ORIGINAL: nw/jigmaster
Have seen millions of these fish die .. year after year @ pymie.. Usually after first ice..Was there 1 year with about 1 inch of black ice.. they were still dying under the clear ice.. flopping and twitching to death.. Yet they come back year after year.. Maybe once establised always established..
One can see them starting to die off in September . I think it's related to fall turnover . Not to insult anyones' intelligence , that is when the bottom water "turns over " and mixes with the top water . The thermocline is generally around 15 - 20 feet and anyone that has experienced it knows how cold the water is . That would make sense because turnover typically happens in PA in late September . Just my thoughts on them dying off .