Julie Harris

Julie Harris, Biometrician at CRFWCO, holding a juvenile Pacific Lamprey in the palm of her hand while wearing a black hoodie. Julie is standing next to bushes in a natural setting
Aquatic Statistician - Natural Population Assessment, Passage and Habitat Assessment
Columbia River Fish and Wildlife Conservation Office
Fish and Aquatic Conservation
Address

1211 SE Cardinal Court
Suite 100
Vancouver, WA 98683
United States

(360) 604-2500
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About Julie Harris

Julie’s main responsibilities are to conduct and support study design, data analysis, demographic modeling, and writing for studies completed at CRFWCO to support conservation and management of fish, fisheries, and aquatic habitats in the Columbia River Basin. Julie also provides statistical support to other fisheries professionals and to the National Wildlife Refuges Program. Julie is involved in information exchange and conservation of Pacific Lamprey. In addition, Julie is the coordinator of the CRFWCO monthly seminar series.

Program: Natural Population Assessment   Passage and Habitat Assessment

Current Projects:

1. Examining patterns in Pacific Lamprey occupancy and abundance in the Columbia River Basin

2. Estimating vital rates to help assess the feasibility of stocking YY Males to eradicate Brook Trout from an isolated Washington stream

3. Identifying trends in abundance and distribution of birds in the Fitzner-Eberhardt Arid Lands Ecology Reserve on the Hanford Reach National Monument.

Past Projects: 

1. Harris, J.E., J.J. Skalicky, T.L. Liedtke, L.K. Weiland, B.J. Clemens, and A.E. Gray. 2020. Effects of dewatering on behavior, distribution, and abundance of larval lampreys. River Research and Applications 36:2001-2012.

2. Harris, J.E. 2020. Assessing accuracy and bias of protocols to estimate age of Pacific salmon using scales. North American Journal of Fisheries Management 40:1007-1022. 

3. Clemens, B.J., L. Weitkamp, K. Siwicke, J. Wade, J. Harris, J. Hess, L. Porter, K. Parker, T.M. Sutton, and A.M. Orlov. 2019. Marine biology of the Pacific lamprey Entosphenus tridentatus. Reviews in Fish Biology and Fisheries 29:767-788.

4. Harris, J.E., C. Newlon, P.J. Howell, R.C. Koch, and S.L. Haeseker. 2018. Modeling individual variability in growth of bull trout in the Walla Walla River Basin using a hierarchical von Bertalanffy growth model. Ecology of Freshwater Fish 27(1):103-115.

5. Harris, J.E., and J.C. Jolley. 2017. Estimation of occupancy, density, and abundance of larval lampreys in tributary river mouths upstream of dams on the Columbia River, Washington and Oregon. Canadian Journal of Fisheries and Aquatic Sciences74(6):843-852. 

6. Hightower, J.E., and J.E. Harris. 2017. Estimating fish mortality rates using telemetry and multistate models. Fisheries 42(4):210-219.

At CRFWCO since: 2013

Additional roles
Co-organizer for the annual Lamprey Technical Information Exchange
Coordinating and executing the CRFWCO monthly seminar series
Associate Editor for the American Fisheries Society Marine and Coastal Fisheries Journal
Areas of expertise
Study Design
Data Analysis

From The Library

Reliability of visual surveys and eDNA sampling to detect a new invasion of New Zealand mudsnail
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Reliability of visual surveys and eDNA sampling to detect a new invasion of New Zealand mudsnail

Early detection and monitoring of aquatic invasive species (AIS) are vital in preventing their establishment and reducing their spread in aquatic habitats. The New Zealand mudsnail (NZMS), Potamopyrgus antipodarum, is an invasive aquatic snail that poses a threat to National Fish Hatcheries (...

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An evaluation of batch marking techniques for larval lampreys
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An evaluation of batch marking techniques for larval lampreys

Pacific Lamprey Entosphenus tridentatus is an ecologically important anadromous species native to the Pacific Northwest region and a species of concern in the Columbia River basin (Close et al., 2002, Wang and Schaller 2015). Pacific Lamprey have declined in distribution due to anthropogenic...

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Assessment of Larval Lamprey Use of Dredged Materials Placed in the Columbia River at Woodland Islands for Beneficial Use, Summary Report 2023
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Assessment of Larval Lamprey Use of Dredged Materials Placed in the Columbia River at Woodland Islands for Beneficial Use, Summary Report 2023

Across their native range, many lamprey species have declined in distribution and abundance (Close et al., 2002; Maitland et al., 2015; Clemens et al., 2017, 2021). For all lamprey species, the life cycle includes a multi-year larval stage during which they burrow into fine sediments for up to...

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Estimating the Abundance of Adfluvial Bull Trout Spawning in Cougar Creek
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Estimating the Abundance of Adfluvial Bull Trout Spawning in Cougar Creek

In response to a general decline in abundance across their native range, Bull Trout (Salvelinus confluentus) were listed as threatened under the Endangered Species Act in 1999. Gaining a better understanding of the reproductive component of a population is important for Bull Trout recovery and...

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Estimating the Abundance of Adfluvial Bull Trout Spawning in Cougar Creek
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Estimating the Abundance of Adfluvial Bull Trout Spawning in Cougar Creek

In response to a general decline in abundance across their native range, Bull Trout (Salvelinus confluentus) were listed as threatened under the Endangered Species Act in 1999. Gaining a better understanding of the reproductive component of a population is important for Bull Trout recovery and...

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