the cause of the blue glow is bioluminescence: light produced by a chemical reaction which originates in an organism, and this case, it was an organism that lived in the lake for one summer only!
the whole, fascinating story is on his website, but i'll summarize here. fires and massive floods starting in 2006 caused nitrogen rich water with high salinity to concentrate in the gippsland lakes. after a summer of these conditions, a new species to the lake began to prosper, called noctiluca scintillans, or sea sparkle. whenever there is motion or agitation in the water, it glows more brightly!
what a strange and interesting world we live in!
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