Identification

Title

2008 - 2008 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Irish Sea Fish Egg Production Survey 2008

Abstract

This survey series took place from 2006 to 2010 and consisted of 15 voyages. Plankton samples were collected at each site on a planned survey grid. This data consists of the numbers of fish eggs and larvae, along with associated positional data and volumes filtered. A fine mesh (80 micron) 'PUP' sampler, attached to the frame of the Gulf VII sampler, was used to collect plankton samples for analysis of zooplankton species. These were analysed under Cefas contract C3576 and are recorded separately.

Resource type

dataset

Resource locator

Unique resource identifier

code

CEFASf8792be1-a25d-4c15-82ac-85d7da579c3a

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

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

-7

East bounding longitude

-2.5

North bounding latitude

55

South bounding latitude

53

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

2008-01-28

End position

2008-04-22

Dataset reference date

date type

publication

effective date

2019-10-29

Frequency of update

notPlanned

Quality and validity

Lineage

The main aims for these cruises were to; - Conduct a plankton survey using a 76cm Gulf VII plankton sampler to determine the distribution and abundance of cod (- *Gadus Morhua*- )- ,- haddock (- *Melanogrammus aeglefinus*- ), and plaice (- *Pleuronectes platessa*- ) eggs. - Remove stage 1A and 1B gadoid-like eggs from fresh plankton samples at sea. To measure, stage and preserve these eggs in ethanol prior to species identification using a DNA technique on return to the laboratory (CEFAS). **CELTIC VOYAGER Cruise 05/2008:** A Gulf VII plankton sampler, fitted with a 40cm aperture nosecone and 270μm mesh net was used for the first four stations with an auxiliary 80μm mesh ‘Pup’ net attached. Fish eggs in early development stages and between 1.10 and 1.75mm diameter were removed and individually preserved in ethanol. A total of 991 eggs were obtained during this cruise. **CELTIC VOYAGER Cruise 07/2008:** A Gulf VII plankton sampler was fitted with a 35cm aperture nosecone and 270μm mesh net for the first 7 stations. As clogging of this net (with phytoplankton) was making egg sorting extremely difficult it was decided to change to a 425μm mesh net which was used for the remainder of the survey. An auxiliary 80μm mesh 'Pup' net was also attached to the sampler frame. Ninety-nine plankton stations were completed, covering the whole Irish Sea from 53º 00'N to 55º 00'N. Fish eggs in early stages of development and between 1.1 and 1.75mm diameter were removed and individually preserved in ethanol. A total of 834 eggs were obtained during this cruise. **CEFAS ENDEAVOUR Cruise 02/2008:** A Gulf VII plankton sampler, fitted with a 40cm aperture nosecone and 270μm mesh net was used during this survey, with an auxiliary 80μm mesh ‘Pup’ net attached. A Valeport CTD mounted on the sampler, provided ‘real time’ flow-meter data. 105 plankton stations were completed, covering the whole Irish Sea from 53º 00'N to 55º 00'N.The Valeport CTD system caused numerous problems throughout the survey. Fish eggs in early development stages and between 1.1 and 1.75mm diameter were removed and individually preserved in ethanol. A total of 572 eggs were obtained during this cruise. **CORYSTES Cruise 08/2008:** A total of 104 stations were sampled. Fish eggs in early development stages 1A and 1B and between 1.10 and 1.75mm diameter were removed and individually preserved in ethanol. A total of 1614 eggs were obtained during this cruise. **CORYSTES Cruise 15/2008:** A total of 104 stations were sampled. Fish eggs in early development stages 1A and 1B and between 1.10 and 1.75mm diameter were removed and individually preserved in ethanol. A total of 110 eggs were obtained during this cruise. An article has been published on this set of surveys, detailed as follows. Irish Sea: the effects of modelling choices and assumptions D.L. Maxwell*, M.J. Armstrong*, S. Beggs and J.N. Aldridge* (2011) Fisheries Research (Special Issue on Egg Production Methods for Estimating Fish Biomass) 117-118; 146-156

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

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

2019-10-29T10:09:44

Metadata language