My dad made his dock pillars by taking a hog panel (cattle panel), rolling it into a circle, then filling them with rocks. This makes a vertical pillar of rocks. Can ALWAYS catch as many perch next to those as you want. Invertebrates can also be seen crawling in and on the rocks. (also a great place to find snakes). The habitat and life those pillars makes is impressive.

19 acre watershed pond
LMB, BC/WC, Bluegill, Crawfish, GShiners