Prediction and confirmation of seasonal migration of Pacific sardine (Sardinops sagax) in the California Current Ecosystem

Demer, David A. and Zwolinski, Juan P. and Byers, Kyle A. and Cutter, George R. and Renfree, Josiah S. and Sessions, Thomas S. and Macewicz, Beverly J. (2012) Prediction and confirmation of seasonal migration of Pacific sardine (Sardinops sagax) in the California Current Ecosystem. Fishery Bulletin, 110(1), pp. 52-70.

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Abstract

During the last century, the population of Pacific sardine (Sardinops sagax) in the California Current Ecosystem has exhibited large fluctuations in abundance and migration behavior. From approximately 1900 to 1940, the abundance of sardine reached 3.6 million metric tons and the “northern stock” migrated from offshore of California in the spring to the coastal areas near Oregon, Washington, and Vancouver Island in the summer. In the 1940s, the sardine stock collapsed and the few remaining sardine schools concentrated in the coastal region off southern California, year-round, for the next 50 years. The stock gradually recovered in the late 1980s and resumed its seasonal migration between regions off southern California and Canada. Recently, a model was developed which predicts the potential habitat for the northern stock of Pacific sardine and its seasonal dynamics. The habitat predictions were successfully validated using data from sardine surveys using the daily egg production method; scientific trawl surveys off the Columbia River mouth; and commercial sardine landings off Oregon, Washington, and Vancouver Island. Here, the predictions of the potential habitat and seasonal migration of the northern stock of sardine are validated using data from “acoustic–trawl” surveys of the entire west coast of the United States during the spring and summer of 2008. The estimates of sardine biomass and lengths from the two surveys are not significantly different between spring and summer, indicating that they are representative of the entire stock. The results also confirm that the model of potential sardine habitat can be used to optimally apply survey effort and thus minimize random and systematic sampling error in the biomass estimates. Furthermore, the acoustic–trawl survey data are useful to estimate concurrently the distributions and abundances of other pelagic fishes.

Item Type: Article
Title: Prediction and confirmation of seasonal migration of Pacific sardine (Sardinops sagax) in the California Current Ecosystem
Personal Creator/Author:
CreatorsEmail
Demer, David A.
Zwolinski, Juan P.
Byers, Kyle A.
Cutter, George R.
Renfree, Josiah S.
Sessions, Thomas S.
Macewicz, Beverly J.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 110
Number: 1
Page Range: pp. 52-70
Date: January 2012
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8690
Depositing User: Patti M. Marraro
Date Deposited: 07 Jun 2012 14:48
Last Modified: 07 Jun 2012 14:48
URI: http://aquaticcommons.org/id/eprint/8690

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