Reproductive potential of light dusky rockfish (Sebastes variabilis) and northern rockfish (S. polyspinis) in the Gulf of Alaska
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Reproductive potential of light dusky rockfish (Sebastes variabilis) and northern rockfish (S. polyspinis) in the Gulf of Alaska

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  • Journal Title:
    Fishery Bulletin
  • Personal Author:
    Conrath, Christine L.
  • NOAA Program & Office:
  • Description:
    The reproductive potential of northern rockfish (Sebastes polyspinis) and light dusky rockfish (S. variabilis) in the Gulf of Alaska was examined by measuring the success of oocyte and embryo development. The potential annual fecundity, reproductive failure rates, and relationships of these parameters to maternal size were examined. Both species have a seasonally synchronous reproductive cycle with parturition occurring in the late spring to early summer. Northern rockfish had a mean relative fecundity of 165.1 oocytes/g for specimens captured in December and 109.6 embryos/g for specimens captured in May. Light dusky rockfish had a mean relative fecundity of 152.1 oocytes/g for specimens collected in December and 108.1 embryos/g for specimens captured in May. Reproductive failure was easiest to discern for the samples from fish collected in May, with partial and total failure primarily occurring because of lack of oocyte development or fertilization failure. Northern rockfish had a rate of total reproductive failure or skipped spawning of 16.3%, and light dusky rockfish had a total reproductive failure rate of 15.6%. As light dusky and northern rockfish grow larger throughout their lives, their relative fecundities increase and the likelihood of reproductive failure decreases. Fecundity values, failure rates, and maternal effects on the reproductive potential of these species can be used to inform future stock assessments.
  • Keywords:
  • Source:
    Fish. Bull. 117:140–150 (2019)
  • DOI:
  • Document Type:
    Journal Article
  • Place as Subject:
    Gulf of Alaska (Alaska)
  • Rights Information:
    Public Domain
  • Compliance:
    Submitted
  • Main Document Checksum:
  • Download URL:
  • File Type:

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