I commonly use my hand to measure fish for a quick and dirty measurement. So the width of three fingers is about 2.5" for me. Just glancing at the photo, I might estimate the smaller fish at 3". Interesting how the smaller 1"-2" fish are in the pickerelweed. Makes perfect sense that they need the cover as protection against predation.

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers