So far, so good. Fisheries biologists from the Illinois Department of Natural Resources are several weeks into electrofishing surveys in the Chicago Area Waterways System, and according to department spokesman Chris McCloud they have not found any Asian carp.
That’s good news, but they aren’t finished. This week they surveyed the Calumet River, one of the areas of concern for folks who are worried that the ecosystem-devastating carp will eventually establish breeding populations in Lake Michigan and ultimately all the Great Lakes.
In an electrofishing survey, biologists and fish techies zap the water with a DC current that stuns all the fish below. The fish bob to the surface, where they’re counted, and within a few minutes most of them swim away unharmed. The technique is favored by biologists because if it’s in there, it’s coming up.
McCloud told me on Wednesday that the teams had found plenty of common carp but no bigheads or silvers. This week they surveyed two areas near the mouth of the Calumet River and a section of Lake Calumet.
The first Calumet River site, right near the mouth, produced a handful of panfish and several hundred juvenile yellow perch. At the second site, a but further upstream, they found banded killifish, yellow perch and one spottail shiner. The third site, in Lake Calumet, yielded 47 common carp, 18 bigmouth buffalo, a few panfish and some minnow types.
But no Asian carp.