PCD Risk 1: A tool for assessing and reducing ecological risks of hatchery operations in freshwater

Pearsons, Todd N.; Busack, Craig A.

doi:10.1007/s10641-011-9926-8

Cited by 5 publications

(1 citation statement)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, long‐term monitoring of spring Chinook Salmon populations in the Wenatchee River watershed indicated density‐dependent growth and survival of naturally produced spring Chinook Salmon (Hillman et al 2019). However, modeling using the PCD (predation–competition–disease) Risk 1 model in the Wenatchee River subbasin (Pearsons and Busack 2012) suggested that ecological risks associated with the White River program were within acceptable limits for the nontarget taxa that were evaluated (Pearsons et al 2012; Mackey et al 2014). In contrast to the findings for the Yakima River, where large numbers of hatchery‐origin minijacks were observed below the spawning grounds and few were found on the spawning grounds (Pearsons et al 2009), we detected a large number of minijacks on the spawning grounds.…”

Section: Discussionmentioning

confidence: 99%

Distribution and straying of minijack Chinook Salmon released from a captive broodstock hatchery program

2023

View full text Add to dashboard Cite

Objective: Production of Chinook Salmon Oncorhynchus tshawytscha in hatcheries can unintentionally produce large numbers of age-1 males, termed "minijacks," which pose ecological and genetic risks to target and nontarget populations. We evaluated the postrelease distribution of minijacks produced in a hatchery captive broodstock program targeting the White River in the Columbia River basin between 2010 and 2015.Methods: Fish were passive integrated transponder (PIT)-tagged in the hatchery (n = 218,555), and databases were searched to determine movement behavior and final detections on fixed PIT tag antenna arrays during the year in which they were released.Result: Two main movement behaviors were detected: (1) residuals, which moved solely within the subbasin of release; and (2) migrants, which moved downstream into the Columbia River and then reascended the Columbia River in the year of release. Minijacks that reascended fish ladders in the Columbia River were most often detected at Rock Island and Bonneville dams, the nearest and furthest detection locations downstream of the Wenatchee River. Minijacks were last detected in all locations where spring Chinook Salmon spawn in the Wenatchee River subbasin (seven tributaries and one main-stem area) and also in the Entiat River (an adjacent watershed); minijacks in eight of the nine locations were considered strays.Estimates of minijacks that strayed outside of the White River were between 61% and 100% annually and were influenced by release location. Minijacks were also more abundant than males of all older ages in some of the tributaries during some years.In addition, they were detected in these tributaries during periods when anadromous adults migrate into spawning areas and when spring Chinook Salmon spawn. Conclusion:The large amount of minijack production and the spatial and temporal overlap could pose genetic and ecological risks to both target and nontarget populations and particularly high straying poses risks to the maintenance of betweenpopulation genetic variability.

show abstract

Section: Discussionmentioning

confidence: 99%

Distribution and straying of minijack Chinook Salmon released from a captive broodstock hatchery program

2023

View full text Add to dashboard Cite

show abstract

Prevalence of Infection in Hatchery‐Origin Chinook Salmon Correlates with Abundance of Ceratonova shasta Spores: Implications for Management and Disease Risk

Robinson

Alexander

Hallett

et al. 2020

N American J Fish Manag

View full text Add to dashboard Cite

Ceratonova shasta is an endemic myxozoan parasite that impacts salmonid populations in the Klamath River (USA). High densities of C. shasta actinospores negatively affect the survival of migrating juvenile salmonids. Each year, approximately five million fall‐run Chinook Salmon Oncorhynchus tshawytscha smolts are released from a hatchery that is located below Iron Gate Dam, and they travel through an infectious zone where the densities of C. shasta spores are elevated and when disease risk is often highest. We examined several documented hypotheses regarding potential factors that contribute to the effects of C. shasta on salmonids in the Klamath River. Our results suggest that hatchery‐origin smolts may exacerbate the effects of the disease, as evidenced by an associative relationship between the prevalence of infection in out‐migrating hatchery fish with the densities of waterborne C. shasta spores in subsequent seasons (the following fall and spring). We found no evidence that the number of natural spawners, another potential contributor of spores, predicted peak spore density the following spring. Our findings warrant consideration in discussions of hatchery releases and management of flow regimes, and they identify avenues for future research to advance our understanding of how to reduce the adverse effects of C. shasta on salmonids in the Klamath River.

show abstract

Ecological risk assessment of multiple hatchery programs in the upper Columbia watershed using Delphi and modeling approaches

et al. 2011

Self Cite

View full text Add to dashboard Cite

Ecological risks of Pacific salmon (spring, summer, and fall run Chinook, coho, and sockeye salmon) and steelhead trout hatchery programs operated between 2013 and 2023 in the Upper Columbia Watershed will be assessed using Delphi and modeling approaches. Committees composed of resource managers and public utility districts identified non-target taxa of concern (i.e., taxa that are not the target of supplementation), and acceptable hatchery impacts (i.e., change in population status) to those taxa. Biologists assembled information about hatchery programs, non-target taxa, and ecological interactions and this information will be provided to expert panelists in the Delphi process to facilitate assessment of risks and also used to populate the Predation, Competition, and Disease (PCD) Risk 1 model. Delphi panelists will independently estimate the proportion of a non-target taxa population that will be affected by each individual hatchery program. Estimates from each of the two approaches will be independently averaged, a measure of dispersion calculated (e.g., standard deviation), and subsequently compared to the acceptable hatchery impact levels that were determined previously by committees of resource managers and public utility districts. Measures of dispersion will be used to estimate the scientific uncertainty associated with risk estimates. Delphi Environ Biol Fish (2012) 94:87-100 and model results will be compared to evaluate the qualities of the two approaches. Furthermore, estimates of impacts from each hatchery program will be combined together to generate an estimate of cumulative impact to each non-target taxon.

show abstract

PCD Risk 1: A tool for assessing and reducing ecological risks of hatchery operations in freshwater

Cited by 5 publications

References 49 publications

Distribution and straying of minijack Chinook Salmon released from a captive broodstock hatchery program

Distribution and straying of minijack Chinook Salmon released from a captive broodstock hatchery program

Prevalence of Infection in Hatchery‐Origin Chinook Salmon Correlates with Abundance of Ceratonova shasta Spores: Implications for Management and Disease Risk

Ecological risk assessment of multiple hatchery programs in the upper Columbia watershed using Delphi and modeling approaches

Contact Info

Product

Resources

About