Embryonic respiration in the dogfish(Scyliorhinus caniculaL.)

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Abstract
Dogfish eggs would appear to be eminently suitable for physiological study because of their large size, easy availability (egg laying seems to be continuous throughout the year except for a break during the autumn (Craik, 1978)); their long lasting development (between 240 and 300 days from laying to hatching (Foulley & Mellinger, 1980a)); the clear separation between yolk-sac and embryo, and the fact that eggs are normally laid in pairs (opening up the possibility of keeping one of them as control whilst experimenting upon the other).