Firstly, marine biology is salt water / ocean stuff. Freshwater stuff is limnology and often aquatic biology topics. A degree in fisheries can be either marine or freshwater oriented.
If you do this education on line you will miss out on a lot of neccessary laboratory interaction and many field studies. In my opinion, science degrees are not well suited for on-line studies. I would never hire a biologist with an online degree.
Most biologists do not make a lot of money at least right out of school. The ones that make the most money have been graduated a long time and usually work in unrelated fields. Long term biologists in the field have to love the job to be happy because most are not getting rich, unless you call happy at work rich.
Newly graduated Pharmacists and engineers who are competitive and knowledgable are often starting at salaries of $50K-60K+. Currently there is a shortage of pharmacists.
Good Luck.
