Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 8720
Title: Diel shifts in salmonid fry micro-habitat selection
Author: David Hines, Martin Liermann, Tiffany Seder, Brian Cluer, G. R. Pess, Casey Shoenebeck
Publication Year: 2017
Journal: North American Journal of Fisheries Management
Volume: Early view
Keywords: steelhead,coho,diel movement,depth,

Diel shifts in habitat selection of newly emerged steelhead Oncorhynchus mykiss and coho salmon Oncorhynchus kisutch fry were investigated in three Northern California coastal watersheds.  Steelhead and coho salmon fry occupied shallow water near stream margins both day and night, however the proportion of fry within 0.5 m of the stream margin increased from 6% during the day to 44% at night.  Similarly, the proportion of fry in 10 cm of water or less increased from 26% during the day to 76% at night.  Reductions in depth and distance to stream margins were significant at all sites, suggesting these behaviors are common attributes for stream rearing salmonids in this region.  These results also suggest newly emerged fry are potentially vulnerable to becoming stranded with changes in stream water surface area, particularly at night.  While our observations were undertaken to better understand the risks to salmonids from vineyard water use for frost protection, the results have implications for any anthropogenic stream flow changes during the spring period.

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Theme: Habitats to Support Sustainable Fisheries and Recovered Populations
Foci: Characterize relationships between habitat and ecosystem processes, climate variation, and the viability of organisms.