Best Answer
You are good to observe the phenomenon. water creature are very alert, I would guess that your shadow arouse their movement.But since you said it is unlikely some animals there, is it possible your shadow stop the photosynthesis and ....
another guess is your shadow cause the temperature unbalance in water/sludge so the sludge emitt gas ... me
Other Answers (2)
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When your shadow passes over the water small creatures you can not see that are in the bottom soil are
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Startled and move and when they do they let off the little pocket of gas that they had produced when eating the bottom soil
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Not a fart either a little smile in finishing
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It sounds as if you are being stalked by the Boggy Creek Monster! Look out!!
