Brian Davis

Fish Biologist, Brian Davis, collecting samples in the field. Brian is wearing an orange shirt, tan pants, tan hart and black sunglasses. He is reclining on the ground in a temperate rainforest setting with sampling equipment in front of him.
Fish Biologist - Natural Population Assessment

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

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About Brian Davis

Working with the Detection and Technology Group, most of Brians' duties are related to passive integrated transponder (PIT) tag technology; includes building, installing and maintaining antennas used to detect PIT tags. He currently works at PIT detection sites located at our National Fish Hatcheries, the upper Clackamas Basin, Tryon Creek and beyond. Brian also provides field support for various research projects around the office and conducts data collection, storage, cleaning, and analyses.

Brian is co-leading efforts to evaluate the use of YY male fish to extirpate Brook Trout from the water supply at Carson National Fish Hatchery. He is adept at using passive integrated transponder (PIT) technology to monitor the abundance, migration and survival of endangered and threatened fish, and as a result serves as the USFWS representative on the Instream PIT Tag Detection System Committee. Brian is also an avid R (programming language) user and is currently providing analytical support for the interagency-driven Oregon Bull Trout Strategy in the form of a decision support tool.

Program: Natural Population Assessment

Current Projects:

1. Modeling an invasive Brook Trout population and potential control methods to better understand how to eradicate them and other invasive species invasive species
An invasive species is any plant or animal that has spread or been introduced into a new area where they are, or could, cause harm to the environment, economy, or human, animal, or plant health. Their unwelcome presence can destroy ecosystems and cost millions of dollars.

Learn more about invasive species

2. Providing analytical support for making management decisions concerning Bull Trout conservation and recovery efforts in Oregon

3. Building, maintaining, and improving PIT tag detection systems

Past Projects:

1. Electrofishing in the South Fork Walla Walla River for a long-term Bull Trout population trend monitoring project

2. Electrofishing steelhead in Eagle Creek, Estacada for hatchery/wild interactions study

3. Chinook salmon reintroduction in the upper White Salmon as mitigation for the removal of Condit dam


Brian studied Fisheries Science at MT. Hood Community College before completing his degree at Oregon State University. 

At CRFWCO Since: 2008

Areas of expertise
Program R
PIT Tag Technology

From The Library

YY Male Brook Trout Stocking and Population Monitoring in Tyee Springs

Tyee Springs is located directly upstream of Carson National Fish Hatchery and is home to a thriving population of nonnative Brook Trout. This population has been a hatchery management concern and past attempts at suppressing or eradicating the Brook Trout population have been unsuccessful In...

Feasibility Assessment of Stocking YY Males to Eradicate Nonnative Brook Trout from Tyee Springs

An established population of nonnative Brook Trout resides in Tyee Springs directly upstream from Carson National Fish Hatchery. The potential for Brook Trout to escape from Tyee Springs and enter the hatchery is a concern because the hatchery releases spring Chinook yearlings into the Wind...

Evaluation of adult Pacific Lamprey upstream passage at Warm Springs National Fish Hatchery FY 2018 Annual Report

Population declines of Pacific Lamprey Entosphenus tridentatus in the Columbia River Basin are partially attributed to impediments to upstream spawning migration of adults. To promote adult Pacific Lamprey passage, fishway modifications have been installed at both high-head and low-head dams...

Clackamas River Bull Trout Reintroduction Project 2017 Annual Report

Over 40 years after the last bull trout (Salvelinus confluentus) was documented in the Clackamas River in 1963, a 2007 feasibility study determined the Clackamas River Subbasin to be a promising candidate for bull trout reintroduction. A reintroduction effort began in 2011, with the goal of re-...

Eagle Creek Hatchery-Wild Steelhead Ecological Interactions: Comparative abundance, growth, migration behavior and survival of winter steelhead in upper Eagle and North Fork Eagle Creeks

Eagle Creek National Fish Hatchery spawns and rears juvenile coho salmon (Oncorhynchus kisutch) and winter steelhead trout (O. mykiss) that are released into Eagle Creek within the Clackamas River basin, Oregon. Previous investigations on the ecological and genetic impacts of...

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