It is amazing just to see where fish can live. Yesterday Noah and I were trying to catch spot tail shiners out of a drainage pipe discharge. The pipe and the area downstream from it was full of life. Hundreds of spot tails, some juvenile panfish, and a small bass. The bass was there to chase the shiners, and the rest were presumably there for the warm road runoff. None of these fish were large individually, but it was cool to see so much biomass in one place. Plus, they were beautiful little fish. As were the small fallfish that I found podded up in a pool further up the stream.
When it comes down to it, one of the biggest reasons I am into fishing is observing biodiversity. And the largest fish make up the smallest portion of a water bodies' total biomass. There are only a handful of fish species (comparatively) in the North East that get larger than a foot on a regular basis, which means to really see the kinds of fish around here, you have to fish the small ones. Shiners, top minnows, mummichogs, brook trout, grass pickerel... all amazing, beautiful fish that live in amazing places that I would never have seen if I didn't spend time fishing for small species.