Somewhere in the open ocean tonight, a robotic float is climbing toward the surface from 2,000 meters down, recording temperature and salinity the whole way. At the top it hands its readings to a satellite, sinks again, and starts over. Thousands of these floats are making the same trip right now, and almost no one who relies on their numbers, from fisheries forecasters to coral reef managers, will ever see one up close.
Marine biology runs on that kind of quiet, steady measurement far more than the documentaries let on. The tools marine biologists use fall into two groups: instruments that collect ocean data, such as profiling floats, satellites, acoustic recorders, and environmental DNA (eDNA) samplers, and analysis tools, such as statistical software and geographic information systems (GIS), that turn those readings into decisions. The U.S. Bureau of Labor Statistics (BLS) notes that zoologists and wildlife biologists, the occupation that includes marine biologists, use GIS and modeling software to estimate populations, track animal movement, and forecast the spread of invasive species.
At Unity Environmental University, the Bachelor of Science in Marine Biology and Sustainable Aquaculture builds the scientific grounding behind that toolkit, from oceanography and fish health to a dedicated field research course, through remote learning designed for the life you’re already living. What follows is a working tour of the tools, what each one measures, and four places where ocean data is already changing how the sea is managed.
Marine Biology Tools at a Glance
No single instrument tells the whole story. Most projects combine several of these and reconcile what each one sees.
| Tool | What It Measures | Who Relies on It Most |
|---|---|---|
| Argo profiling floats | Temperature and salinity from the surface to 2,000 meters | Ocean, climate, and fisheries scientists |
| Satellite sea surface temperature | Ocean heat across the globe, updated daily | Coral reef managers |
| Passive acoustic recorders | Whale calls and other ocean sound, day and night | Protected species biologists |
| Active acoustics (echosounders) | Fish schools, plankton layers, and seafloor shape | Fisheries survey scientists |
| Environmental DNA (eDNA) sampling | Genetic traces revealing which species are present | Biodiversity, fisheries, and invasive species biologists |
| Fishery surveys and landings records | Catch, size, age, and abundance | Stock assessment scientists |
| GIS and statistical software | Spatial patterns, trends, and population models | Nearly every marine science role |
What Tools Do Marine Biologists Use?
The short answer is whatever lets them measure something they cannot watch directly. Most of the ocean is dark, cold, and far from shore, so the modern toolkit is built around instruments that stay out longer, go deeper, or listen better than a researcher on a boat ever could.
Tools That Collect Ocean Data
Profiling floats are the workhorses of the open ocean. NOAA’s Atlantic Oceanographic and Meteorological Laboratory reports that the international Argo array produces about 100,000 temperature and salinity profiles every year and has delivered more than two million since the program began, giving scientists a running record of conditions no ship schedule could match.
Sound does the work where light cannot. NOAA Fisheries separates its acoustic tools into two kinds: active acoustics, which send out pulses and read the echoes to map fish and the seafloor, and passive acoustic monitoring, which simply listens. Passive recorders have tracked endangered North Atlantic right whales since 2004, detecting calls around the clock in conditions where aerial and vessel surveys are impractical.
Environmental DNA is the newest tool in common use. Every animal sheds cells into the water, and a filtered seawater sample can reveal which species passed through. NOAA’s Northeast Fisheries Science Center now collects eDNA alongside its acoustic deployments in offshore wind areas so the two methods can confirm each other.
Tools That Turn Data Into Answers
A float or hydrophone only produces numbers. Turning them into a catch limit, a closure, or a bleaching alert takes statistics, spatial analysis, and clear writing. The BLS points out that students in this field may need mathematics and statistics coursework to learn data analysis, and that writing reports and presenting findings to policymakers and the public is a standard part of the job. In practice, the person who runs the analysis is usually the one who has to explain it.
4 Ways Marine Biologists Use Data to Protect the Ocean
Each example here is an active federal program, chosen because it shows a direct line from raw measurement to a management decision.
1. Setting Sustainable Catch Limits
NOAA Fisheries manages 522 fish stocks and stock complexes under 45 fishery management plans, and in fiscal year 2024 it completed 180 stock assessments to check their health. Those assessments combine landings records, scientific surveys, and biological studies to estimate how many fish a population can lose to harvest without declining. At the end of 2024, 23 stocks were on the overfishing list and 42 on the overfished list, and each of those designations triggers a management response built on the same data.
2. Warning Reef Managers Before Corals Bleach
NOAA’s Coral Reef Watch turns daily satellite temperature readings into a single number called Degree Heating Weeks, a running total of the heat a reef has absorbed over the past 12 weeks. According to NOAA, significant bleaching usually begins around 4 °C-weeks, and widespread bleaching with significant mortality becomes likely by 8. Reef managers use the product to trigger bleaching response plans, so a satellite reading can set a field crew in motion weeks before damage is visible underwater.
3. Tracking Endangered Whales by Sound
For a species that spends most of its life underwater, hearing it is easier than seeing it. Acoustic detections of North Atlantic right whales help NOAA Fisheries understand where the whales are and when, and they feed the distribution models used to reduce collisions and entanglements. Pairing recorders with eDNA sampling adds a second, independent line of evidence about which animals are present.
