I have seen many posts that desribe either maintaining an area of open water or shovelling an area clear of snow in the winter in order to allow plankton to grow/survive. What I am wondering is how cold the water can be and still have plankton grow/survive? I had a great green pond all summer until the water dropped to around 46 degrees a few weeks ago, then it went brown and died. Or at least the 'bloom' died. Now my water is terribly clear. Is it just that I am unlikely to get a bloom in the winter but I can still expect at least some plankton growth? (The other problem with my now clear water is predators have had easy pickings)
Thanks.

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