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l'Encéphale de Scyliorhinus canicula (Linné, 1758) (Chondrichthyes, Selacii, Scyliorhinidae): recherche d'une grandeur de référence pour des études quantitatives = The brain of Scyliorhinus canicula (Linnaeus, 1758) (Chondrichthyes,Selacii, Scyliorhinidae): quantitative study
Ridet, J.-M.; Bauchot, R.; Delfini, Ch.; Platel, R.; Thireau, M. (1973). l'Encéphale de Scyliorhinus canicula (Linné, 1758) (Chondrichthyes, Selacii, Scyliorhinidae): recherche d'une grandeur de référence pour des études quantitatives = The brain of Scyliorhinus canicula (Linnaeus, 1758) (Chondrichthyes,Selacii, Scyliorhinidae): quantitative study. Cah. Biol. Mar. 14(1): 11-28
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Ridet, J.-M.
  • Bauchot, R.
  • Delfini, Ch.
  • Platel, R.
  • Thireau, M.

Abstract
    After a concise description of the brain of Scyliorhinus canícula (L.) (Dogfish), the various correlations between brain-weight, body-w eight and other linear measurements such as total size, preanal length, predorsal length and the length of the head are studied by the means of statistical methods on a sample of 66 individuals. Contrary to what is known about land Vertebrates and Teleosts, the quick action of the Bouin’s fluid on the Scyliorhinus’ brain is a w eight increase of about 12 p. 100 during the first 2.30 hours before the usual decrease. In Scyliorhinus canicula (L.), the intraspecifial brain-body-weight relation shows an allometric coefficient of about 0.56 (reduced major axis : 0.566; regression coefficient: 0.533; ellipse principal axis: 0.560), which is higher than in the other Vertebrates previously studied (Mammals: 0.23 - Bauchot et Stephan, 1964; Saurians: 0.391 - Platel, 1972). The analysis of the relation between body-weight, or brain-weight, and lengths allowed us to say that, total length excepted, the linear measurements cannot be used as independant variates; the only one variation of the total length follows closely the brain-weight and the body-weight variations: Pe/b, r = 0.9754; b/Ps, r = 0.9873.

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