Identification

Title

Net Grid Trials in the Farne Deeps Nephrops Trawl Fishery 2020-2021 - Fisheries Science Partnership

Alternative title(s)

Report 69 Net Grid Trials in the Farne Deeps Nephrops Trawl Fishery 2020-21

Abstract

Catch data (quantities and sizes by species) from trials of a selective Net Grid trawl. This work was carried out as part of the Fisheries Science Partnership (FSP) programme and continues previous studies conducted during 2019/20 (`https://data.cefas.co.uk/view/20927`_). The aim of this project was to further develop a selective Net Grid trawl with two cod ends to improve performance and enable skippers to better match their catch compositions to their quota allocations. The information from the trials will help skippers adapt to the Landing Obligation by avoiding unwanted fish in a fishery identified as having relatively high discard rates and will demonstrate to managers the level of selectivity improvement that is currently achievable to help formulate Discard Plans. This trial sought to collect catch data on an upper cod end construction designed to retain commercially sized fish and test the effect on the level of separation of fish between the upper and lower cod ends when using different mesh sizes (100mm vs 200mm) in the incline separation panel. Also examined was the effect of using artificial lights around inclined panel to assess the effect on the level of separation. At each station sampled, shot and haul, positional and times information were recorded, and for all species of fish length distribution data were taken. .. _`https://data.cefas.co.uk/view/20927`: https://data.cefas.co.uk/view/20927

Resource type

dataset

Resource locator

https://data.cefas.co.uk/view/21407

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

CEFAS21407

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

2012-01-11

Geographic location

West bounding longitude

-2.00

East bounding longitude

0.00

North bounding latitude

55.25

South bounding latitude

54.50

Temporal reference

Temporal extent

Begin position

2020-11-15

End position

2020-12-03

Dataset reference date

date type

notPlanned

Quality and validity

Lineage

The trawler *LUC SN36 *was chartered to undertake trials in a *Nephrops * (*Nephrops norvegicus*) fishery on the selective Net Grid trawl. Sixteen days of fishing trials were conducted in the Farne Deeps (FU6: IVb; 38E8 and 39E8) fishing grounds off the North-East coast of England in November and December 2020. A total of 32 hauls were completed, with 30 valid for analyses. A fixed routine for handling and sorting the catch was maintained throughout the trials. Catches from the two cod ends were always kept separate. The net was drawn up to the vessel’s stern and the upper cod end emptied into boxes for processing. The lower cod-end was then delivered into the vessel’s hopper for processing. The crew sorted the catch as they would normally; with the exception that all material usually discarded was retained in baskets for sampling as the “discard fraction”. Processed wanted catch and unwanted catch from each cod end were kept separate till all quantities and details had been recorded. Cefas observers sampled using standard techniques. For each haul, all fish species caught were measured to the nearest cm below. Sub sampling was necessary on occasions when the fish catch was large, but sub samples reflected the total catch composition and raising factors were calculated.

Conformity

Conformity report

specification

title

INSPIRE Data Specification on Species Distribution – Technical Guidelines

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

responsible party role

distributor

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

email address

data.manager@cefas.co.uk

responsible party role

pointOfContact

Metadata date

2022-08-15T05:59:54

Metadata language

eng