Presentation Abstract

Early marine juvenile growth in Pacific salmon is generally positively correlated with overall survival to reproductive age. In this study, regional patterns of juvenile salmon growth are being analyzed over a two-year period (2012-2013) in the Salish Sea and surrounding waters to better assess juvenile productivity, via growth, in the Salish Sea and surrounding waters to provide us insight into possible mechanisms regulating survival. Insulin-like growth factor-1 (IGF-1), a hormone used to assess instantaneous growth in fishes, including juvenile salmon, was measured in late June and early July of 2012 and 2013 in the Strait of Georgia, Johnstone Strait, Queen Charlotte Strait, and Puget Sound. Juvenile sockeye (Oncorhynchus nerka) and pink salmon (O. gorbuscha) were collected in 2012, whereas juvenile coho (O. kisutch), Chinook (O. tshawytscha), and chum salmon (O. keta) where obtained in both years. In 2012 IGF-1 levels were highest in pink salmon from the Gulf Islands and Puget Sound; this was a unique pattern among the 5 species of juvenile salmon sampled. Coho salmon IGF-1 levels were highest in samples from the Northern Strait of Georgia. Chinook salmon IGF-1 levels were significantly higher in the Strait of Georgia than Puget Sound. The only regions where IGF-1 values were consistently low for three of the four species were Queen Charlotte Strait and Johnstone Strait. Analyses of 2013 IGF-1 levels (juvenile coho, Chinook, chum and a low number of sockeye) are underway and scheduled plans to obtain samples in late June to early July of 2014 are in place.

Session Title

Session S-02D: Pelagic Ecology in the Salish Sea II

Conference Track

Species and Food Webs

Conference Name

Salish Sea Ecosystem Conference (2014 : Seattle, Wash.)

Document Type

Event

Start Date

30-4-2014 1:30 PM

End Date

30-4-2014 3:00 PM

Location

Room 611-612

Genre/Form

conference proceedings; presentations (communicative events)

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Subjects – Topical (LCSH)

Salmon--Salish Sea (B.C. and Wash.)--Growth

Geographic Coverage

Salish Sea (B.C. and Wash.)

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

Text

Language

English

Format

application/pdf

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Apr 30th, 1:30 PM Apr 30th, 3:00 PM

Assessing regional patterns of juvenile salmon growth in the Salish Sea

Room 611-612

Early marine juvenile growth in Pacific salmon is generally positively correlated with overall survival to reproductive age. In this study, regional patterns of juvenile salmon growth are being analyzed over a two-year period (2012-2013) in the Salish Sea and surrounding waters to better assess juvenile productivity, via growth, in the Salish Sea and surrounding waters to provide us insight into possible mechanisms regulating survival. Insulin-like growth factor-1 (IGF-1), a hormone used to assess instantaneous growth in fishes, including juvenile salmon, was measured in late June and early July of 2012 and 2013 in the Strait of Georgia, Johnstone Strait, Queen Charlotte Strait, and Puget Sound. Juvenile sockeye (Oncorhynchus nerka) and pink salmon (O. gorbuscha) were collected in 2012, whereas juvenile coho (O. kisutch), Chinook (O. tshawytscha), and chum salmon (O. keta) where obtained in both years. In 2012 IGF-1 levels were highest in pink salmon from the Gulf Islands and Puget Sound; this was a unique pattern among the 5 species of juvenile salmon sampled. Coho salmon IGF-1 levels were highest in samples from the Northern Strait of Georgia. Chinook salmon IGF-1 levels were significantly higher in the Strait of Georgia than Puget Sound. The only regions where IGF-1 values were consistently low for three of the four species were Queen Charlotte Strait and Johnstone Strait. Analyses of 2013 IGF-1 levels (juvenile coho, Chinook, chum and a low number of sockeye) are underway and scheduled plans to obtain samples in late June to early July of 2014 are in place.