This study determined which kokanee stock performed best in Lake Roosevelt, WA: Lake Whatcom, Meadow Creek, or F1 mixed stock. The F1 mixed stock was created by collecting eggs from Lake Whatcom, Meadow Creek and non-marked kokanee that returned to Hawk Creek and raising them to the residualized smolt stage at the Spokane Tribal hatchery for release back into Lake Roosevelt. Fall spawning run data (2009 – 2012) were analyzed to assess the percentage and sex ratios of each stock returning to spawn in Lake Roosevelt. We had record returns of hatchery kokanee in 2009 (n = 8,895) and 2010 (n = 8,925), but poor returns in 2011 (n = 423) and 2012 (n = 1,893). The F1 mixed stock significantly outperformed the Lake Whatcom and Meadow Creek stocks for both return percentage (P <0.001) and sex ratios (P <0.001) in each year. The record kokanee returns of 2009 and 2010 coincided with relatively shallow drawdown and longer water retention times, whereas, the poor 2011 and 2012 returns coincided with a deep drawdown and shorter water retention times.
","abstract_html":"<p>This study determined which kokanee stock performed best in Lake Roosevelt, WA: Lake Whatcom, Meadow Creek, or F1 mixed stock. The F1 mixed stock was created by collecting eggs from Lake Whatcom, Meadow Creek and non-marked kokanee that returned to Hawk Creek and raising them to the residualized smolt stage at the Spokane Tribal hatchery for release back into Lake Roosevelt. Fall spawning run data (2009 – 2012) were analyzed to assess the percentage and sex ratios of each stock returning to spawn in Lake Roosevelt. We had record returns of hatchery kokanee in 2009 (n = 8,895) and 2010 (n = 8,925), but poor returns in 2011 (n = 423) and 2012 (n = 1,893). The F1 mixed stock significantly outperformed the Lake Whatcom and Meadow Creek stocks for both return percentage (P <0.001) and sex ratios (P <0.001) in each year. The record kokanee returns of 2009 and 2010 coincided with relatively shallow drawdown and longer water retention times, whereas, the poor 2011 and 2012 returns coincided with a deep drawdown and shorter water retention times.</p>","abstract_has_math":false,"creators":["Blake, Alix O."],"institution":null,"degree_name":"Master of Science (MS) in Biology","degree_level":"Thesis","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Allan Scholz","A. Ross Black","Doris Munson"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-01-01T08:00:00Z","date_published":"2013-01-01T08:00:00Z","updated_at":"2026-07-24T02:13:00Z","subjects":["Kokanee salmon--Washington (State)--Franklin D. Roosevelt Lake","Kokanee salmon--Migration--Washington (State)--Franklin D. Roosevelt Lake","Hatchery releases--Washington (State)--Franklin D. Roosevelt Lake--Evaluation","Fish stocking--Washington (State)--Franklin D. Roosevelt Lake--Evaluation","Fish stock assessment--Washington (State)--Franklin D. Roosevelt Lake","Biology"],"languages":[],"rights":["Access is available to all users"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://dc.ewu.edu/theses/131","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Allan Scholz","A. Ross Black","Doris Munson"]},{"key":"dc:creator","label":"Author","values":["Blake, Alix O."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS) in Biology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Kokanee salmon--Washington (State)--Franklin D. Roosevelt Lake","Kokanee salmon--Migration--Washington (State)--Franklin D. Roosevelt Lake","Hatchery releases--Washington (State)--Franklin D. Roosevelt Lake--Evaluation","Fish stocking--Washington (State)--Franklin D. Roosevelt Lake--Evaluation","Fish stock assessment--Washington (State)--Franklin D. Roosevelt Lake","Biology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["Access is available to all users"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://dc.ewu.edu/theses/131"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This study determined which kokanee stock performed best in Lake Roosevelt, WA: Lake Whatcom, Meadow Creek, or F1 mixed stock. The F1 mixed stock was created by collecting eggs from Lake Whatcom, Meadow Creek and non-marked kokanee that returned to Hawk Creek and raising them to the residualized smolt stage at the Spokane Tribal hatchery for release back into Lake Roosevelt. Fall spawning run data (2009 – 2012) were analyzed to assess the percentage and sex ratios of each stock returning to spawn in Lake Roosevelt. We had record returns of hatchery kokanee in 2009 (n = 8,895) and 2010 (n = 8,925), but poor returns in 2011 (n = 423) and 2012 (n = 1,893). The F1 mixed stock significantly outperformed the Lake Whatcom and Meadow Creek stocks for both return percentage (P <0.001) and sex ratios (P <0.001) in each year. The record kokanee returns of 2009 and 2010 coincided with relatively shallow drawdown and longer water retention times, whereas, the poor 2011 and 2012 returns coincided with a deep drawdown and shorter water retention times.
"]},{"key":"dc:title","label":"Title","values":["Assessment of the hatchery kokanee (Oncorhynchus nerka) release program in Lake Roosevelt 2009 -- 2012"]}]}],"canonical_facts":{"dc:contributor":["Allan Scholz","A. Ross Black","Doris Munson"],"dc:creator":["Blake, Alix O."],"dc:description.abstract":["This study determined which kokanee stock performed best in Lake Roosevelt, WA: Lake Whatcom, Meadow Creek, or F1 mixed stock. The F1 mixed stock was created by collecting eggs from Lake Whatcom, Meadow Creek and non-marked kokanee that returned to Hawk Creek and raising them to the residualized smolt stage at the Spokane Tribal hatchery for release back into Lake Roosevelt. Fall spawning run data (2009 – 2012) were analyzed to assess the percentage and sex ratios of each stock returning to spawn in Lake Roosevelt. We had record returns of hatchery kokanee in 2009 (n = 8,895) and 2010 (n = 8,925), but poor returns in 2011 (n = 423) and 2012 (n = 1,893). The F1 mixed stock significantly outperformed the Lake Whatcom and Meadow Creek stocks for both return percentage (P <0.001) and sex ratios (P <0.001) in each year. The record kokanee returns of 2009 and 2010 coincided with relatively shallow drawdown and longer water retention times, whereas, the poor 2011 and 2012 returns coincided with a deep drawdown and shorter water retention times.
"],"dc:identifier":["https://dc.ewu.edu/theses/131"],"dc:rights":["Access is available to all users"],"dc:subject":["Kokanee salmon--Washington (State)--Franklin D. Roosevelt Lake","Kokanee salmon--Migration--Washington (State)--Franklin D. Roosevelt Lake","Hatchery releases--Washington (State)--Franklin D. Roosevelt Lake--Evaluation","Fish stocking--Washington (State)--Franklin D. Roosevelt Lake--Evaluation","Fish stock assessment--Washington (State)--Franklin D. Roosevelt Lake","Biology"],"dc:title":["Assessment of the hatchery kokanee (Oncorhynchus nerka) release program in Lake Roosevelt 2009 -- 2012"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS) in Biology"]},"updated_at":"2026-07-24T02:13:00Z"}