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Message: [QUOTE="MitchM, post: 293596, member: 4402"] Here's the thing with the thermocline stuff - Thermocline, epilimnion, metalimnion, hypolimnion, stratification are all terms that deal with how water at different temperatures behaves. Add in geographical differences, weather differences and throw in some man made aeration with some fish kills for drama and for me it's a lot of work to pinpoint how and why something changed. I'm not comfortable trying to identify the correct terminology for what is happening in my pond regarding water density and temperature. I'm happy just observing for now. I'm more interested in somehow monitoring the oxygen level, because that's what is more important, imo. I'm just now comfortable with the math around pond heat loss. Stir up some bottom layer detritus, mix it with some cold low oxygen water, have some fish that will be sluggish because of the cold water and you have the conditions for a fish kill. . [/QUOTE]