A low productivity system, will not sustain heavy fishing pressure. Huge diversity of non-game species.
Some observations are useful in understanding warm-water fisheries.
Three fish-less ponds were stocked with differing numbers of bluegill fry in late spring. When more crowded, the fish will simply be smaller. These small, slow-growing fish retain the ability to resume growth if the crowding is alleviated, as by moving some to a less crowded pond. A recreation area in Illinois contained a 2 acre pond. The recreation area was used for family and group picnics and many would bring fishing gear along.