2019 - 2019 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/20 - Fisheries Science Partnership
FSP Report 65 Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/2020
This work was carried out as part of the Fisheries Science Partnership (FSP) programme. 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. The specific objective was to modify the escape area in the Net Grid to retain selected commercial species and minimise catches of unwanted fish. This was achieved by conducting field trials of a modified Net Grid trawl with two cod ends – a lower cod end to retain primarily the *Nephrops* and an upper cod end to retain and select for commercial fish. At each station sampled, shot and haul, positional and times information were recorded, and for all species of fish length distribution data were taken.
dataset
http://data.cefas.co.uk/#/View/20927/
function: order
CEFAS2bc2aa29-1249-487c-a719-b730a2662996
http://www.cefas.co.uk/
eng
OGP
urn:ogc:def:crs:EPSG::4326
biota
revision
2011-03-25
publication
2008-06-01
-2
0
55.25
54.5
revision
2010-05-18
2019-10-01T22:00:00.000Z
2019-10-31T00:00:00.000Z
publication
2020-12-18
notPlanned
The trawler LUC SN36 was chartered to undertake trials in a *Nephrops* ( *Nephrops norvegicus* ) fishery. Twelve days of fishing trials were conducted in the Farne Deeps (ICES Rectangles: IVb; 38E8 and 39E8) fishing grounds off the North-East coast of England in October 2019. This enabled catch comparisons of three upper cod ends of varying mesh size and twine thickness to be examined in a single rig trawl with a selective Net Grid modification. Different upper cod ends were tested to select for the fish that were separated from *Nephrops* by the Net Grid, while the lower cod end was unchanged. A total of 28 hauls were completed, with 27 valid for analyses. Catches from the two cod ends were always kept separate. The lower cod-end was then delivered into the empty hopper and processed. 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.
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
originator
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
custodian
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
pointOfContact
2020-12-18T06:22:29