You are on a research vessel at dawn, lowering a plankton net into water that shifts from blue to green as the depth changes beneath you. What lives here, how many, and why it is changing are the questions your work is built around. Marine biology is a real career with a defined path, though entry is competitive and rewards people who plan ahead.
Most marine biologists start with a bachelor’s degree and add field experience as early as they can. At Unity Environmental University, the Bachelor of Science in Marine Biology and Sustainable Aquaculture is a remote bachelor’s degree designed for the life you’re already living, whether you’re starting college or changing careers.
Before you commit to the path, it helps to know what the work involves, where it happens, which education requirements and steps get you in, and how careers and pay progress from there.
What Does a Marine Biologist Do?
Marine biologists study ocean organisms, ecosystems, and the processes that govern marine life from the molecular to the ecosystem level. The work is field-intensive, analytically demanding, and increasingly applied to conservation and resource management.
Most weeks mix time on the boat, in the lab, and at the desk. A marine biologist might:
- Conduct underwater surveys to assess reef fish populations
- Collect and preserve water samples for nutrient analysis
- Analyze hydroacoustic data to estimate fish biomass
- Write a section of a stock assessment report, then present findings at an agency review
- Maintain field equipment and manage biological specimen collections
- Contribute to environmental impact assessments for coastal development projects
- Support public education and outreach programs
The work is more technical and data-driven than popular media suggests. Species identification, statistical analysis, scientific writing, and data management are professional baseline skills.
Field time is real and rewarding. So is the time spent processing samples, cleaning datasets, and writing the reports that translate field observations into management decisions. More of that data now comes from autonomous vehicles, acoustic sensors, and environmental DNA sampling, which is steadily reshaping the daily work.
Where Do Marine Biologists Work?
Marine biologists work for government agencies, research institutions, private firms, and nonprofits, in the U.S. and abroad.
Federal agencies are major employers. NOAA Fisheries hires marine biologists for stock assessment, protected-species research, and habitat management at regional science centers on both coasts, in the Gulf of Mexico, and in Hawaii. The U.S. Fish and Wildlife Service has specialists in marine and coastal species, and the EPA and Army Corps of Engineers need biologists for environmental review and permitting that affect marine and coastal systems.
State fish and wildlife agencies and marine fisheries departments hire biologists, including fisheries biologists, for research and management roles. Aquariums, marine research institutions, and universities need marine biologists for research, teaching, and collections work, while environmental consulting firms hire them for baseline surveys, impact assessments, and mitigation monitoring. Conservation nonprofits such as the Ocean Conservancy and Marine Conservation Institute employ both biologists and marine conservationists in science and advocacy roles.
Steps to Become a Marine Biologist
Marine biology careers reward field experience, species knowledge, and quantitative skills alongside academic credentials. Entry-level jobs are competitive, so the candidates who stand out usually start on all three well before graduation.
1. Complete Your Education
The core requirement for marine biology education is a bachelor’s degree, which typically takes about four years. Marine biology is the most direct major, but biology, zoology, and other closely related fields also lead into the work. Expect coursework in marine ecology, oceanography, chemistry, and statistics, since the field depends on data analysis as much as species knowledge. A master’s degree is often needed for higher-level positions, and leading independent research typically requires a PhD.
2. Gain Field Experience
Pursue research technician and field assistant positions as early as possible. NOAA, state marine fisheries agencies, and marine research institutions all post seasonal and term positions. The National Sea Grant College Program is especially useful. It has university-based programs in every coastal and Great Lakes state, and many of them offer paid undergraduate internships that connect students with research projects and the people who hire for federal and academic jobs.
If you’re studying remotely, look for this experience close to home, where state agencies, aquariums, and watershed monitoring groups take on seasonal staff and volunteers. Apply broadly and early; competitive positions fill fast.
3. Build Relevant Skills
Marine biologists need skills in data analysis, geographic information systems (GIS), scientific diving, and field sampling techniques. Communication matters just as much, because research teams depend on clear reports of what you found in the field.
4. Earn Certifications
Earn SCUBA certification if your career goals involve fieldwork in subtidal environments. Recreational certifications such as PADI Open Water and Advanced Open Water are the usual starting point for research diving, and many marine biology field positions list them as required or preferred.
