Northern Snakehead Tagging Study:
Little Hunting Creek
Fishermen who spend time in and around the Potomac River tributaries don’t all have the same opinion about the Northern Snakehead, but rest assured, they all have an opinion. And there’s a good chance it will be a strong one. Some fall in the “they’re destroying the fishery and must be eradicated at all costs” camp, others in the “they must be protected as a sportfish before it’s too late” camp. And some, believe it or not, actually fall somewhere in between.
There are four agencies who regulate the fishery and have a great interest in gathering data on the Snakehead population: U.S. Fish and Wildlife, Maryland Department of Natural Resources, DC Fisheries and Wildlife, and the Virginia Department of Game and Inland Fisheries (VDGIF). These agencies are working together to gather data about Snakehead in the Potomac tributaries, and part of that collective effort includes doing shock surveys, tagging, logging and releasing fish back into the system. Fisheries biologists at VDGIF, led by Snakehead expert John Odenkirk, generously invited myself and David Coffman, editor of VDGIF’s Outdoor Report, to come along for one such tagging survey.
Fisheries biologist Mike Isel skillfully piloted the boat into some tight spots!
Mike also operated the generator and controlled the flow of electricity to the probes that dragged through the water. Once the generator, which supplies the juice, was turned on, Mike operated a foot pedal which distributes electricity into the water.
Jarrett Talley, Fisheries Technician, manned a net on one side of the boat, while Odenkirk worked the other side. In this photo you can see the probes in the water.
It was quite interesting to watch different species of fish react differently to the electricity. Snakehead have an air bladder that, upon shocking, expels air. So they tend to sink, giving the netters just one shot at them most of the time. Here Odenkirk quickly gets the net under a snakehead.
The fish are then brought into the boat and placed in a live well. Tags are applied later to all the fish collected before they are released. For a short video showing John Odenkirk netting a Snakehead, click here.
The snakehead are often netted with samples of the vegetation and food sources they like best. The Banded Killifish, shown here, Odenkirk says are very commonly found in the places Snakehead are captured. Is it just me, or is this Snakehead eyeing that one in Odenkirk’s hand?
Once the shocking and netting is done, the fish are removed from the live well one at a time (roughly in order of their level of cooperation) and placed on a board for measurement.
This sample is about 72 centimeters, or just over 28 inches.
Out of the ten Snakehead fish netted in this survey, two of them were ‘recaptures,’ fish that already contained a tag.
All the others received tags. Here Odenkirk tags a beauty, and the tag number is logged. Previously tagged fish are logged by tag number as well, then released with the others.
The high visibility tags contain instructions for any angler who catches a tagged Snakehead. You are requested to kill the fish, then report the location to the phone number printed on the tag.
Mike Isel logs the new tags, along with date, location and length of each fish.
Odenkirk tosses a tagged fish back into Little Hunting Creek.
The bright orange tag is visible even in murky water conditions. There are probably a few Snakehead targeted by everyone from Herons to bowhunters who would prefer that the tag were a drab olive.
Isel hits the throttle as we exit Little Hunting Creek. Next to him David Coffman, and Jarrett Talley stands up front.
I can’t thank the VDGIF’s great team on Snakehead control duty enough for letting me ‘tag along’ today. Dammit, I was going to avoid that pun, but it’s late. Forgive me.