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Reproductive biology and age at maturity of shortspine thornyhead (Sebastolobus alascanus) in Alaska



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  • Journal Title:
    Fishery Bulletin
  • Personal Author:
    TenBrink, Todd
  • NOAA Program & Office:
  • Description:
    Ovaries from female shortspine thornyhead (Sebastolobus alascanus) collected in the Aleutian Islands and Gulf of Alaska from 2014 through 2016 were used to investigate aspects of the reproductive biology of this species. Although this species is abundant in both geographical areas, published data on its reproduction remain limited. Ovaries were examined histologically to assess their development and to determine length and age at maturity. The seasonality of ovarian development was similar between geographical areas, with females spawning in May and June. Mature ovaries in early developing phases were observed in October. For females, length at 50% maturity was 23.0 cm in fork length (FL) (95% confidence interval [CI]: 22.3–23.8 cm FL), and age at 50% maturity was 12.8 years (95% CI: 12.00–13.51 years), with all of them maturing at ages between 11 and 14 years. Precision in age estimates between readers was acceptable (coefficient of variation=9.45; average percent error=6.69; percent agreement=25.9%), compared with that in estimates for difficult-to-age rockfish species (Sebastes spp.). This study resulted in additional knowledge of the reproductive biology of the shortspine thornyhead and greater understanding of its life history for fisheries management. Larger sample sizes and greater spatiotemporal coverage for sampling of specimens for aging are necessary to further identify maturity of this species and differences between geographical areas.
  • Source:
    Fishery Bulletin, 123(4), 235-250
  • DOI:
  • ISSN:
    0090-0656
  • Format:
    pdf
  • Publisher:
    NMFS Scientific Publications Office
  • Document Type:
    Journal Article
  • License:
  • Rights Information:
    CC0 Public Domain
  • Compliance:
    Submitted
  • Main Document Checksum:
    urn:sha-512:e127a33703d38c61a0f29e5600a429092a306814d4f9841d04aa290ec218ad3637783bac9821f1f37dd2fc5e5ff7a834b7bed179fca4bbab196d871f804d8318
  • Download URL:
  • File Type:
    Filetype[PDF - 11.78 MB ]
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