Cool! I'm hoping to get out there this weekend and catch a few.
The sulfur is a byproduct of anaerobic bacteria decomposing organic matter in deep water above Center Hill Dam. In late summer, deep water below the thermocline stratifies and cannot mix with surface water. It's too deep and far away from sunlight for plants to photosynthesize oxygen, so bacteria and other living organisms gradually consume all the oxygen in the deep water until it's gone. Once the oxygen is depleted, certain bacteria thrive in the hypoxic conditions. These bacteria decompose amino acids in decaying organic matter, creating hydrogen sulfide gas as a byproduct of their metabolic process. The oxygen in the deep water will not be restored until winter, when the surface temps get down into the 40s and the lake "turns over," once again circulating oxygen-rich surface water into the depths.
I have smelled the sulfur smell below Percy Priest Dam many times, but I have not encountered it before below Center Hill. This is another sign that the water quality above the dam is especially poor this year. Thank god for the sluice gate, because without it the water coming through the dam would probably be so low in oxygen that the trout would really be having some trouble surviving right now.
bd
Last edited by bd-; 08-03-2011 at 09:19 PM.
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