• Home
  • Latest Updates
  • About Brook Trout
  • Research
    • Ongoing Studies
    • Previous Work
  • Who We Are
  • Contact Us
  The Troutlook

A brook trout Blog

How far do brook trout move?

6/12/2016

1 Comment

 
Picture"Stream prettiness" wasn't a factor I considered when picking study sites, but it worked out in my favor.
The answer to that question is that I’m not entirely sure (see the previous research section for why there is confusion). But, this summer I started an eight month study of brook trout movement patterns in the Loyalsock Creek watershed in Pennsylvania to help determine the answer. I’ll be providing regular updates on this project through this blog, but, before I begin, let’s talk a little about the methods I’m using.
 
​I’m studying movement patterns using radio telemetry. This process involves surgically implanting a small tag (0.0005 pounds) inside the abdominal cavity of a fish. Attached to the tag is a thin antenna wire that is passed through the abdominal wall and remains outside of the fish. Radio telemetry is a fairly common method for studying movement in a variety of fish species. So, if you ever catch a fish with a wire hanging out from its side, there’s a good chance its part of a radio telemetry study (and the researchers would be very grateful if you put it back!).
 
Every five seconds the tag transmits a signal that can be picked up by a receiver. Researchers either mount stationary receivers in locations of high movement or, in my case, walk around with the receiver and an antenna in search for signals coming from tags. When a signal is picked up, the receiver reads out two important pieces of information:
  • A tag identification number that is unique to each fish.  This allows us to track individual fish movements to see if some fish are “movers” and others “stayers.”
  • The temperature of the water the fish is currently swimming in. We know that brook trout prefer water temperatures around 60F, and we can easily stick a thermometer in the stream to determine the average temperature.  However, when stream temperatures increase, coldwater fish are sometimes good at finding small pockets of very cold water (stayed tuned for more on this topic…), and we want to know if brook trout are able to do this.
 
This summer we tagged 103 brook trout with radio telemetry tags. These fish are spread out across four streams, and we track each individual about twice a week to see how changes in stream flow or temperature may trigger fish to move.
 
The battery life of the tags is about 150 days, so I am planning to track summer movement into August, and then tag an additional 60 fish in late summer to monitor fall spawning movement. The prediction is that low stream flows and high temperatures in summer with limit movement.  But, come late September, fish will begin moving to access spawning habitat.  Previous studies have shown that some trout can move over 3 miles to spawn, so needless to say I didn’t renew my gym membership for the fall.
 
The telemetry tagging was just one part of the data that I am collecting this summer.  Stay tuned to hear about why (and how) we draw blood from fish, why I know some fish are shy, and how I build a trout's family tree. 

Picture
Tagging a fish is a true surgery, complete with sutures to close the incision.
1 Comment
Bill Ensign
6/12/2016 07:39:10 pm

Good luck Shannon! I look forward to hearing about the results as they come in.

Reply



Leave a Reply.

    Tweets by TheTroutlook

    Author

    Shannon White

    ​​​​Archi​ves

    October 2018
    September 2018
    August 2018
    June 2018
    May 2018
    April 2018
    March 2018
    February 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016
    June 2016

    ​Categories

    All
    Behavior
    Career Advice
    Genetics
    Literature
    Miscellaneous
    Not Trout
    Personality
    Telemetry

    RSS Feed

Proudly powered by Weebly
  • Home
  • Latest Updates
  • About Brook Trout
  • Research
    • Ongoing Studies
    • Previous Work
  • Who We Are
  • Contact Us