Spine-based ageing methods in the spiny dogfish shark, Squalus suckleyi: How they measure up
The second dorsal spine has historically been used for age determination in the spiny
dogfish shark. The dorsal spines are located on the external surface of the body and are
subjected to natural wear and breakage. Two methods have been developed to account for
the worn portion of the spine and extrapolate the lost annuli. We compared the performance
of these methods using a large data collection assembled from multiple sources, and
evaluated their utility for stock assessment and management of the spiny dogfish shark …
dogfish shark. The dorsal spines are located on the external surface of the body and are
subjected to natural wear and breakage. Two methods have been developed to account for
the worn portion of the spine and extrapolate the lost annuli. We compared the performance
of these methods using a large data collection assembled from multiple sources, and
evaluated their utility for stock assessment and management of the spiny dogfish shark …
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