Levels of stored energy but not Marine foraging patterns differentiate seasonal ecotypes of wild and hatchery Steelhead returning to the Kalama River, Washington
|Title||Levels of stored energy but not Marine foraging patterns differentiate seasonal ecotypes of wild and hatchery Steelhead returning to the Kalama River, Washington|
|Written by||James S. Lamperth, Thomas P. Quinn, Mara S. Zimmerman|
|From||Washington Department of Fish and Wildlife, USA|
University of Washington, USA
|Published||June 10, 2016|
|Fish Species||Steelhead (Oncorhynchus mykiss)|
What the research is about
Study was to compare energy storage, as indicated by somatic lipids (SL), and marine foraging, as indicated by stable isotopes of N and C, between seasonal runs of steelhead of wild and hatchery origin. We did so by sampling steelhead returning to the Kalama River in southwestern Washington, including summer and winter fish of hatchery and wild origins.
The results revealed complex processes controlling the storage of energy needed for migration, reproduction, and postspawning survival in steelhead and, by extension, other anadromous fishes. After controlling for the distance the fish migrated, the two seasonal runs differed markedly in stored energy upon arrival; earlier-arriving fish had more energy than those arriving later, and wild fish tended to have more energy than hatchery fish.
Assurant Innovations take
Fish Fat Meter was used to measure total lipid (fat) in the fish which is a key indicator of stored energy.