2010
DOI: 10.1017/s0025315410001906
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Preliminary observations on the life history and movements of skates (Rajidae) around the Island of Jersey, western English Channel

Abstract: The most frequently caught skate species around Jersey include blonde ray Raja brachyura, undulate ray Raja undulata, small-eyed ray Raja microocellata and thornback ray Raja clavata. Between September 2006 and December 2008, a total of 814 individuals were tagged and released, of which 64% were small-eyed ray, 22.6% blonde ray and 12.4% undulate ray. The size distribution, sex-ratio and maturity of these samples are summarized. There were 138 reported recaptures (return rate ¼ 17.1%), with most fish recapture… Show more

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Cited by 24 publications
(24 citation statements)
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“…These findings suggest that individuals of these two species may exhibit limited dispersal from the initial capture origin, and thus reflect the isotopic composition of local resource pools. Such observations are in-line with existing contentions for skates more broadly, suggesting that individuals generally exhibit limited dispersal (Templeman 1984, Ellis et al 2011, Stephan et al 2013, and assumingly forage primarily within localized food-webs. Finally, it is unlikely that sizestructure may drive the spatial variation in stable isotope signatures, as immature and mature individuals are found throughout the range for species examined, and size-based relationships do not explain large amounts of deviance (i.e.…”
Section: Discussionsupporting
confidence: 87%
“…These findings suggest that individuals of these two species may exhibit limited dispersal from the initial capture origin, and thus reflect the isotopic composition of local resource pools. Such observations are in-line with existing contentions for skates more broadly, suggesting that individuals generally exhibit limited dispersal (Templeman 1984, Ellis et al 2011, Stephan et al 2013, and assumingly forage primarily within localized food-webs. Finally, it is unlikely that sizestructure may drive the spatial variation in stable isotope signatures, as immature and mature individuals are found throughout the range for species examined, and size-based relationships do not explain large amounts of deviance (i.e.…”
Section: Discussionsupporting
confidence: 87%
“…Ontogenetic differences in habitat use have also been identified in R. clavata with younger individuals occurring in shallower areas over fine sand or mud, while older individuals are more widely dispersed and inhabit deeper waters (Martin et al 2012). However, a study by Ellis et al (2011) showed that, around Jersey (Channel Islands, UK), R. clavata show greater site fidelity than in other locations and therefore, these animals seem to exhibit considerable behavioural plasticity. Thus it is likely that the complex movements and migrations of these animals could lead to fine-scale distributions, habitat preferences or segregations that have not been detected by trawl surveys or other large-scale studies.…”
Section: Discussionmentioning
confidence: 99%
“…There are no published studies on population genetics and whilst there is some information on the associated parasites in Galician waters, comparable information is lacking for elsewhere in its range. Limited data from tagging studies are available (Ellis et al , 2011), which have indicated a high site fidelity, and such work could usefully be extended to other regions to better understand their movements and potential connectivity between areas of abundance. Similarly, the use of electronic tags could provide more robust information on the home range of R. undulata .…”
Section: Current Management and Conservation Status Of R Undulatamentioning
confidence: 99%