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The potential use of caudal thorns as a non-invasive ageing structure in the thorny skate (Amblyraja radiata Donovan, 1808)

  • Michael J. Gallagher
  • Marianne J. Green
  • Conor P. Nolan
Chapter
Part of the Developments in Environmental Biology of Fishes book series (DEBF, volume 25)

Abstract

The thorny skate, Amblyraja radiata, is the most widely distributed and abundant of all skate species worldwide, found on both sides of the north Atlantic Ocean. Large inter-regional size differences exist for this species and the few age and growth studies undertaken have revealed marked differences in life history traits for geographically distinct stocks. To facilitate the progression of further age and growth studies for this commercially important species, the effectiveness of caudal thorns as a rapid ageing tool was assessed. Twenty-eight male and 24 female thorny skates were collected off Greenland, covering the full size range of the species. Replicate age readings of crystal violet stained vertebral sagittal sections and whole silver nitrate stained caudal thorns revealed mean intra-reader age reading precision was higher for caudal thorns (Covariance (CV): reader 1 = 9.07, reader 2 = 9.73) than vertebrae (CV: reader 1 = 14.91, reader 2 = 14.27). Age bias plots revealed minimal inter-structure bias, apart from a higher average thorn age reading of 0.76 years from age classes 5–11 years for reader 1. Minor inter-reader bias was evident for vertebrae only; averaging 0.90 years higher for reader 1 from age classes 11 to 15 years. Preliminary evidence suggests caudal thorns could prove an effective non-invasive ageing tool for thorny skates.

Keywords

Skate Age Caudal thorns Vertebrae Bias 

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Michael J. Gallagher
    • 1
  • Marianne J. Green
    • 2
  • Conor P. Nolan
    • 1
  1. 1.Irish Sea Fisheries BoardKillybegs, Co.DonegalIreland
  2. 2.Killybegs Fishermen’s OrganisationKillybegs, Co.DonegalIreland

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