Identification

Title

2001-2014 Eastern Inshore Fisheries and Conservation Authority (Eastern IFCA) River Stour and Orwell cockle surveys

Abstract

Eastern IFCA (and its predeccesor, ESFJC) have conducted stock assessment surveys of cockle (Cerastoderma edule) every two years from 2001-2009 (excluding 2005), and then annually since 2009 along both the River Stour and River Orwell, Suffolk. The aim of the surveys has been to undertake a stock assessment of the cockles to identify any potential commerical stocks.

Resource type

dataset

Resource locator

http://www.eastern-ifca.gov.uk/

description: A link to the general host site

Unique resource identifier

code

EIFCASuffolkCockles

codeSpace

Dataset language

eng

Spatial reference system

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

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2008-01-06

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

creation

effective date

2011-02-16

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

creation

effective date

2003-01-01

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2009-11-16

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2011-09-01

Geographic location

West bounding longitude

1.1852

East bounding longitude

1.2283

North bounding latitude

51.9557

South bounding latitude

51.9440

Extent

Extent group

authority code

title

reference date

date type

creation

effective date

2009-06-18

code identifying the extent

Southern North Sea

Extent group

authority code

title

reference date

date type

creation

effective date

2009-05-01

code identifying the extent

38E0

Extent group

authority code

title

reference date

date type

creation

effective date

1954-01-01

code identifying the extent

North Sea

Extent group

authority code

title

reference date

date type

revision

effective date

2010-01-01

code identifying the extent

infralittoral

Extent group

authority code

title

reference date

date type

creation

effective date

2014-05-16

code identifying the extent

IVc

Temporal reference

Temporal extent

Begin position

2015-04-07

End position

2015-04-07

Dataset reference date

date type

publication

effective date

2015-04-07

date type

creation

effective date

2015-04-07

date type

revision

effective date

2015-04-07

Frequency of update

unknown

Quality and validity

Lineage

Samples were collected at regular intervals on a predetermined grid deployed from Kent and Essex IFCA vessel, RV Tamesis over high water. Forty-four stations are surveyed along the northern bank of the River Orwell between the Orwell Bridge and Levington Creek. Seventy-four stations were surveyed in the Holbrook bay area of the River Stour. Sample stations were spaced approx. 250m apart on the grid. Up to three samples were collected from each station using a 0.1m sq day grab, then the samples were washed over 3 millimetre (mm) washing table and any cockles found are placed in labelled bags. A qualitative description of the sediment type at each station is noted. Samples of cockles are measured to the nearest mm by length and width, are separated into size classes of less than 14mm, 14 mm, 15 mm, and greater than 16 mm width, and then separated into age classes. The cockles in each group were weighted to the nearest 0.01 gram. Cockle distribution and density maps were created in MapInfo GIS. The biomass of the cockles in each river was calculated by multiplying the mean weight of the samples by the area covered. The biomass of fishable stock was determined by the mean weight of the sample having reached a width of greater than 14 mm.

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Data is freely available for research or commercial use providing that the originators are acknowledged in any publications produced. Charts are not to be used for navigation.

Constraint set

Limitations on public access

There are no access restrictions.

Responsible organisations

Responsible party

contact position

MEO Data Lead

organisation name

Eastern Inshore Fisheries and Conservation Authority

email address

mail@eastern-ifca.gov.uk

responsible party role

originator

Responsible party

contact position

MEO Data Lead

organisation name

Eastern Inshore Fisheries and Conservation Authority

email address

mail@eastern-ifca.gov.uk

responsible party role

custodian

Metadata on metadata

Metadata point of contact

contact position

MEO Data Lead

organisation name

Eastern Inshore Fisheries and Conservation Authority

email address

mail@eastern-ifca.gov.uk

responsible party role

pointOfContact

Metadata date

2016-11-15

Metadata language