email HTI home
Hydroacoustic Technology, Inc.
  Hydroacoustic Technology, Inc.    
Featured Case Study  
 
 
University of Washington's Friday Harbor LaboratorySee Project Pics - Watch Videos - GoPro with the Divers See Project Pics Detecting Fish Presence Using Acoustic Tags
at Electrical Barriers

  
Location: Eagle Creek National Fish Hatchery, Estacada, Oregon, USA

Project Leads: Dave Ouellette, Pat Nealson




Preparation and installation of the electrical barrier. Image: Smith-RootPreparation and installation of the electrical barrier. Image: Smith-Root

Objectives:

In Oregon, the Eagle Creek National Fish Hatchery works to ensure the sustainability of migrating salmon and trout. Each year, the hatchery collects eggs from Steelhead Trout, Chinook Salmon and Coho Salmon during different migratory periods. The eggs are used to produce smolts later released back into Eagle Creek to begin their downstream migration to the Pacific Ocean. This location was the site for an important feasibility test where researchers set out to find out if it was possible to detect fish presence using HTI acoustic tags in the presence of the pulsed field of direct current generated by a Smith-Root Electrical Barrier.

With an output of up to 9 kW of electricity pulsating in this 1-2 ft deep waterway, the concern was that the electrical signals from the barrier would interfere with the HTI acoustic system preventing detection of the tag signals. And with the shallow depths and slow velocities, there were also concerns about data loss due to tag signal collisions.

Results:

The feasibility tests concluded that neither the challenge of the electrical noise nor the shallow depths with slow velocities presented issues for detecting fish tagged with HTI acoustic tags.

The barrier at Eagle Creek is effective and continues to help sustain fish numbers in our waterways for the future. HTI is pleased to work with Smith Root as they continue to provide innovative technology to divert migrating fish species such as Steelhead, Chinook and Coho Salmon into the adjacent hatchery for egg production.

To learn more about the equipment or methods used, contact Colleen or Bruce at (206) 633-3383 or email them at support@HTIsonar.com.



 

Danger! Electric fish barrier ahead. Image: D.Ouellette
Danger! Electric fish barrier ahead. Signs of things to come. Image: D.Ouellette
Acoustic tag detection without filtering electrical noise from the Smith-Root Electrical Barrier. Image:
Acoustic tag detection without filtering electrical noise from the Smith-Root Electrical Barrier. Image: D.Ouellette
Acoustic tag detection with filtering electrical noise from the Smith-Root Electrical Barrier. Image: D.Ouellette
Acoustic tag detection with filtering electrical noise from the Smith-Root Electrical Barrier. Image: D.Ouellette
Electrical barrier in place and helping to divert migrating fish species into the adjacent hatchery for egg production. Image: D.Ouellette
Electrical barrier in place and helping to divert migrating fish species into the adjacent hatchery for egg production. Image: D.Ouellette
This feasibility test proved that HTI Acoustic Tags can be detected in close proximity to the Smith-Root Electric Barrier Fence. - Dave Ouellette, Sr. Fisheries Biologist

- Dave Ouellette, Sr. Fisheries Biologist
 
 
 
 
More Case Studies

Investigating Passage: Behavioural Studies of Upstream Moving Salmonids

Hands-On Mobile Surveys Using Hydroacoustic Echo Sounders, Seattle-Style

Collaborative Efforts: Developing a Marine Acoustic Tag Tracking System for Fine-Scale Behavioral Research

Tracking Fine-Scale Movement of Dock Shrimp Kelp Crab in the San Juan Archipelago with Marine Bioacoustics Workshop Students

Tracking Alligator Gar at Steinhart Aquarium

Investigating Downstream Passage of American Eel

Hydroacoustic Sampling Fish Passage at Boundary Dam

Monitoring Movement of Multi-Species Assemblages with Acoustic Telemetry at the Seattle Aquarium

Monitoring Fish in Noisy Tailraces of Hydroelectric Dams, Três Marias Brazil


 > More Case Studies
Helpful Links
Newsletter UpdateIndustry NewsAdditional ResourcesRequest More Info



































































 
© Hydroacoustic Technology, Inc. (206) 633-3383     support@HTIsonar.com