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David Shiffman, Ph.D.

Dr. David Shiffman is a marine conservation biologist who studies threatened sharks and how to protect them.

The Shark, Billfish and Tuna Organization All Divers Should Know About

Dr. David Shiffman shares his "organizations divers should know about" pick of the month featuring NOAA Highly Migratory Species Division.

Do Sharks Behave Differently at Night?

Latest Ask a Marine Biologist

Organizations Divers Should Know: The International Seabed Authority

Learn about the United Nations body that controls deep sea mining

Does Flash Photography Hurt Marine Life?

Photographs of marine animals can educate and inspire. In this edition of “Ask a Marine Biologist,” Dr. David Shiffman discusses whether taking those photos hurt the animals.

How Common Are Stranded Sharks Like the Frozen One in Cape Cod?

In this edition of Ask a Marine Biologist, Dr. David Shiffman answers questions recently sparked by a frozen shark found in Cape Cod.

Are Sharks Mammals? (No!)

In this edition of Ask a Marine Biologist, Dr. David Shiffman answers one of the most-asked questions about sharks—are they mammals, fish, or something else?

How Do Sea Turtles Breathe? Fun Facts You Should Know about Sea Turtles.

Here’s everything you should know about sea turtles, including how long they live, how fast they can swim and where they lay their eggs.

How Much of the Ocean Has Been Explored? 17 of Your Ocean Questions, Answered.

Marine biologist Dr. David Shiffman provides the ocean facts you want to know in this marine Q&A!

How Intelligent Are Octopuses? Your Octopus Questions, Answered.

Here’s how many brains and arms octopuses have, how long they live, what octopuses are, and more.