Relationship between abundance of juvenile rockfishes (Sebastes spp.) and environmental variables documented off northern California and potential mechanisms for the covariation

Laidig, Thomas E. and Chess, James R. and Howard, Daniel F. (2007) Relationship between abundance of juvenile rockfishes (Sebastes spp.) and environmental variables documented off northern California and potential mechanisms for the covariation. Fishery Bulletin, 105(1), pp. 39-48.

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Abstract

We estimated annual abundance of juvenile blue (Sebastes mystinus), yellowtail (S. f lavidus), and black (S. melanops) rockfish off northern California over 21 years and evaluated the relationship of abundance to oceanographic variables (sea level anomaly, nearshore temperature, and offshore Ekman transport). Although mean annual abundance was highly variable (0.01−181 fish/minute), trends were similar for the three species. Sea level anomaly and nearshore temperature had the strongest relationship with interannual variation in rockfish abundance, and offshore Ekman transport did not correlate with abundance. Oceanographic events occurring in February and March (i.e., during the larval stage) had the strongest relationship with juvenile abundance, which indicates that year-class strength is determined during the larval stage. Also of note, the annual abundance of juvenile yellowtail rockfish was positively correlated with year-class strength of adult yellowtail rockfish; this finding would indicate the importance of studying juvenile abundance surveys for management purposes.

Item Type: Article
Title: Relationship between abundance of juvenile rockfishes (Sebastes spp.) and environmental variables documented off northern California and potential mechanisms for the covariation
Personal Creator/Author:
CreatorsEmail
Laidig, Thomas E.
Chess, James R.
Howard, Daniel F.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 105
Number: 1
Page Range: pp. 39-48
Date: 2007
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Management
Item ID: 8904
Depositing User: Patti M. Marraro
Date Deposited: 18 Jun 2012 09:31
Last Modified: 18 Jun 2012 09:31
URI: http://aquaticcommons.org/id/eprint/8904

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