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Using Mulit-beam and Split-beam Hydroacoustic Technology to Detect & Track Ultrasonic Tagged Fish.

Milne Technologies announces collaborative project with the Ontario Ministry of Natural Resources, Kongsberg-Mesotech Simrad Ltd., Echoview Software Pty. Ltd., and the University of Toronto at Mississauga.

The proposed study provided a method for directly measuring the in situ target strength of lake trout using integrated multibeam, split beam and biotelemetry technologies. Pulse coded ultrasonic tags engineered to ping at 200 kHz will be surgically implanted into lake trout and released. The study area will be surveyed with an SM2000 multibeam sonar and an EK60 multi-frequency echosounder system in an effort to locate and track tagged fish. Data recorded will include target strength measurements, habitat information, and information about potential prey items.

From this work we expect to provide a target strength and frequency response model for lake trout that will incorporate fish size and activity patterns (swimming speed and angle) under varying light conditions. This work will also provide a unique opportunity to describe the spatial distribution and behavioural patterns of lake trout as they relate to the schooling behaviour of their prey.

Objectives

1. To provide a methodology for detecting and uniquely identifying lake trout implanted with ultrasonic tags using a     SM2000 multibeam acoustic system.
2. To estimate the in situ target strength and frequency response of lake trout in relation to fish size, target
    depth, and activity.
3. To describe the predatory behaviour of lake trout in response to the spatial distribution of the prey.
4. To demonstrate the use of an integrated remote sensing methodology and its application in describing the
     trophic transfer dynamics of an oligotrophic ecosystem.
5. To determine the frequency response of single targets as a method of classifying species in a mixed          assemblage oligotrophic system.

Field Work

This work was completed out of the Harkness Laboratory of Fisheries Research on Lake Opeongo, Algonquin Park, Canada. The field work began at the end of June and continued through July, 2007.

Preliminary Results - Lake Trout Interactions

Click on the following links to replay a series of echogram segments that were recorded from the 2007 tracking surveys. Shown below are examples for several tagged lake trout.

Lake Trout Tag Number
Date
Link
Tag ID "1" (22 Mb)
July 6, 2007
Tag ID "1"
July 15, 2007
Tag ID "2"
July 14, 2007
Tag ID "2" a (11 Mb)
July 17, 2007
Tag ID "2" b (6 Mb)
July 17, 2007
Tag ID "4" a (7 Mb)
July 16, 2007
Tag ID "4" b
July 16, 2007
Tag ID "6" (6 Mb)
July 5, 2007
Tag ID "6"
July 17, 2007
Tag ID "8" (9 Mb)
July 11, 2007
Tag ID "14"
July 15, 2007
Tag ID "15"
July 16, 2007

Note: You will require Adobe FlashPlayer to view the media content . Download it here.

Preliminary Results - Lake Trout Movement

Click on the following links to view the movements of tagged lake trout throughout the study period.  Results have been summarized by the date of the survey and by the lake trout tag number.

Lake Trout Position Fixes by Survey Date
Lake Trout Position Fixes by Tag Number
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