I think the water clarity statement is a generalization gone bad. Many if not most fish are sight feeders. If you have muddy, turbid or algae tainted waters it makes it hard for them to feed, stresses them and you have even a worse situation than crystal clear. It also can affect thier gills, cause oxygen depletion by reducing normal aquatic plant photosynthesis. My ideal pond, the best I manage is on the clear side. But it has the best zooplankton bloom I have ever seen. I think overall fertility and the proper food chain from the bottom up will be there even if water is clear. It may not be if the water is murky. Just my two cents on clarity.
