Cool ideas about attracting fish!! I never thought of that.
I guess my question is, do you exhale slowly (sporadically) while you are under, or just keep holding your breath at whatever volume you took in with you until you hit surface again.
I think this should give you at least extra 5 - 10 seconds for being a little bit more relaxed while making your way up slowly, though I read in FRC diving you even come down with empty lungs!!
Fridykning