a mesh size of between 270 and 290 mm, suggesting they were from the anglerfish fishery. Compared with the results of the 2005 FSP retrieval survey at Rosemary Bank, there was evidence of much greater quantities of gillnets at Porcupine Bank. This suggests that the distribution of lost and discarded gillnets may be very variable, even between areas where the level of gillnet activity is Ghost catches were found in 5 of the 12 gillnet fragments retrieved, most of which comprised only small numbers of various species of deep-water crab. Only one fragment had a significant ghost catch (0.3 tonnes) and this comprised deep-water crab (Geryon tridens). Only a single fish was observed in ghost catches throughout the survey.

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

2017-02-14T10:26:56

Metadata language