Identification

Title

2003 - 2003 Centre for Environment, Fisheries & Aquaculture Science (Cefas) English Channel and Southern North Sea Plankton Survey - RV Corystes 4z/2003

Abstract

Two plankton surveys were carried out (RV Cirolana 2x/02: 29th April-12th May 2002 and **RV Corystes 4z/03: 4th-9th May 2003**) in the English Channel and southern North Sea to determine the distribution and abundance of crab (*Cancer pagurus*) larvae in relation to fishing ground and sea bed sediments over the sea area bounded by latitudes 48° 30'N and 53° 00'N and longitudes 9° 00'W and 2° 00'W. This data consists of the numbers and developmental stages of crab larvae, along with associated positional data and volumes filtered.

Resource type

dataset

Resource locator

Unique resource identifier

code

CEFAS5480f0a5-07ba-4551-844d-2afe9cbe6931

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

-8

East bounding longitude

3

North bounding latitude

52.5

South bounding latitude

48

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

2003-05-04

End position

2003-05-19

Dataset reference date

date type

publication

effective date

2019-10-29

Frequency of update

notPlanned

Quality and validity

Lineage

Samples were collecting using a 53 cm high speed towed net (‘tin tow’), fitted with 20 cm aperture nose cone, 270μm mesh end bag and the Guildline Conductivity Temperature Depth (CTD) monitoring system. 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 laboratory for sorting and identification.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 etc) have now been extracted into text files. Plankton data are normally expressed as either number of organisms per m3 or per m2. The number per m3 is obtained by dividing the numbers per sample by the volume filtered, calculated from the sampler flowmeters. Number per m2 is obtained by multiplying the number per m3 by the mean 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