Identification

Title

1981 - 1981 Centre for Environment, Fisheries & Aquaculture Science (Cefas) North Sea Plankton Survey - RV Cirolana 01/81

Abstract

Ichthyoplankton samples were collected over three separate periods during a survey in an area 15 miles south south west of Brown Ridge in the central North Sea. As part of a number of survey objectives the distribution of early stage plaice eggs was investigated. This data consists of the numbers of plaice eggs and the larvae of herring and sprat identified from the main net samples. Positional data and volumes filtered are included.

Resource type

dataset

Resource locator

Unique resource identifier

code

CEFAS58175dfc-bf1e-48ec-b830-7d0819e410ba

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

2.5

East bounding longitude

4

North bounding latitude

53

South bounding latitude

52.25

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

1981-01-06T00:00:00.000Z

End position

1981-01-16T00:00:00.000Z

Dataset reference date

date type

publication

effective date

2019-10-29

Frequency of update

notPlanned

Quality and validity

Lineage

Plankton sampling was carried out in an area 15 miles SSW of Brown Ridge using a Lowestoft 30" high speed plankton sampler and a Longhurst-Hardy Plankton Recorder. Analysis of ichthyoplankton samples was carried out using Cefas standard methods and identification guides. Fish eggs and larvae were picked out from all samples by eye and, whenever practicable, the whole sample was sorted. When sub-sampling was necessary this was done using a Folsom splitter. Data tables containing the raw analysis data have been extracted from Access database into comma separated variable 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