|Document Type:||Journal Article|
|Title:||Tidal movements and residency of subyearling Chinook salmon (Onchorhynchus tschawytcha) in an Oregon salt marsh channel|
|Author:||David K. Hering, Daniel L. Bottom, Earl F. Prentice, K. K. Jones, I. A. Fleming|
|Journal:||Canadian Journal of Fisheries and Aquatic Sciences|
|Keywords:||Chinook salmon, salt marsh, PIT-tag, estuary|
A novel application of full-duplex passive integrated transponder (PIT)tag technology was used to investigate movements of individual subyearling Chinook salmon (Oncorhynchus tshawytscha; fork length ! 60 mm) into and out of tidally flooded salt marsh habitat in the Salmon River estuary, Oregon, USA. PIT interrogation was effective, with mean tag detection ! 92%. Salmon movement peaked late during both flood and ebb tide periods, indicating that salmon did not drift passively. Most movements were in the direction of tidal currents, but 20% of individuals entered the channel against the ebbing tide. Individuals occupied the intertidal channel for a median 4.9 h and as long as 8.9 h per tidal cycle, and few were detected moving when water depth was <0.4 m. Some individuals used the channel on multiple successive tidal cycles, and others entered intermittently over periods of up to 109 days. Using an individual-based approach, we characterized diversity of juvenile Chinook salmon behavior within a marsh channel, providing insight into the value of such habitats for conservation and restoration of salmon populations.