June 2022 - 34
" We always take great efforts to not
influence fish behavior when tagging fish
for movement studies because it would
provide biased data and not reflect what the
population as a whole may be doing, " said
Siddons, another co-leader of the study. " By
selecting the smallest tag possible for each
species, we believe this isn't an issue. "
Prior to capture efforts, and with the
Marshall Stuart, a Game and Fish fisheries technician, holds a shovelnose sturgeon after it was implanted with a radio tag.
The radio transmitter antenna dangles outside the fish to increase the detection range. (WGFD photo)
support of local landowners, four stationary
telemetry receivers were constructed - two
on the Powder River and two on Clear Creek
- to track the fish. The stations feature two
antennas, one facing upstream and one facing
downstream. A fish's direction of travel can be
determined based on which antenna picks up
the signal first. A data recorder and solar panel
for charging the battery system completes
the unit.
" The receiver hears the tag and deciphers
the tag's unique code so we know which
specific fish we are encountering, " Siddons
said. " The radio tags are generally detectable
one-quarter to a half mile away. "
" We always take great efforts
to not influence fish behavior
when tagging fish for movement
studies because it would provide
biased data and not reflect what
the population as a whole may be
doing. " - Stephen Siddons
In addition to the stationary receivers
that wait for signals from a passing tagged
fish, Edwards, Siddons and others actively
tracked fish on foot with handheld telemetry
equipment and two aerial surveys were
conducted in August and November.
Fish biologists consider the size of radio tags they implant in fish to ensure they aren't too large. (WGFD photo)
34 | June 2022
TAGS IN THE WATER
During the 2021 field season 63 fish were
radio-tagged.
Twenty-three sauger were captured and
radio-tagged, with 17 detected in later
months. Most of them stayed close to
where they were tagged, but one motivated
individual traveled 47 miles upstream in just
over two weeks.
June 2022
Table of Contents for the Digital Edition of June 2022
June 2022 - 1
June 2022 - 2
June 2022 - 3
June 2022 - 4
June 2022 - 5
June 2022 - 6
June 2022 - 7
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