Scientific diving programs build on that entry-level certification with their own training, usually following American Academy of Underwater Sciences (AAUS) standards.
5. Join an Organization
Join the American Elasmobranch Society, Society for Marine Mammalogy, American Fisheries Society, or the relevant professional organization for your target species group. Student memberships are affordable and provide access to job boards, professional development resources, and the networks that connect job seekers to research groups and agency hiring managers.
Marine Biologist Career Trajectory
Most marine biology careers move through five stages, and each one adds more independence and responsibility:
- Research Technician or Field Assistant: You collect samples, process specimens, maintain equipment, and support senior researchers, building the field skills all later work depends on.
- Marine Biologist I: You take independent responsibility for specific research tasks or monitoring programs.
- Marine Biologist II or Research Scientist: You lead projects, analyze data, and begin contributing to publications.
- Senior Marine Biologist: After years of field and analytical work, you take lead scientific responsibility for a research program or species assessment.
- Program Manager or Principal Scientist: You provide full scientific and administrative leadership.
Graduate education is increasingly expected at the top two levels and is often required for federal research scientist positions. Not everyone climbs this ladder, though: aquaculture, consulting, and education open up marine biology careers well beyond research.
Marine Biologist Salary and Job Outlook
Pay depends heavily on where you work. According to the U.S. Bureau of Labor Statistics (BLS), zoologists and wildlife biologists, the occupation group that includes marine biologists, earned a median annual wage of $76,780 in May 2025. The lowest 10% earned less than $49,100, and the highest 10% earned more than $126,440. Consulting and research roles tend to pay the most and nonprofits the least, while biological technicians, a common first title, earned a median of $57,510.
Job Outlook: BLS projects 4% employment growth for the occupation from 2025 to 2035, about as fast as average, with roughly 1,400 openings a year. Most of those openings come from retirements or career changes, and because government agencies fund so much of the field, budgets can limit hiring.
Start Your Path to Marine Biology at Unity Environmental University
Whichever corner of the ocean pulls you in, the first credential is the same, and you don’t need to live on the coast to start earning it.
Unity’s BS in Marine Biology and Sustainable Aquaculture covers that first credential in 120 credits of remote learning, built for working adults and career changers. Courses such as Introduction to Oceanography, Marine Mammal and Seabird Biology, Ichthyology and Fish Health, and Field Research in Marine Biology and Aquaculture develop the species knowledge, ecosystem literacy, and research skills entry-level employers look for. You can transfer in up to 90 credits, start in any of eight terms a year, and keep your tuition rate locked through 2030.
Request information about the program, and we’ll help you plan your first term and see how your credits transfer.
What Students Say
“What really stood out to me was the environmental aspect of it. Growing up in Arizona I wasn’t able to study marine biology, but Unity has allowed me to!”
Jacqueline F., BS in Marine Biology and Sustainable Aquaculture
Ready to Take the Next Step?
Unity Distance Education’s BS in Marine Biology and Sustainable Aquaculture is a fully online, 120-credit program designed for working adults. It builds the oceanography, marine ecology, species biology, field research, and aquaculture skills that marine biology careers are built on. With up to 8 start dates per year, you can begin when your schedule allows.
Questions About Becoming a Marine Biologist
How Long Does It Take to Become a Marine Biologist?
Becoming a marine biologist typically takes about four years (generally the time required to earn a bachelor’s degree). Building field experience through internships or research while you study can shorten the time to your first job. For advanced research or specialized roles, a master’s or doctoral degree can add 2 to 6 more years.
Do I Need a Master’s Degree to Become a Marine Biologist?
A master’s degree isn’t usually required for entry-level positions, but it can open doors to more specialized, higher-paying, or research-focused roles. Many marine biologists pursue a master’s degree to build their skills and move into more advanced roles.
Can I Become a Marine Biologist With an Online Degree?
Yes. Unity’s BS in Marine Biology and Sustainable Aquaculture, offered through remote learning, provides the academic foundation employers look for in marine biology candidates. The best complement to a remote degree is field experience, which you can build through internships, seasonal positions, and volunteer work alongside your coursework.
Salary data sourced from the U.S. Bureau of Labor Statistics Occupational Outlook Handbook (May 2025 wage data). Unity Environmental University cannot guarantee employment or specific salary outcomes.
