Identification

Title

2012 - 2013 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Monitoring Thornback Ray Movements & Assessing Stock Levels 2012/13 - Fisheries Science Partnership

Alternative title(s)

FSP Monitoring Thornback Ray Movements & Assessing Stock Levels

Abstract

The primary aim of this Fisheries Science Partnership project was to monitor spatial movements of thornback ray ( *Raja clavata* ) from three inshore regions along the coast of East Anglia, with the prospect of understanding stock structure in ICES Division IVc better. Additional data were collected on catch rates, size and sex composition, maturity stage, health condition and clasper length (males). Three study sites were chosen and surveyed: ( 1.)Lincolnshire to Northwest Norfolk (Skegness to Wells) ( 2.)Northeast Norfolk (Blakeney to Great Yarmouth) ( 3.)South Suffolk (Felixstowe to Lowestoft).

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/3589/

function: order

Unique resource identifier

code

CEFAScba240da-b900-475e-8278-209b1d7edd96

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

-0.5

East bounding longitude

8

North bounding latitude

54

South bounding latitude

50.5

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

2012-12-01

End position

2013-07-31T23:00:00.000Z

Dataset reference date

date type

publication

effective date

2018-01-19

Frequency of update

notPlanned

Quality and validity

Lineage

Two < 10m commercial fishing vessels were used to cover three survey areas over a total of 15 days. Longlines were used by both vessels as the preferred gear type, allowing the fish to be brought on board the vessel in best condition. Once the fish were on board, the total length and wing width (cm), sex and qualitative health state (lively, sluggish, near dead or dead) were recorded. The maturity stage of males was also recorded by visual inspection and, where time allowed, the length (mm) of the claspers was recorded. Maturity staging of females requires examination of the internal gonads, so this was only done for females that were dead on hauling. Maturity stage can be recorded for some of the females at stage D (active), as indicated by egg cases extruding from the cloaca. Thornback rays were tagged with either a Petersen disc or a Rototag, each with a unique identifying number and Cefas contact information for recaptures. During the surveys, some additional species of elasmobranch were also tagged opportunistically, including blonde ray, spotted ray, starry smooth hound *Mustelus asterias* and tope *Galeorhinus galeus* .

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

2018-01-19T15:08:09

Metadata language