I am about 3 or 4 semesters away from graduating with B.S. in biology and minors in limnology and chemistry. I plan on going to UMD for a masters right away. I am planning on working as a fisheries biologist, I found that a biology degree was the best choice for me. Biology lets you focus on your area of interest due to the huge number of topics covered. I am not sure what exactly is covered under enviromental science, but you may want to look at getting a major in biology and a minor in enviromental studies, ecology, fiseries managment or icthyology. Outside of the public sector there isn't a ton of work for fisheries biologists. Make sure you take the right classes and get the right minors. There are only about a billion biologist graduating each year, you need to do the course work to set yourself apart.