In this edition of Ask a Marine Biologist, Dr. David Shiffman answers a question about what’s still lurking in the deep.

During a six-day shark Field School in Miami, learning how to perform a shark biopsy and draw its blood (for science) turns this diver into a stronger ocean advocate.

Here’s what it takes to tag 22 sharks in two days, and how shark tagging helps scientists protect them.

Dr. Austin Gallagher has shaped global shark conservation for more than a decade. For his efforts, he has been named our July 2021 Sea Hero.

The bioluminescent species include the blackbelly lanternshark, southern lanternshark and the kitefin shark, the largest luminous vertebrate ever discovered.

Some shark populations have decreased by 70 percent. The oceanic whitetip shark experienced the greatest decline, losing 98 percent of their population in just 60 years.

With careful planning and a bit of luck, some divers get the chance to see hundreds or even thousands of rare animals underwater at once.

The self-propelled ocean cage was originally built to document feeding, fighting and mating events between sharks in Guadalupe.

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