bp acted responsibly, from a tragedy they have responded responsibly. half my family were working towards resolve. reporter: an emergency cash payment from bp kept gold band oysters afloat and more money is expected from a class-action lawsuit. and sales are down, 65%, but they are surviving. and, studies have known no oil contamination in gulf oysters. a different story for dolphins at the top of the the gulf food chain. we have literally seen over 700 dolphins and, you know, one animal may have one thing and another, we may see something completely different. scientific studies are trying to determine what exactly is harming the dolphins. but there is no debate, even from bp executives, over the cause of this damage. the marsh grasses are regenerating and you can see, it