My amature guess is that it is too early (and probably too cold) to make any judgement calls. Fish can live through some amazing stuff. Perhaps one of the pond experts like, say Theo for instance, can provide their thoughts here.

JHAP
~~~~~~~~~~
"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)