Hello Spongers, I am trying to find any references relating to sponge metabolism, in particular if they excrete Urea or Ammonia. I have found energetics papers based on oxygen consumption but not on protein and nitrogen metabolism. Thank you very much for your time Jade Jade Berman Marine Biologist Rothera Research Station C/O British Antarctic Survey Port Stanley Falkland Islands F1QQ 1ZZ S.Atlantic