Don't listen to these guys. Major in what you want to major in and go for the job you want to go for. Jesus guys..... Worse thing that happens here is he gets a degree in marine biology.
Start here.
http://marinebio.org/marinebio/careers/us-schools/
Then decide how far you want to travel. pick a few schools, take a look at their acceptance rates, then once you've picked a few schools look at how big their Marie bio programs are. You can get a good idea of this by seeing how many different concentrations they offer with the degree. Example, I'm equal distance from utep and Nmsu. But Nmsu offers 4 or 5 different concentrations with their physics degree. Utep only offers two. So... I decided to go with Nmsu because their program was a little bigger. Hope this helps.