Combination effect of hot smoking and vacuum packaging on quality parameters of refrigerated thornback ray (Raja clavata Linnaeus, 1758)

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.

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The Effect of Azide, Fluoride, Orthovanadate and EDTA Sodium Salts on Ecto-ATPase Activity in Erythrocytes of a Scorpionfish (Scorpaena porcus L.) and Thornback Ray (Raja clavata L.)

Journal of Evolutionary Biochemistry and Physiology ◽

10.1134/s0022093021050033 ◽

2021 ◽

Vol 57 (5) ◽

pp. 1008-1019

Author(s):

Yu. A. Silkin ◽

E. N. Silkina ◽

M. Yu. Silkin

Keyword(s):

Atpase Activity ◽

Sodium Salts ◽

Thornback Ray ◽

Raja Clavata ◽

Scorpaena Porcus

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THE LIVER LIPID FATTY ACID COMPOSITION OF TWO CARTILAGINOUS FISH, THE THORNBACK RAY (Raja clavata) AND THE COMMON SMOOTH-HOUND (Mustelus mustelus)

AQUATIC RESEARCH ◽

10.3153/ar19012 ◽

2019 ◽

pp. 143-153

Author(s):

Cahide Çiğdem Yığın ◽

Fikret Çakır ◽

Koray Cabbar ◽

Bayram Kızılkaya ◽

Hasan Basri Ormancı ◽

...

Keyword(s):

Fatty Acid Composition ◽

Fatty Acid ◽

Acid Composition ◽

Liver Lipid ◽

Cartilaginous Fish ◽

Lipid Fatty Acid ◽

Thornback Ray ◽

Raja Clavata ◽

The Common ◽

Lipid Fatty Acid Composition

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Diet and feeding strategy of thornback ray, Raja clavata (Chondrichthyes: Rajidae) from the Gulf of Gabes (Tunisia—Central Mediterranean Sea)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315414000587 ◽

2014 ◽

Vol 94 (7) ◽

pp. 1509-1516 ◽

Cited By ~ 4

Author(s):

Hasna Kadri ◽

Sondes Marouani ◽

Mohamed Nejmeddine Bradai ◽

Abderrahmen Bouaïn

Keyword(s):

Feeding Strategy ◽

Stomach Contents ◽

Ontogenetic Changes ◽

Central Mediterranean ◽

Gulf Of Gabes ◽

Gulf Of Gabès ◽

Thornback Ray ◽

Raja Clavata ◽

Food And Feeding ◽

Quantitative Analyses

Food and feeding strategy of the thornback ray, Raja clavata, were studied from stomach contents analysis of specimens caught monthly in the Gulf of Gabes. The data were analysed according to sex, size and season. At total of 1280 stomachs was examined, from specimens ranging from 14 to 110 cm total length (TL), of which 1076 (83.98%) contained food. Thornback ray feed mainly on teleosts, crustaceans and cephalopods, whereas gastropods and polychaetes are occasionally consumed. Significant differences were found between the diets of males and females; however, ontogenetic changes were also detected, with crustaceans constituting the greatest proportion of the diet of smaller rays. Both teleosts and cephalopods increased in importance with growth of the skates. Prey diversity increased with size; large and mobile prey species were more commonly found in the diet of larger skates. Diet composition showed seasonal variations. Quantitative analyses and graphical methods indicate that the thornback ray is a generalist feeder.

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