Identification

Title

2019 - 2020 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Inshore longline fisheries in the Southern North Sea 2019/20 - Fisheries Science Partnership

Alternative title(s)

FSP Report 63 Inshore Longline Survey 2019/2020

Abstract

This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The overall aims of this project were to examine i) the seasonal catch rates of fish taken in the southern North Sea demersal longline fishery; ii) catch composition of all discarded and retained fish; iii) vitality of commercially important skate and ray species, focusing on thornback ray *Raja* *clavata* ; iv) post-release behaviour and discard survival of discarded thornback ray through an electronic tagging programme. On each occasion longlines were deployed, the positional information, soak times, and number of hooks/baths were recorded, and for all species of fish length distribution data were taken. For electronically tagged fish the release date, release position and individual length, wing width, sex and maturity were recorded.

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/20925/

function: order

Unique resource identifier

code

CEFAS95e3e817-f0c8-480e-8ca3-b8693b00ebc8

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

0.5

East bounding longitude

2

North bounding latitude

52.25

South bounding latitude

51.5

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

2019-08-01T22:00:00.000Z

End position

2020-01-31T23:00:00.000Z

Dataset reference date

date type

publication

effective date

2020-12-18

Frequency of update

notPlanned

Quality and validity

Lineage

Three inshore longline surveys were successfully completed, each consisting of three days, and fishing at six locations, undertaken seasonally (August 2019, November 2019 and January 2020). In each location, a line comprising three sets of lines (“baths”) were deployed, with ca. 600 No 7 J-hooks in total. Whilst the number of “baths” deployed was less than the ‘normal’ commercial fishing activity (ca. 8 baths), it allowed for a higher number of locations to be chosen and covered per survey, and still allowed typical commercial fishing operations to be undertaken. All fish species brought onboard were recorded in terms of their total length (measured to the cm below), sex and maturity. For male skate and shark species encountered (with the exception of lesser-spotted dogfish), maturity was further discriminated as these species could be externally assessed. Additional wing width measurements (measured to the cm below), were also recorded for all skate species. Further data collection included whether the fish would refer to the retained or discarded component part of the catch. A random subsample of the retained and discarded thornback ray were further assessed in terms of health condition and vitality. A sub-sample of the thornback ray were tagged electronically with data storage tags (DST) to further infer on the post-release survival after capture by longline.

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

2020-12-18T06:22:33

Metadata language