I was surprised to learn that The University of Alabama has a fine school for Marine Biology. I have a niece there who has earned her Masters in the discipline and is now working on her doctorate . . . They have many program that utilize their proximity to the Gulf of Mexico for classes and programs . . . one such on Dauphin Island . . .
One of such schools is Cornell University in New York. There are many other schools offering this program. Degrees in marine biology are often earned at the master's level, where a Bachelor's degree either in Biology, Zoology or another life science is required. marinebio.org/marinebio/careers/us-schools.asp has a list of schools offering the program.