Posts tagged: Isurus

The Study Of Pelagic Species

Despite the methodological limitations of the reproductive study of elasmobranchs and the specific limitations on the study of pelagic species, some general trends in the reproduction of these species can be identifi ed. First, none of the pelagic species exhibit the oviparous mode of reproduction. Obviously, this mode would be unsuitable in an open ocean [...]

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Monday April 12th, 2010 in , , , , , , , , , , , , , , , , , , , , , | No Comments »

White Shark Reproduction is Very Poorly Understood

The lamniform sharks (family Alopiidae, genus Alopias; and family Lamnidae, genera Lamna, Isurus, and Carcharodon) all exhibit aplacental viviparity with embryonic oophagy. Only the right ovary is functional (Pratt, 1988; Gilmore, 1993). After the ova are fertilized, they are packaged singly in egg capsules, called blastodisc capsules, in the nidamental gland. These capsules then move [...]

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Sunday April 11th, 2010 in , , , , , , , , , , , , , , , , , , , , | No Comments »