Most salmon sharks head south and roam the warm waters offshore of Hawaii, California and Mexico until the spring, when they begin their journeys back to Prince William Sound.

Who'da thunk that a shark could be warm-bodied, but salmon sharks are.

Barb Block from Prince William Sound. The salmon shark team has arrived in Cordova and we're preparing to leave this morning for Gravina Bay.We hope to tag 30 or more

Barb Block, tagging salmon sharks in Alaska. We arrived in Gravina Bay on Sunday, and begain our operations on Monday to catch salmon sharks.

Barb Block, salmon-tagging in Alaska. Today in Prince William sound was perfect. I was in the work skiff much of the day.

Barb Block, salmon-tagging in Alaska. Well, yesterday was not the day we shark taggers dream of. It was the day that reminds me why few have done this work before.

Barb Block, salmon-shark tagging in Alaska. Our last day in Gravina Bay on Friday was spectacular. Every vista was different: Snow peaks and fir trees. Velvety green meadows. In all directions, trees with eagles roosting. We began the day with some quick catches and successful tagging. We were able to put out 4 tags before the weather came in with winds that made drifting a bit tricky. We ended the day with 18 successful tagging events, most sharks with multiple tags.

Jane Stevens at Hopkins Marine Station, Pacific Grove, CA - Geoff Widdows is the first person to tell you that another name for Yakutat, Alaska, in the winter is Deadsville. So when Aaron Carlisle, a graduate student who studies salmon sharks sent an email to all (five) of Yakutat's charter boat captains to ask them to go on a treasure hunt for a satellite tag that would win one lucky guy $1,000, you'd think that they would've been scrambling all over each other for a chance at a little excitement.

Working with new satellite tagging technology and a new TOPP species has yielded impressive results for scientists and students from Stanford University's Hopkins Marine Station.

Nothing is more emblematic of the ocean's hidden mysteries than a shark's dorsal fin on the horizon. Unfortunately, following sharks beneath the sea surface has been technically daunting, and until recently, we’ve known very little about how these top predators use the ocean realm. Today however, scientists are rapidly mapping the shark's habitat, with the help of advances in electronic tag technology. The dorsal fin on the surface -- which once evoked the unknown -- now helps provide information that may help conserve some shark species.