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Caractères biométriques distinctifs de l'embryon et de ses annexes chez la roussette (Scyliorhinus canicula) de la Manche comparée à celle de la Méditerranée, et détermination précise du stade d'éclosion = Biometric differences between dogfish (Scyliorhinus canicula) embryos from the Channel and Mediterranean, and their yolk sacs, with a new description of the hatching stage
Mellinger, J.; Wrisez, F.; Alluchon-Gérard, M.-J. (1984). Caractères biométriques distinctifs de l'embryon et de ses annexes chez la roussette (Scyliorhinus canicula) de la Manche comparée à celle de la Méditerranée, et détermination précise du stade d'éclosion = Biometric differences between dogfish (Scyliorhinus canicula) embryos from the Channel and Mediterranean, and their yolk sacs, with a new description of the hatching stage. Cah. Biol. Mar. 25(3): 305-317
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 
  • Mellinger, J.
  • Wrisez, F.
  • Alluchon-Gérard, M.-J.

Abstract
    Compared to dogfish embryos of Mediterranean origin, at an equal size, those obtained from the Channel (near Roscoff) showed much heavier bodies during the latest stages of development, and they had at their disposal higher amounts of yolk in the oocyte, and in their external (EYS) and internal yolk sacs (IYS). At hatching, sizes themselves differed by about 1.5 cm. The remarkable delay from the end of EYS resorption to hatching (1 /5th of whole developmental period) corresponded to a steady increase of body weight; it represents a newly described, ultimate stage in this development. Hatching was accompanied by a sudden eruption of ordinary scales and teeth, which seems to denote a common physiological control.

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