I believe those tags are used in such a way that they are clipped on a fish's gill flap, I don't think they are any less invasive to them, and I believe that they are more prone to infection than floy tags.

If you need to ID fish that are small, and don't need to track individual fish, I would fin clip them. I've done that to small fish and not seen any adverse affects when I've had to track a certain stocked "class" of fish.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).