Well, seeing as the whole earth was flooded, he didn't have to save any, but if the whole earth dried up and he was told to build a huge tank then he should save Yellowtail tuna, because it's yummy!
i say it would be salt because the most likely "noah scenario" would come about by polar ice caps melting, thus making the oceans rise to an ungodly level
this would be a total catastrophe because every lfs would be underwater
what to do on weekends? what would we spend our tax returns on? would life become like -*GASP*- the movie Waterworld? Maybe fish would keep us in oxygen tanks