The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific

Journal of Fish Diseases
By: , and 

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Abstract

The protistan parasite Ichthyophonus occurred in populations of Pacific herring Clupea pallasii Valenciennes throughout coastal areas of the NE Pacific, ranging from Puget Sound, WA north to the Gulf of Alaska, AK. Infection prevalence in local Pacific herring stocks varied seasonally and annually, and a general pattern of increasing prevalence with host size and/or age persisted throughout the NE Pacific. An exception to this zoographic pattern occurred among a group of juvenile, age 1+ year Pacific herring from Cordova Harbor, AK in June 2010, which demonstrated an unusually high infection prevalence of 35%. Reasons for this anomaly were hypothesized to involve anthropogenic influences that resulted in locally elevated infection pressures. Interannual declines in infection prevalence from some populations (e.g. Lower Cook Inlet, AK; from 20–32% in 2007 to 0–3% during 2009–13) or from the largest size cohorts of other populations (e.g. Sitka Sound, AK; from 62.5% in 2007 to 19.6% in 2013) were likely a reflection of selective mortality among the infected cohorts. All available information for Ichthyophonus in the NE Pacific, including broad geographic range, low host specificity and presence in archived Pacific herring tissue samples dating to the 1980s, indicate a long-standing host–pathogen relationship.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific
Series title Journal of Fish Diseases
DOI 10.1111/jfd.12370
Volume 39
Issue 4
Year Published 2016
Language English
Publisher Wiley
Contributing office(s) Western Fisheries Research Center
Description 16 p.
First page 395
Last page 410
Country Canada, United States
State Alaska, British Columbia, California, Washington
Other Geospatial Pacific Ocean
Online Only (Y/N) N
Additional Online Files (Y/N) N