2019 - 2020 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Inshore longline fisheries in the Southern North Sea 2019/20 - Fisheries Science Partnership
FSP Report 63 Inshore Longline Survey 2019/2020
This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The overall aims of this project were to examine i) the seasonal catch rates of fish taken in the southern North Sea demersal longline fishery; ii) catch composition of all discarded and retained fish; iii) vitality of commercially important skate and ray species, focusing on thornback ray *Raja* *clavata* ; iv) post-release behaviour and discard survival of discarded thornback ray through an electronic tagging programme. On each occasion longlines were deployed, the positional information, soak times, and number of hooks/baths were recorded, and for all species of fish length distribution data were taken. For electronically tagged fish the release date, release position and individual length, wing width, sex and maturity were recorded.
dataset
http://data.cefas.co.uk/#/View/20925/
function: order
CEFAS95e3e817-f0c8-480e-8ca3-b8693b00ebc8
http://www.cefas.co.uk/
eng
OGP
urn:ogc:def:crs:EPSG::4326
biota
revision
2011-03-25
publication
2008-06-01
0.5
2
52.25
51.5
revision
2010-05-18
2019-08-01T22:00:00.000Z
2020-01-31T23:00:00.000Z
publication
2020-12-18
notPlanned
Three inshore longline surveys were successfully completed, each consisting of three days, and fishing at six locations, undertaken seasonally (August 2019, November 2019 and January 2020). In each location, a line comprising three sets of lines (“baths”) were deployed, with ca. 600 No 7 J-hooks in total. Whilst the number of “baths” deployed was less than the ‘normal’ commercial fishing activity (ca. 8 baths), it allowed for a higher number of locations to be chosen and covered per survey, and still allowed typical commercial fishing operations to be undertaken. All fish species brought onboard were recorded in terms of their total length (measured to the cm below), sex and maturity. For male skate and shark species encountered (with the exception of lesser-spotted dogfish), maturity was further discriminated as these species could be externally assessed. Additional wing width measurements (measured to the cm below), were also recorded for all skate species. Further data collection included whether the fish would refer to the retained or discarded component part of the catch. A random subsample of the retained and discarded thornback ray were further assessed in terms of health condition and vitality. A sub-sample of the thornback ray were tagged electronically with data storage tags (DST) to further infer on the post-release survival after capture by longline.
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
2020-12-18T06:22:33