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Assessments to determine the effect of current and alternate ladder operations on brood stock collection and behavior of hatchery fall Chinook Salmon at Spring Creek National Fish Hatchery during 2003-2005

Summary

Type of release
a one-off release of a single dataset

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
16 May 2015
Modified Date
16 May 2015
Publishers
US Fish and Wildlife Service, Department of the Interior
Keywords
fisheries-management, management, natural-resources-management
Identifier
assessments-to-determine-the-effect-of-current-and-alternate-ladder-operations-on-bro-2003
Landing Page
http://catalog.data.gov/dataset/assessments-to-determine-the-effect-of-current-and-alternate-ladder-operations-on-bro-2003
Maintainers
Richard Easterbrook richard_easterbrook@fws.gov

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Description

Spring Creek National Fish Hatchery traditionally operates an adult ladder, without closure, from the start of the tule fall Chinook salmon run in late August until the run ceases in early October. Ladder operation is continuous during the tule fall Chinook salmon run to receive all hatchery origin fish. In recent years, Spring Creek NFH has recorded large returns of adult tule fall Chinook salmon often with several thousand fish entering the hatchery each day of the hatchery run. An alternative approach to ladder operations at Spring Creek NFH was attempted in 2003 with several half day and one full day ladder closure near the end hatchery run. Another large hatchery escapement 40,000 fish was expected during 2004 and during 2005 50,000. An assessment of the 20042005 ladder closures was planned with the following objectives: to determine if hatchery brood stock includes tule fall Chinook salmon not allowed access to the hatchery during a ladder closure; and to determine if the behavior of tule fall Chinook salmon changes during intermittent ladder closure, specifically if intermittent ladder closure increases natural spawning and straying of Spring Creek NFH returning adults.

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