How to become a marine biologist

1. 1Take biology, chemistry and math in high school

   Time: 4 years (high school)Sources 1

   Marine biology is built on biology, chemistry, physics and a lot of statistics, so take the most advanced science and math courses your school offers. Swimming well and getting comfortable on boats helps, and volunteering at an aquarium, nature center or beach monitoring program gives you an early sense of whether you like the work. Some students earn recreational scuba certification, though it is not required to start a degree.

2. 2Earn a bachelor's degree in a biological science

   Time: 4 yearsCost: $49,136-$52,616 in public tuitionSources 2, 3

   Major in biology, marine biology, marine science, zoology or fisheries. Plan your courses around jobs you might want: nonresearch federal fish biology positions (series 0482) require a biological science major with at least 6 semester hours in aquatic subjects such as ichthyology, limnology or oceanography and 12 semester hours in animal sciences. Take statistics, chemistry and a programming or data course. A semester or summer at a marine field station adds hands-on sampling experience.

3. 3Get field experience during and after college

   Time: 1-3 years (overlaps with school)Sources 1

   Field experience is often what separates applicants. Look for paid summer technician jobs with state fish and wildlife agencies, NOAA-funded surveys, university labs and consulting firms, as well as research experience programs for undergraduates. Many graduates spend a year or two in seasonal or contract jobs, collecting data on boats and in labs, before applying to graduate school or permanent roles. Keep a record of the gear, species and software you have used.

4. 4Add diving or boat qualifications if your work needs them

   Time: Weeks to a semesterCost: VariesSources 4

   Underwater survey jobs require scientific diver authorization, which you get through a university or agency that is an organizational member of the American Academy of Underwater Sciences. Its standard calls for a 100-hour training course that includes 12 dives, and you usually need to be affiliated with the organization for insurance reasons. Boat handling, small-boat safety and first aid courses are also common job requirements.

5. 5Complete a master's degree for permanent roles

   Time: About 2 yearsCost: Varies widely by programSources 1

   BLS notes that zoologists and wildlife biologists typically need at least a master's degree for higher-level jobs. A thesis-based master's lets you run your own field project, build statistical and writing skills and publish. Choose an advisor whose research matches the work you want, and ask programs whether students are funded through research or teaching assistantships before you commit.

6. 6Earn a Ph.D. to lead research

   Time: About 4-6 more yearsCost: Varies by programSources 1

   Independent research positions, such as university faculty or principal investigator roles at federal science centers, typically require a doctorate. A Ph.D. means designing and funding your own research, publishing several papers and often completing postdoctoral work afterward. Most agency, consulting and nonprofit jobs do not require a Ph.D., so weigh the extra years against the jobs you actually want.

Programs, tuition and graduates’ earnings

U.S. Department of Education, College Scorecard (most recent cohorts, released 2026-10-15). Scorecard groups programs by 4-digit field, so a row can include related programs. Tuition is the median published undergraduate tuition and fees of the colleges offering the program (shown only for undergraduate credentials); debt is the median of programs’ median federal loan debt at completion; earnings are the national median for the field and credential four years after completion.

Requirements differ by state. Check your state’s rules in the CareerOneStop License Finder (U.S. Department of Labor) before you enroll.

Statistics and data analysis

Population estimates, stock assessments and survey trends all come from statistical models, and most hiring managers ask about R or similar tools.

Species identification

Survey data are only useful if fish, invertebrates and plankton are identified correctly, often quickly on a moving deck.

Comfort on boats and in water

Field days can mean rough seas, cold water, heavy gear and long hours, and seasickness or weak swimming limits what you can do.

Scientific writing

Reports, permit reviews, grant proposals and journal papers are how your fieldwork turns into management decisions and funding.

Careful field procedures

Samples must be labeled, preserved and logged the same way every time, or a whole season of data can be thrown out.

O*NET 31.0 rates these skills as most important for the occupation: reading comprehension, active listening, writing, speaking, science.

Training cost

$49.1K–$52.6K

Before financial aid

Time

6-7 years

Typical path

Median pay

$76,780

All US jobs: $50,980

Payback once qualified

1.9–2.0 yrs

Pay above the all-jobs median vs. cost

Bachelor's degree only: 4 years at the Scorecard median public in-state tuition for zoology/animal biology ($12,284 a year = $49,136) to marine sciences ($13,154 a year = $52,616). Not included: housing, field courses or semesters at marine stations, dive training, and graduate school, whose cost varies widely by program and funding.

Rough guide only: ignores taxes, aid, interest and earnings given up during training. How we calculate it.

• Fisheries or marine program manager

  Experienced biologists at state and federal agencies move into managing survey programs, staff and budgets; a master's degree and years of field leadership are usually expected.

• College professor$82,250 median

  Teaching and running a research lab at a university requires a Ph.D., usually followed by postdoctoral research and a record of publications and grants.

• Data scientist$120,230 median

  Marine biologists with strong statistics and programming skills can move into data science roles, often adding machine learning and database skills through coursework or projects.

• Veterinarian$130,100 median

  Those drawn to animal health in aquariums or marine mammal rescue can apply to veterinary school, which takes a four-year DVM and a state license.