I think it would be a good time to quickly weigh and measure each fish, then a take a close up photo of the last 5 inches of it's tale. Print the photo and start cataloging them all in a binder. I assume the markings on the lateral line don't change but I may be wrong.
I caught two fish one evening that I though were the same, but upon getting home and comparing the photos they were clearly different fish. I'm not a big fan if punching holes and clipping tines.