Monthly Archives: August 2013

PIT-Tag Antennae Go Solar

sola--panelCarrying 120 pounds of batteries once a week back and forth to our two antenna stations over the past year and a half has been tiresome. Thanks to a generous grant from the Norcross Wildlife Foundation we are able to install solar panels to keep our batteries charged. The photo shows the installation of the panels at the Shu Swamp Railroad antenna supervised by master electrician Rory Metas. The panels also help increase the likelihood that we get 100% coverage (right now we are closer to 90-95% as sometimes the batteries run down before we get a chance to change them). On Saturday we hope to have the solar panels installed at the Beaver Lake Dam station..

Bass eats one of our radiotagged trout

2013-08-15 13.10.03

This isn’t the greatest picture but what you are looking at is a 12-15 inch largemouth bass hanging out near the footbridge at Shu Swamp pond (near the railroad). What makes this guy interesting is that he is currently possessing an active radiotag (#27) I originally implanted in a brook trout we released on July 25 at the concrete bridge 600 meters upstream. This trout spent several weeks hanging around about 50 meters downstream from the dam until moving well upstream about a week ago where we detected it on August 12. Sometime in the following three days he was predated by this bass.Yesterday walked down to the pond looking for #27 and started detecting the signal. It was strongest when we pointed at this particular bass. When the bass moved the signal moved.

PIT-Tag Update

I have just completed an update of the PIT-tag releases thus far. You can download and see the results here: PIT-tagged trout data.

We have released 174 PIT-tagged trout since last summer. 65 of these have been detected at the Shu Swamp RR antenna and 10 at the Beaver Lake dam antenna. It looks like there is more dispersal when temperatures are cooler. In fact none of the 10 detected at the dam antenna were detected in summer months. So far there is no evidence of any kind of “migratory anadromous” movement as most of what we observe are detections soon after release.

We plan on releasing another 50 or 60 trout to complete the study.