Marine biology is the study of life in the sea. If you’re fascinated by living things in the ocean — from tiny plankton and colorful corals to playful dolphins and majestic whales — you might have a passion for marine biology.
People who work in the field of marine biology are called marine biologists. These scientists investigate diverse saltwater ecosystems, from brackish estuaries to deep-sea vents on the ocean floor. They study organisms from tiny, single-celled organisms to giant blue whales, examining how these creatures interact with each other and their environment — e.g., how kelp forests support fisheries and protect coasts, and how sharks play an important role in ocean food chains. Marine biology is essential for understanding and protecting the health of our oceans.