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  • 1
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    Length and age at maturity of female petrale sole (Eopsetta jordani) determined from samples collected prior to spawning aggregation (2021)
    In:  http://aquaticcommons.org/id/eprint/15244 | 403 | 2014-05-30 21:18:10 | 15244 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-05
    Description: The problem of bias in female petrale sole age and length-at-maturity relationships caused by sampling from spawning aggregations was investigated. Samples were collected prior to aggregation, and histological methods were used to determine maturity status. Mature and immature fish were classified by inspecting oocytes for the presence of yolk in September, when substantial divergence in yolked and unyolked oocyte diameters had been observed. Comparison of macroscopic and microscopic assessment of maturity showed that maturity status cannot be determined accurately by using macroscopic inspection during the summer. Female petrale sole from the central Oregon coast were 50% mature at 33 cm and 5 years of age. Comparison of data from our study with data used in recent petrale sole stock assessments showed that both sampling bias and the use of samples from sea-sons when status cannot be accurately determined have likely caused errors in fitted maturity relationships.
    Keywords: Biology
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 711-719
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  • 2
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    Accuracy of sex determination for northeastern Pacific Ocean thornyheads (Sebastolobus altivelis and S. alascanus) (2021)
    In:  http://aquaticcommons.org/id/eprint/8760 | 403 | 2012-06-11 18:32:21 | 8760 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Determining the sex of thornyheads (Sebastolobus alascanusand S. altivelis) can be difficult under field conditions. We assessed our ability to correctly assign sex in the field by comparing results from field observations to results obtained in the laboratory through both macroscopicand microscopic examination of gonads. Sex of longspine thornyheads was more difficult to determine than that of shortspine thornyheads and correct determination of sexwas signif icantly related to size. By restricting the minimum size of thornyheads to 18 cm for macroscopicdetermination of sex we reduced the number of fish with misidentified sex by approximately 65%.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 226-232
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    PAPER (OA)
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