scholarly journals THE ACCUMULATION OF RADIONUCLIDES BY THE THORNBACK RAY, RAIA CLAVATA L., IN THE IRISH SEA

1964 ◽  
Vol 9 (3) ◽  
pp. 303-310 ◽  
Author(s):  
John Mauchline ◽  
Angela M Taylor
Keyword(s):  
Irish Sea ◽  
Thornback Ray ◽  
The Irish Sea

scholarly journals Morphological abnormality in thornback ray Raja clavata in the Irish Sea

2021 ◽  
Author(s):  
L. J. Clarke
Keyword(s):  
Irish Sea ◽  
Beam Trawl ◽  
Morphological Abnormality ◽  
Free Swimming ◽  
Pectoral Fins ◽  
North Wales ◽  
Head Section ◽  
Thornback Ray ◽  
Raja Clavata ◽  
The Irish Sea

AbstractA free-swimming thornback ray Raja clavata specimen demonstrating significant morphological abnormality is reported, captured by beam trawl in the Irish Sea off north Wales, UK. The anterior sections of both pectoral fins were separated from the head section for a length of approximately 140 mm extending from the rostrum tip to a point posterior of the spiracles, along with abnormal morphology of the gill slits. This phenomenon has been observed elsewhere but is the first documented example of this abnormality in the eastern Irish Sea, despite widespread targeting of the species across the region by commercial and recreational fishers. Possible causes and consequences of the observed abnormality are discussed.

Fifty years of tagging skates (Rajidae): using mark-recapture data to evaluate stock units

2019 ◽  
Vol 100 (1) ◽  
pp. 121-131 ◽  
Author(s):  
C. Bird ◽  
G. J. Burt ◽  
N. Hampton ◽  
S. R. McCully Phillips ◽  
J. R. Ellis
Keyword(s):  
Northern Ireland ◽  
Uncertain Data ◽  
Irish Sea ◽  
Mark Recapture ◽  
Straight Line ◽  
Thornback Ray ◽  
Raja Clavata ◽  
Elasmobranch Fish ◽  
The Status ◽  
The Irish Sea

AbstractDespite increased focus on ascertaining the status of elasmobranch fish, the stock units for many species are uncertain. Data from mark-recapture tagging studies undertaken from 1959–2017 were analysed for 13 batoid species. Data were most comprehensive for skates (Rajidae), with 22,374 released and 3342 (14.9%) returned. Most data related to thornback ray Raja clavata, blonde ray R. brachyura and spotted ray R. montagui. Tags were generally returned from areas less than 50 km from their release, and usually from the ICES Division in which they were released. However, straight-line distances travelled of up to 910 km (R. brachyura) and 772 km (R. clavata) were recorded, highlighting that individual skates are capable of longer-distance movements. The maximum time at liberty was 16.6 years (R. clavata). Whilst mark-recapture data indicated that the current stock units used by ICES are broadly appropriate, southward movements of several skate species tagged off Northern Ireland (Division 6.a) to the Irish Sea (Division 7.a) were observed. In contrast, skates tagged in the Irish Sea and Bristol Channel (Division 7.f) generally remained in that area, with only occasional recaptures from Division 6.a.

The medieval cultures of the Irish sea and the North Sea: Manannan and his neighbors [Book Review]

2019 ◽  
Vol 15 ◽  
pp. 142-144
Author(s):  
John Kennedy
Keyword(s):  
North Sea ◽  
Irish Sea ◽  
The North ◽  
The North Sea ◽  
The Irish Sea

Review(s) of: The medieval cultures of the Irish sea and the North Sea: Manannan and his neighbors, by MacQuarrie, Charles W., and Nagy, Joseph Falaky Nagy (eds), (Amsterdam: Amsterdam University Press, 2019) hardcover, 212 pages, 1 map, 4 figures, RRP euro99; ISBN 9789462989399.

A detailed comparison of measured and modeled wind-driven currents in the North Channel of the Irish Sea

2001 ◽  
Vol 106 (C9) ◽  
pp. 19683-19713 ◽  
Author(s):  
Alan M. Davies ◽  
Philip Hall ◽  
M. John Howarth ◽  
Philip Knight ◽  
Rose Player
Keyword(s):  
Detailed Comparison ◽  
Irish Sea ◽  
The North ◽  
The Irish Sea ◽  
Wind Driven Currents

scholarly journals Temporal trends in stock origin and abundance of juvenile herring (Clupea harengus) in the Irish Sea

2009 ◽  
Vol 66 (8) ◽  
pp. 1749-1753 ◽  
Author(s):  
Nóirín Burke ◽  
Deirdre Brophy ◽  
Pieter-Jan Schön ◽  
Pauline A. King
Keyword(s):  
Temporal Trends ◽  
Clupea Harengus ◽  
Irish Sea ◽  
First Year ◽  
Juvenile Abundance ◽  
Abundance Estimates ◽  
Otolith Microstructure Analysis ◽  
Celtic Sea ◽  
The Irish Sea ◽  
First Year Of Life

Abstract Burke, N., Brophy, D., Schön, P-J., and King, P. A. 2009. Temporal trends in stock origin and abundance of juvenile herring (Clupea harengus) in the Irish Sea. – ICES Journal of Marine Science, 66: 1749–1753. Celtic Sea herring (Clupea harengus) larvae partly disperse into the Irish Sea, where they mix with the resident stock during their first year of life. This affects the reliability of the use of acoustic estimates of juvenile abundance on the Irish Sea nursery grounds as a recruitment index for use in stock predictions. Otolith microstructure analysis can be used to distinguish between autumn-spawned and winter-spawned individuals. Because winter spawners do not occur in the Irish Sea, this component can be assigned to Celtic Sea immigrants. We used this method to estimate the proportion of winter-spawned individuals in samples of age-1 herring from the western Irish Sea over a 10-year period (1993–2003), and subtracted a corresponding proportion from the acoustic age-1 abundance estimates. The adjusted index for autumn-spawned (supposedly Irish Sea) juveniles was significantly correlated with the abundance of age-3 fish from the same year class in commercial catches and in the acoustic surveys (p < 0.05 and <0.01, respectively), whereas the correlations for unadjusted indices were not significant. These findings are discussed in relation to the monitoring and assessment of herring in the two areas.

Sign in / Sign up

Export Citation Format

Share Document