Background

The goal of the Yakama Nation Pacific Lamprey Restoration Project (Project) is to restore natural production of Pacific lamprey in the Yakama Nation Ceded Lands, specifically,  the Wind, White Salmon, Little White Salmon, Klickitat, Yakama, Wenatchee, Methow, and Entiat river systems.  Very little information exists about lamprey abundance and distribution or limiting factors throughout the Ceded lands.  One of the primary objectives over the next couple years is to survey key habitats and collect baseline information that will be used to develop long-term restoration strategies for each of the named subbasins.  Other key objectives within this time frame will be to evaluate potential use for artificial propagation of juveniles and and translocation of adult lampreys.  These latter objectives are likely to be used as a tool to help re-establish or supplement natural production in selected watersheds.  

Over the next year, the Project will continue focusing efforts in program development, regional coordination and surveying key habitats in various subbasins for lamprey abundance, distribution and potential primary limiting factors.  
The long-term Project objectives are as follows:

• Consolidate and summarize current, historical information related to Pacific lamprey distribution and abundance within the Yakama Nation Ceded lands.
• Identify lamprey adult and juvenile migration characteristics.
• Identify current habitat strongholds for ammocoete rearing.  Quantify and index relative densities of ammocoetes.
• Describe known and / or potential factors that contribute to relatively strong or weak ammocoete production in key (or index) watersheds.  
• Describe key habitat characteristics that may contribute or are related to juvenile growth and productivity.
• Measure weights of ammocoete and lengths to correlate, if possible age class and annual productivity.
• Identify the key limiting factors that prevent juveniles from successfully hatching, staging and achieving high levels of productivity in preferred habitats.  
• Identify key areas where adults hold and/or spawn.  Identify environmental / physiological conditions that trigger spawning to occur.
• Describe key habitat characteristics that may contribute or are related to adult holding and/or spawning.
• Identify the key limiting factors that prevent adults from successfully migrating and/or spawning.
• Identify known and suspected passage barriers to adult lamprey migration.
• Identify actions that can be taken to restore or enhance adult holding and spawning.