I think you will have a problem: Ichthyology is a class, not a career and you will have to take depends on what the major you want. For example: Aquatic Biology, Wildlife Management, Marine Biology, Aquaculture etc...Then there's a different kinds of degree such as A.A, Bachelor's and Master's degree. Don't take A.A degree because you are less likely to be hired for your job with that degree. You do have better chances to being hired if you have a bachelor's or master's degree.