Kelp Greenling (Hexagrammos decagrammus) Growth, Spawning Seasonality, and Female Length at Maturity Based on Histological Evaluation of Ovaries from Oregon Waters, Information Report 2015-02

Identification Information

Citation

Originator: Rodomsky, Brett T., Lisa A. Kautzi, Robert W. Hannah, and Craig D. Good

Publish Date: 2015

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Cedric Cooney

Job Position: Natural Resources Data and Systems Manager

Telephone: 503-947-6094

E-Mail Address: cedric.x.cooney@odfw.oregon.gov

Description

Abstract: This is the ninth publication in a series documenting results from a long-term sampling program aimed at developing improved life history data for groundfish species commonly captured in Oregon fisheries. When this study was begun in 2000, the available life history data for many U.S. west coast groundfish species were of questionable quality. Length-weight relationships, age-at-length, and reproductive seasonality were either poorly known or derived from very limited sampling. In addition, the maturity curves then used in stock assessment models were typically based on macroscopic (visual) assessment of maturity status. However, studies have shown that histological evaluation of ovarian thin-sections, especially if combined with optimal seasonal sampling, is much more accurate (Gunderson et al. 1980, Wyllie Echeverria 1987, West 1990, Nichol and Pikitch 1994, Hannah and Parker 2007). In previous publications in this series, improved female maturity data have been developed for Petrale Sole (Eopsetta jordani, Hannah et al. 2002), Pacific Ocean Perch (Sebastes alutus, Hannah and Parker 2007), Yelloweye Rockfish (S. rubberimus) and Cabezon (Scorpaenichthys marmoratus, Hannah et al. 2009), Aurora Rockfish (S. aurora, Thompson and Hannah 2010), Quillback (S. maliger) and China Rockfish (S. nebulosus, Hannah and Blume 2011), Vermilion Rockfish (S. miniatus, Hannah and Kautzi 2012), Copper Rockfish (S. caurinus, Hannah 2014), and Blue-sided (S. diaconus) and Blue Rockfish (S. mystinus, Hannah et al. 2015). This report describes the development of length-at-weight, age-at-length, spawning seasonality, and histologically-based female length-at-maturity life history parameters for Kelp Greenling (Hexagrammos decagrammus).

Purpose:

Time Period of Content:

Geographic Extent: Oregon

Status: Final

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Format: PDF

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Is a physical copy maintained for reference at Headquarters? Unknown