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Blackbanded Darter, Percina nigrofasciata

Started by Michael Wolfe , Mar 23 2013 09:15 PM

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#1 Michael Wolfe

Board of Directors

North Georgia, Oconee River Drainage

Posted 23 March 2013 - 09:15 PM

Both of these fish were captured at the same location in a tributary of a tributary of the Chattahoochee a little north of Atlanta. The photos are not the greatest (particularly the out of place pectoral fin in the first one). But the real thing that is bugging me is just how different these fish look. I was under the impression that the only darter in this part of the watershed was Percina nigrofasciata. And the first fish looks like what I expect to see. But about half the darters looked more like the second fish.

I know that P. nigrofasciata is a really variable species. But even in the same same stream? Or is the second fish something else? If so, what?

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#2 Guest_Sven_*

Guests

Posted 24 March 2013 - 05:49 AM

I see that the 1. fish has a vertikal stripe in the eye too and the heads look abit different. Like the 2. one is more ground orientatet.
If it could be 2 different species a special, scientific book might help. Often a specie is only able to identify by counting fin rays. I know that from my Polypterus.

Or it´s male/female?

This might be a good site with lifepictures from local (Ohio) fishes: http://www.dnr.state...13/Default.aspx

Sven