Ebert (1986) provides information on the biology of Hexanchus griseus, but notes that three methods tested to age them proved unsuccessful.
The ageing of spiny sharks like Squalidae is possible based on the spines and vertebrae (see Cannizzarro et a., 1995; Tribuzio et al., 2010; Cotton et al., 2011; Bubley et al. 2012).
Bubley, W. J., Kneebone, J., Sulikowski, J. A. & Tsang, P. C. W. (2012): Reassessment of spiny dogfish Squalus acanthias age and growth using vertebrae and dorsal-fin spines. J. Fish Biol. 80: 1300-1319.
Cannizzarro, L., Rizzo, P., Levi, D. & Gancitano, S. (1995) Age determination and growth of Squalus blainvillei (Risso, 1826). Fish: Res. 23: 113-125.
Cotton, C. F., Grubbs, R. D., Daly-Engel, T. S. & Lynch, P. D. (2011) Age, growth and reproduction of a common deep-water shark, shortspine spurdog (Squalus cf. mitsukurii), from Hawaiian waters. Mar. Freshw. Res 62: 811-822.
Ebert, D. A. (1986): Biological aspects of the sixgill shark, Hexanchus griseus. Copeia 1986 (1): 131-135.
Tribuzio, C. A., Kruse, G. H. & Fujioka, J. T. (2010) Age and growth of spiny dogfish (Squalus acanthias) in the Gulf of Alaska: analysis of alternative growth models. Fish. Bull. 108 (2): 119-135.
Dear all,
thx for answers.
Yes, we done everything acording to procedure reported in McFarlane et al. (2002) but it seems that vertebrae are not calcified at all (:-)! I will pas through all proposed literature. I will inform you about eventual sucess.
Thx once again,
Sanja
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