Identification

Title

Selectivity of hake gill nets in the Southwest fishery 2005/06 - Fisheries Science Partnership

Alternative title(s)

FSP Selectivity of hake gill nets in the Southwest fishery

Abstract

To examine the catch composition and selectivity of a range of static gears for hake in the southwest fisheries. FSP Programme 8 demonstrated the selectivity characteristics of 120mm mesh gill nets used by UK hake fishermen off the south west coast of England. The experiment was carried out by comparing the catches in nets of mesh size 80, 100, 120 and 140mm deployed simultaneously at two fishing grounds. Additional 120mm nets were shot to obtain further data on size composition of hake. The work was carried out in October and November 2005, using the vessel *Carol H.*

Resource type

dataset

Resource locator

https://data.cefas.co.uk/view/625

name: Cefas Data Portal

description: The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: Binary download.

function: download

Unique resource identifier

code

CEFAS625

codeSpace

https://data.cefas.co.uk

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

biota

Keywords

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

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2010-05-18

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2012-01-11

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2012-01-11

Geographic location

West bounding longitude

-8.00

East bounding longitude

-3.00

North bounding latitude

52.00

South bounding latitude

49.50

Temporal reference

Temporal extent

Begin position

2005-10-08

End position

2005-11-14

Dataset reference date

date type

publication

effective date

2014-12-05

date type

revision

effective date

2023-11-21

date type

creation

effective date

2012-10-24

Frequency of update

notPlanned

Quality and validity

Lineage

The project objectives were addressed primarily through analysis of length frequency data. The length frequencies reflect a combination of the selectivity characteristics of the gear and the abundance of fish of different sizes present at the times and locations where the gear is fished. The selectivity of the gear can be represented by a curve showing the probability of fish of different sizes being caught when they try to escape the gear. In the case of a gill net where the majority of fish become gilled or wedged in the meshes, the curve is often bell shaped, with the peak corresponding to the sizes of fish most likely to be enmeshed. If additional fish are caught by entanglement (e.g. by teeth in the case of hake), the selection curve may cover a broader range of lengths or even have more than one length mode. When estimating the shape of the hake gill net selectivity curves, the variations in abundance of fish of different sizes around the net have to be considered. For enmeshing gears such as gill nets, the normal approach is to hang fleets of nets of different mesh but otherwise identical construction, and to compare the length frequencies in each. This approach was adopted for this FSP project.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2013-12-10

degree

false

explanation

See the referenced specification

Conformity report

specification

title

reference date

date type

publication

effective date

2010-12-08

degree

true

explanation

See the referenced specification

Data format

name of format

Unknown

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

Responsible organisations

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

originator

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

custodian

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

distributor

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

email address

data.manager@cefas.co.uk

responsible party role

owner

Responsible party

organisation name

Department for Environment, Food and Rural Affairs (DEFRA)

email address

defra.helpline@defra.gov.uk

responsible party role

owner

Metadata on metadata

Metadata point of contact

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

pointOfContact

Metadata date

2023-11-21T12:40:11

Metadata language