Jeff Christiansen offers presentations on sixgill sharks. These creatures, living under the waters of Puget Sound and Elliot Bay, are a huge source of curiosity for many divers. Christiansen is the man with many of the answers about these creatures of the Sound. The bluntnose sixgill shark is listed as lower risk/near threatened on the International Union for Conservation of Nature and Natural Resources (IUCN) Red List of Threatened Species. Nonetheless, the sixgill population could be in trouble so Christiansen spends his time educating people about them. Many shark species are in decline due to human activities and what little we know about sixgill life history and population characteristics puts it in a class similar to shark species shown most vulnerable to human impacts.
Jeff Christiansen is a biologist and chief diver at the Seattle Aquarium. He specializes in Bluntnose sixgill sharks, or Hexanchus griseus, the third-largest predatory shark in the world, which can be found in the Puget Sound area. Christiansen is part of a joint research team studying sixgill sharks, using genetic research, visual markers and acoustic tracking to study the creatures’ habits.
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When you think of diving for tropical fish, you probably don’t think of Rhode Island...especially in late September.
Come visit Isla de Guadalupe with writer Bruce Watkins and see the best place to observe and photograph these fascinating animals.
Meet the newest member of the Dive News Network, and no we aren't talking about a person!
For over 15 years Ernie Arellano has been in the forefront of dive industry innovations for other companies but now Arellano is striking out on his own. 
