Love the question Snipe. FWIW, I do think that exceeding the carrying capacity by stocking additional adult LMB will cause mortality. The standing weight of LMB will rebalance to the weight that the production of consumed foods can support. This could kill fish ... especially the larger ones. I guess, what I don't understand is why the client's fish died when in good body condition. Esshup's suggestion of water quality parameters seems to be a very good place to start.

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers