Identification

Title

2001 - 2001 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Triennial Mackerel Egg Surveys at the Shelf Edge - RV Corystes 01/2001

Abstract

Abundance of ichthyoplankton in samples from dedicated plankton surveys by Cefas with positional and sample data. Surveys took place off the Western Coast of the UK and Ireland between 1986 and 2004.

Resource type

dataset

Resource locator

http://data.cefas.co.uk/#/View/3797/

function: order

Unique resource identifier

code

CEFASb94d4ec2-3fde-4129-8868-9f12f9fac69e

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

-13

East bounding longitude

-1

North bounding latitude

59.5

South bounding latitude

43

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

2001-02-04

End position

2001-02-17

Dataset reference date

date type

publication

effective date

2020-01-31

Frequency of update

notPlanned

Quality and validity

Lineage

Series of cruises undertaken to contribute to the estimation of the spawning stock biomass of the western mackerel and horse mackerel stocks by plankton survey. The tri-ennial mackerel egg surveys were begun in 1977 to estimate the SSB of the western mackerel stock. Since 1986 the surveys have also been used to estimate the SSB of horse mackerel. Plankton sampling is undertaken to estimate the egg production and trawling is carried out to estimate the mean fecundity of the mature female fish. Various designs of Gulf VII type samplers have been used with various apertures of nosecones and 270 micron nets. Samplers are now standardised to the 53cm version, fitted with 20cm aperture nosecones. Analysis at Cefas involved separating all fish eggs and larvae from samples. Where possibe all eggs were identified. Eggs lacking identifiable features were measured. Where >100 eggs were found, sub-sampling was undertaken. Eggs which were unmeasured were apportioned across the size distribution of measured eggs. All mackerel and horse mackerel eggs were staged. **Associated Datasets: ** WG MEGS (ICES Working Group on Mackerel eggs) egg measurement data. Corystes 01 2001 - A Gulf III type plankton sampler, fitted with a 20cm aperture nosecone and 270μm micron mesh net was used during this survey. Sixty plankton stations were completed, 46 of which were in the ‘Southern’ area. Catches of plankton were light, particularly over deep water off the continental shelf. On only one station (Stn 24, Figure 1) were large numbers of fish eggs evident and a preliminary examination indicated that most of these were not mackerel or horse mackerel.

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

2020-01-31T09:15:39

Metadata language