4. Managing Protected Areas the Size of a Continent
In January 2025, NOAA designated Papahānaumokuākea National Marine Sanctuary in the Northwestern Hawaiian Islands, a 582,570-square-mile area that is the largest in the National Marine Sanctuary System. Protecting a space roughly twice the size of Texas depends on remote observation, spatial analysis, and long-term monitoring far more than on patrol boats. Internationally, the UN Decade of Ocean Science for Sustainable Development, running from 2021 to 2030, gives governments and research institutions a shared framework for producing exactly this kind of decision-ready ocean science.
Which Data Skills Do Marine Biologists Need?
The instruments change every few years. The skills underneath them change much more slowly, and they are what employers screen for:
- Statistics. Population estimates, trend detection, and uncertainty ranges all rest on it, and it is the skill most career changers underestimate.
- GIS and spatial analysis. Habitat maps, protected-area boundaries, and animal tracks only make sense in space.
- Sampling design. Good conclusions depend on deciding where, when, and how often to measure before the boat leaves the dock.
- Data management and quality control. Raw sensor output is messy, and cleaning it is a large share of the real work.
- Scientific writing. Findings that never reach a manager or a regulator rarely change anything.
For the full set of field and laboratory skills the career requires, Unity’s guide on how to become a marine biologist covers the broader picture. If the analysis side is what draws you most, the path toward becoming a marine data analyst is built around these exact skills.
Where Data-Driven Marine Biology Leads
The BLS reports a median annual wage of $76,780 for zoologists and wildlife biologists in May 2025, with 4% projected growth from 2025 to 2035 and about 1,400 openings a year. Government employs about two-thirds of the occupation, but the private sector pays well for analytical skill:
| Employer Type | Median Annual Wage, May 2025 |
|---|---|
| Management, scientific, and technical consulting services | $84,570 |
| Research and development in the physical, engineering, and life sciences | $84,110 |
| Government | $78,650 |
| Social advocacy organizations | $56,700 |
Entry-level roles typically require a bachelor’s degree, according to the BLS, while higher-level positions tend to call for a master’s and leading independent research usually takes a Ph.D.
How Unity’s B.S. in Marine Biology and Sustainable Aquaculture Builds the Foundation
Every tool in this field assumes you understand the system it is measuring. The program core in Unity’s BS in Marine Biology and Sustainable Aquaculture is where that understanding gets built:
- MBAQ 105 Introduction to Oceanography. Surveys the chemical, biological, geological, and physical patterns of the world’s oceans, the context every float and satellite reading sits inside.
- MBAQ 310 Marine Mammal and Seabird Biology. Covers identification, population biology, behavior, and ecology, the questions acoustic and eDNA surveys are designed to answer.
- MBAQ 307 Ichthyology and Fish Health. Grounds the fish biology that stock assessments depend on.
- MBAQ 315 Diversity of Marine and Aquatic Vegetation. Develops research proposals that address the ecology, conservation, and management of marine and aquatic plant life.
- MBAQ 401 Field Research in Marine Biology and Aquaculture. Puts sampling and research design to work in a dedicated field research course.
The degree totals 120 credits across up to eight terms a year, and up to 90 transfer credits can apply. Students who want deeper analytical training later can continue into Unity’s MS in Marine Conservation Biology, whose 30-credit research core includes Tools and Technologies for Data Analysis, Quantitative Research Design and Statistics, and GIS and Remote Sensing for Environmental Solutions.
Start Building Your Marine Science Skills With Unity Environmental University
Every float, recorder, and water sample in this story is waiting on someone who knows what the numbers mean. That person usually started with a solid grounding in how the ocean works, then learned to ask it sharper questions.
Unity’s BS in Marine Biology and Sustainable Aquaculture builds that grounding in oceanography, marine organisms, and field research through remote learning built around your current schedule. Tuition rates are locked through 2030, and Unity ranks in the top 1% of universities nationally for social mobility.
Request information about the B.S. in Marine Biology and Sustainable Aquaculture, and our team will help you plan your first term and see how your existing credits apply.
Common Questions About Marine Biology Tools and Data
Short, direct answers to the questions readers ask most.
What Tools Does a Marine Biologist Use?
Marine biologists use data collection tools such as profiling floats, satellites, acoustic recorders, eDNA samplers, nets, and survey gear, along with analysis tools such as statistical software and GIS. Most projects combine several sources so each can check the others.
How Do Marine Biologists Collect Data?
Through a mix of fieldwork and remote observation. Researchers sample water, fish, and plankton from boats and shorelines, while moored instruments, drifting floats, and satellites gather continuous measurements in places and seasons no crew could cover.
What Is eDNA in Marine Biology?
Environmental DNA is genetic material that animals shed into the water through skin, scales, or waste. Filtering and sequencing a water sample can show which species were recently nearby without capturing or even seeing them.
Do Marine Biologists Need to Know Statistics?
Yes. The BLS notes that students in this field may need mathematics and statistics coursework to learn data analysis, and nearly every research or management role relies on statistical methods to estimate populations and detect change over time.
What Is Marine Data Analytics?
Marine data analytics is the practice of cleaning, combining, and analyzing ocean observations, from floats and satellites to fishery surveys and acoustic recordings, to answer management questions. It sits at the overlap of marine biology and data science, and Unity’s guide to becoming a marine data analyst covers the career built around it.
