White Sturgeon Mitigation and Restoration in The Columbia and Snake Rivers Upstream from Bonneville Dam Project Washington Department of Fish and Wildlife
Stock Assessment & Fisheries Monitoring Stock Assessment & Fisheries Monitoring Recruitment Monitoring Recruitment Monitoring Juvenile Transplants Juvenile Transplants Hatchery Releases Hatchery Releases Maturation Cycle Maturation Cycle White Sturgeon Mitigation and Restoration
Stock Assessment & Fisheries Monitoring Total Length Year Sum Bonneville Reservoir ,40041,8003, , ,50033,0001, ,420 +2%-21%-68%-80%+95%-7% The Dalles Reservoir ,90013,5005,9001, , ,60010,2001, ,825 +9%-24%-81%-58%-50%-1% John Day Reservoir ,90012,8001, , ,20011,5001, , %-10%+2%-43%-48%+45%
Population trends in John Day Reservoir Total Length (inches) Year Sum , , ,4824,0451,00730, ,6681,0771,08729, ,7621, ,
Harvest Stock Assessment & Fisheries Monitoring
Recruitment Monitoring
Year The Dalles John Day 19942, , ,2575, , ,1634, ,2575, , , All15,25127,248 Juvenile Transplants 2005
Recaptures of Juvenile Sturgeon Transplants
Hatchery Releases Brood YearBrood Source Collected M : FRelease Date Release Location Release Number 1999 McNary/ Wanapum 6 : McNary 14 : McNary 23 : 4 Sep-02John Day McNary/ LCR 19 : 2 Apr-03Rock Island12, McNary/ LCR 19 : 2 Sep-03Rock Island8, McNary/ LCR 17 : 3 Sep-03Willamette40,000
Sex and Maturity Correct Classification of Sex & Maturity Using of Plasma Steroids 63% of the non-reproductive females 52% of the non-reproductive males 97% of the reproductive females 87% of the reproductive males
Males capable of spawning every year Majority of males are not spawning every year Females appear to be spawning every 2 to 5+ years with the majority of females displaying a 3+ to 5+ year cycle Maturation Cycle below Bonneville Dam
Update Snake River Stock Assessments Update Snake River Stock Assessments Adjust Capture Methods for Juvenile Transplants Adjust Capture Methods for Juvenile Transplants Regional Management Plan - Hatchery releases - Set population targets Regional Management Plan - Hatchery releases - Set population targets Future
White Sturgeon Mitigation and Restoration Project