The Blog Aquatic

Donate Today

The Blog Aquatic

News, opinions, photos and facts from Ocean Conservancy

35
Comments

Interview: Dr. Eric Hoffmayer on Tracking Whale Sharks in the Gulf of Mexico

Posted On January 30, 2014 by

Dr. Hoffmayer and a whale shark in the Gulf of Mexico. [Photo: Jim Franks]

(This blog is part of a series of interviews with scientists who are championing marine research in the Gulf of Mexico.)

A preeminent whale shark expert and ecophysiologist, Dr. Eric R. Hoffmayer is a research fishery biologist with the National Marine Fisheries Service, Southeast Fisheries Science Center, Mississippi Laboratories. His interest in coastal shark species ranges from their reproduction and life history to their specific abundance, distribution and feeding ecology in nursery grounds. He has pursued a particular interest in the Gulf of Mexico’s whale sharks, the largest fish in the ocean, compiling information on their basic biology, habitat use and movement patterns.

Ocean Conservancy:  How much is known generally about the whale sharks found in the Gulf of Mexico? What is the size of the population?

Dr. Hoffmayer:  Ironically, even though whale sharks are the largest fish in the ocean, we still know so little about them, specifically here in the Gulf of Mexico. We know from our research efforts, as well as from research efforts of our colleagues in the southern Gulf, that whale sharks are relatively common in the Gulf. Unfortunately, due to their highly migratory nature and preference for offshore habitats, we still do not have a good population estimate for this region. However, colleagues working in the southern Gulf have estimated that between 500 and 900 individuals occur off the Yucatan Peninsula. In the northern Gulf, whale sharks occur along the continental shelf edge from Brownsville, Texas, to the Florida Keys and commonly occur off the mouth of the Mississippi River.

Continue reading »

10
Comments

Can’t Get Enough of Sharks? Check Out Our Best Shark Posts

Posted On August 2, 2013 by

Lemon Shark

Credit: Jillian Morris

“SHARK!” Does the word conjure up images of a fin slicing toward you in the open ocean or on the edge of your seat completely absorbed in one of the year’s best television specials?

In preparation for Shark Week, which starts this Sunday, we’ve put together a roundup of some of our best shark blog posts from the past year:

What’s Your Shark IQ? How much do you think you know about sharks? Before taking a deep dive into the world of these complex creatures, test your basic knowledge with our short quiz. Do you know which shark swims the fastest?

Continue reading »

38
Comments

Test Your Ocean Knowledge: Bull Sharks, Polar Bears and Venom

Posted On July 11, 2013 by

polar bear

Credit: Canadian Coast Guard

How much do you know about the waters that cover 70 percent of Earth’s surface and the creatures that call it home? Test your ocean knowledge with our short quiz.

Study these five questions and see how much you know:

  • What is the largest living structure on Earth?
  • How did bull sharks receive their name?
  • What is the biggest fish in the ocean?
  • What is the most venomous marine animal?
  • How are polar bears able to walk on ice?

Stumped? Click the link below to see the answers.

Continue reading »

1
Comment

Filter Feeding Explained: Whale Sharks vs. Baleen Whales

Posted On May 31, 2012 by

Suddenly out of the deep blue water appears a whale shark directly beneath me. The gentle giant moved gracefully to the surface of the water and began feeding next to me. I had been snorkeling off the coast of Tofo in Mozambique and felt that this was a dream come true. Experiences like this make me appreciate the variety of nature’s feeding techniques. You see whale sharks and baleen whales are both filter feeders, animals that eat by straining tiny food, like plankton, from the water. But how they go about filter feeding is completely different.

In whale sharks, teeth don’t play a major role in feeding. In one of their filter-feeding methods, they suction water into their mouths at high velocities while remaining stationary. Food moves through filtering pads that cover the entrance of their throats. The filtering pads are broad mess pads full of millimeter-wide pores that act like a sieve, allowing water to pass through while capturing food particles. Continue reading »