Identification

Title

2006 - 2008 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Irish Sea Fish Egg Production Survey - Zooplankton Data

Alternative title(s)

Irish Sea Demersal Fish Recruitment Processes

Abstract

A series of cruises carried out in the Irish Sea from 2006 to 2008 by the Centre for Environment, Fisheries and Aquaculture Science. This data consists of the analysis results of the fine mesh (PUP) net samples and consist of numbers of zooplankton identified, along with associated positional data and volumes filtered.

Resource type

dataset

Resource locator

Unique resource identifier

code

CEFAS3b5ea0bb-3a72-4b8e-b30b-42f3c66f5a41

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

55.25

South bounding latitude

51.75

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

2006-02-21

End position

2008-04-03

Dataset reference date

date type

publication

effective date

2019-10-29

Frequency of update

notPlanned

Quality and validity

Lineage

Analysis of the main net samples (ichthyoplankton and macroplankton) was carried out under Cefas contract MH003, and these results are recorded separately. Gear used: Gulf VII High Speed Plankton Sampler equipped with a 35cm/40cm aperture nose cone and 70μm/425μm mesh with 280μm mesh cod ends. A PUP sampler fitted with a General Oceanics standard speed mechanical flowmeter and fine mesh, an auxiliary 80μm mesh 'pup' net attached to a sampler frame, fine 80μm mesh 'pup' sampler with ESM2 logger. Valeport CTD and software, Seabird 911 CTD, AFBINI (Agri-Food and Biosciences Institute Northern Ireland) Pronet CTD and software system, SCANMAR depth sensor. Sampler deployment: The sampler was deployed in a double oblique tow from the surface to within 2 m of the seabed. Veering and hauling speeds were manually adjusted to ensure that each depth band was sampled equally. At shallow stations, multiple double oblique dives were necessary to enable a sufficient volume of water to be filtered. A minimum sampler deployment time of 15 minutes was aimed for. On recovery, the net was carefully washed down and the sample collected from the end bag. Each sample was then fixed using buffered formaldehyde solution and transported to the participating laboratories for sorting and identification. Sample analysis: Zooplankton were identified and enumerated from a sub-sample using microscopy. Identification was carried out by experienced taxonomists with reference to relevant identification guides and keys. Data storage: The raw data were stored on an Access database. The various data files were stored on the database in a series of tables linked by having the content of certain fields in common. All routine calculations, calibration changes and conversions were carried out on the database. The data tables (but not queries) have now been extracted into text files. Plankton data are normally expressed as either number of organisms per m3 or per m2. These are calculated from the volume of water filtered (derived using regression co-efficients calculated for different flowmeters). Number per m3 is obtained by dividing the numbers per sample by the volume filtered, and number per m2 of sea surface is obtained by multiplying the number per m3 by the mean total or sampled depth during a deployment.

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