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What Does a Marine Biologist Do on a Typical Day? (12 Examples)

Marine biology is the study of marine or sea life, and those that study marine biology are called marine biologists. If you are interested in the ocean and the things that live there, you may have considered a career in marine biology and wondered “what does a marine biologist do on a typical day?”.

The ocean is a big place, and the diversity of living things in the ocean is astounding! There are many types of life to study in the ocean, which means there are many different ways to study marine biology. So what one marine biologist does on a typical day can be very different from what another marine biologist does!

12 things a marine biologist does on a typical day

It’s hard to say what every marine biologist does on a single day because there are many specializations in marine biology. This means that every marine biologist is a little bit different!

Oftentimes, a marine biologist can wear many hats and does work in the field, work in a lab, behind a computer and interacting with the public.

This is a list of several examples of some of the tasks, duties, or responsibilities that a marine biologist may take on in a day or throughout their career.

1. Snorkel or Scuba dive

Some marine biologists need to regularly be in the “field” to do their work. For example, one way that marine biologists monitor the diversity and abundance of marine life in certain habitats (like coral reefs) is by going and counting the marine life they see while snorkeling or scuba diving.

With global climate change, we are seeing an increase in damage to coral reefs. Some marine biologists may snorkel or scuba dive to do regular checks at coral reefs to track the damage and spread of coral diseases or bleaching.

2. Use drones

With the advancement of technology and the use of UAVs (unmanned aerial vehicles) or drones, scientists have began to use drones to capture footage of coastlines, count populations of whales, seals, sharks, etc., and even monitor harmful algal blooms.

Drones can also allow for marine biologists to watch and record the behavior of marine life without needing to be in the water with them, which is bound to influence behaviors.

3. Collect data

In all branches of science, researchers need to collect data (little pieces of information) to work towards answering a question or solving a problem. This includes marine biologists too, which may spend hours taking down data and recording numbers from experiments or observations.

4. Read- a lot!

For marine biologists directly involved in research, there is a lot of reading to be done before actually beginning research.

Researchers need to first read the scientific literature that is available about their topic of interest before coming up with a question to explore. This helps scientists design their study and come up with hypotheses (educated guesses) pertaining to their research.

5. Collect samples

Marine biologists collect samples to help answer their questions. For example, scientists interested in how water temperature or salinity (how salty the water is) affect certain marine life will need to regularly collect water samples to monitor the water.

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This is only one example from the types of samples that marine biologists may collect, they may also collect blood or tissue from living or dead animals.

6. Laboratory work

Not all marine biologists work in the field. In fact, a lot of marine biologists work in laboratory settings. Laboratory work can look like testing water samples, extracting DNA from tissue samples, and analyzing hormone levels in blood samples to name a few.

7. Go fishing

Probably one of the more fun duties for some marine biologists is fishing! Some marine biologists study large fish or sharks, which they need to capture in order to attach transmitters to that are used to track the movements of animals.

This means that some marine biologists may spend hours or days out on the water fishing for new study animals.

8. Analyze data

After data is collected, marine biologists need to analyze the data. This requires a working knowledge of statistics to analyze and understand data to apply to their research question.

A lot of statistical analysis these days is done using coding in special software designed to analyze data.

9. Sit, wait and watch

Some marine biologists are focused solely on understanding the behavior of certain marine animals. It can be difficult to observe animal behavior in the wild. So, many times marine biologists will observe and study captive marine animals at zoos or aquariums.

Observing animal behavior requires researchers to sit, wait, watch and record an animals’ every move.

10. Community outreach

Community outreach (speaking to the public) and education is really important for marine biologists because it can help the public to understand the importance of science and the value of studying marine life.

Most of our ocean’s wildlife is in danger due to climate change, overfishing, and pollution. So getting the public on board about the importance of conserving our oceans is more important than ever.

11. Write

Those conducting research, collecting and analyzing data will ultimately need to put their findings into writing. Publishing scientific papers on the results of research is important because it allows for scientists to contribute their knowledge and findings to the large body of ever growing research that allows for us to better understand marine life.

12. Collaborate with local fishermen

Because many marine biologists study fish, they may need to work with or collaborate with those that work with fish in a different capacity, like fishermen. Fishermen can be a great resource for understanding fishing trends. Like whether or not they are catching more or less of a particular species than they normally do.

This sort of information is incredibly useful for marine biologists wanting to study population dynamics of fish that are traditionally targeted in commercial fisheries.


Many people think that marine biologists spend all day every day in the water swimming with exotic fish or playing with dolphins, but that is very rarely the case. The career prospects for marine biologists are as diverse as the organisms found in the sea.

In reality, much of a marine biologists job is doing less than glamorous tasks. Nonetheless, working to understand marine life is a worthy venture. Those that decide to pursue a career in marine biology are sure to be fulfilled in knowing that they help to contribute to a greater understanding of the world.

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Samantha Smith B.S.

About Samantha Smith B.S.

Samantha is a wildlife biologist with degrees in animal behavior and environmental biology. Most of her work has been with reptiles, however she has also worked with birds and marine organisms as well. She enjoys hiking, snorkeling, and looking for wildlife.