This sampling was done in an unnamed (I believe) tributary of the Cuyahoga River near Macedonia, OH in the Cuyahoga Valley National Park. It is legal to fish in this area, though I still need to check to see if it is legal to collect small fish from the creeks. Game fish are legal to take but there is a prohibition on the possession of minnows that will likely put the kibosh on taking darters and dace.
I primarily used a large dipnet, though in a couple of spots I tried a small seine with mixed results. The creek bed is approximately 30 feet wide, though at the moment the water itself varies in width from 3-20'. It varies in depth from 3-20" with pools that can be much deeper downstream of fallen logs (more than 6' deep in one case.) The bed is sand, gravel, and cobbles with very few large stones. This collection was done today, June 9, at 10 AM. I searched over a 100 yard stretch of creek and netted approximately 100 fish over the course of two hours. It was 85 degrees and sunny.

I threw together a photo tank out of scraps of acrylic and silicone that I had on hand. I know that the two don't really mix, but I figured that a 5" deep container should hold together. It lasted through about 5 fish then basically fell apart. Thus the first few pictures are pretty good and later pictures were of iffy quality and most were not worth posting.
The very first thing I did was step into some very deep sand/mud mixture and sink up to my knees. Apparently this was sufficiently funny to convince a male western blacknose dace to catch himself in my seine while I floundered nearby. I'm not sure who was more surprised that he ended up in the net. This is also about the least blacknosed blacknose dace ever...

I caught a number of these fish in the time I spent looking. Some of the females had extremely faint black lines like the male above, others were more typically marked as below.

I caught a number of rainbow darters on this trip (12 or so.) I don't know whether they were all female or if some were male but had entirely lost their mating coloration, but they were all about as colorful as the one shown below. I was under the impression that male rainbow darters were relatively easily distinguished from the females even out of season, is this correct?

I caught several other darters as well that I didn't positively ID as rainbows. I don't have any pictures worth sharing (or even worth eating up space on my hard drive) and was unable to identify them for certain. I believe at least one was a johnny darter, which I was a bit surprised by based on the type of water I caught it in, but it was pale and very snub nosed.
Finally, I caught large numbers of the fish pictured below. I'm not certain what they are, and unfortunately I didn't catch any before my photo tank suicided. They are handsome little critters, 2" long. They look like they could be the young for a number of larger fish, but I can't figure out what the heck they actually are. I'm intending to post in the ID subforum for help on this, but here is a picture.

Edited by jasonpatterson, 09 June 2011 - 08:04 PM.