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3 Alaska Fisheries Science Center National Marine Fisheries Service, NOAA 17109 Point Lena Loop Road Juneau, Alaska 99801 Abstract—Spiny dogfish (Squalus acanthias) are traditionally aged by counting band pairs on dorsalfin spines; however, wear and tear of the spines make obtaining accurate age estimates of older spiny dogfish difficult. Vertebral centra are an alternate structure that can be used to estimate age, but success in their use has been varied. We conducted a tagrecapture study using oxytetracycline injections to validate annual deposition in both dorsalfin spines and vertebral centra of spiny dogfish. When band pairs in vertebral centra were used, time at liberty was significantly underestimated. Additionally, bandpair counts were found to change along the vertebral column of an individual, further refuting the use of vertebral centra to generate age estimates. Bandpair deposition in dorsalfin spines was confirmed to be annual in spiny dogfish at liberty for up to 2.6 years. Dorsalfin spines should continue to be used to age spiny dogfish, and vertebral centra are not a viable alternative.

fishery bulletin

Validation of the use of vertebrae and dorsal-fin spines for age determination of spiny dogfish (Squalus acanthias) in the western North Atlantic Ocean