Not to split hairs or anything but I don't know of any permits that allow you to go on someones property (unless you mean writ/warrant).
In most cases a fishing license is all you need but in some cases you have targets for some reason (in my case photos). I might be asked to photo some fish that is abundant in TN then travel to KY for a few other similar species nearby to then travel to IL for comparative photos. Each state would have different laws regarding what is used to sample and permits help the entire process.
So no...you don't need permits in most cases to take pictures but it can help.
My best guess it that they are both bandfin darters (Etheostoma zonistium). I feel pretty comfortable about the first picture. The second I feel more iffy about.
Sandtiger is right! and I'm bad for implying they were not the same species.
kafiltafiisch deserves credit for recognizing them as the same species as well.
This photo couplet shows a male and a female bandfin darter (photo taken from the same stream on the same day).
Needless to say, the brightly colored male will not stay this way all year nor will the female. While color is obviously important on the male fish you'll not have these cues to help you in the heat of summer but to some degree will be present.
We've recently had lots of ID threads centered around color and this is an example of how different colors can be on the very same species of different sex.
Sandtiger is right! and I'm bad for implying they were not the same species.
kafiltafiisch deserves credit for recognizing them as the same species as well.
I don't think that's bad, if anyone of us were to collect those two fish from a creek we wouldn't know they were the same species, unless we caught them in the act perhaps.
We've recently had lots of ID threads centered around color and this is an example of how different colors can be on the very same species of different sex.
I thought that's the angle you may have been playing. Though I honestly wasn't just guessing on the female. I actually noticed the similarity between the females before that of the males.