There are a lot , it totally depends on what you want to do. What road you want to go down and where your passion lies. My passion lies in conservation, marine mammals and sharks, where as some marine biologist may focus on smaller fish or algae or shellfish.
It is entirely up to you! You will find work if you really want it
Thankyou lovely :)
I use a GoPro Hero3+ all the time :)
You can do a lot for conservation without a degree. Try volunteering at some non for profit organisations :) volunteering gets you experience, and experience gets you everywhere :)