The Dorsal Fin

CNN ran a feature this morning on about the effects of the oil spill on sharks. The video feature itself focuses on Neil Hammerschlag‘s tagging of sharks touches on the potential effects that the oil spill in the Gulf of Mexico could have on shark populations there. Hammerschlag also points out that a hammerhead shark he had been tracking via a satellite tag stopped transmitting data right around the time of the Deepwater Horizon explosion, although Hammerschlag went on to say that a number of factors could have contributing to the termination of the data being transmitted. Hammerschlag’s research teams hopes to gather information from the tagged sharks with regard to whether or not they will be swimming through water contaminated with oil from the spill. You can read the full article at CNN.com.

KABC News is reporting that a 13-year-old North Carolina teen is expected to fully recover after being bitten twice on her left leg while swimming off Topsail Island in North Carolina. Carley Schlentz’s wounds required 60 stitches. While doctors expect her to recover fully, she will be on crutches for the next few weeks and her mother said she may need reconstructive surgery after the wounds heal. The species of shark involved in the attack has not yet been determined.

According to New England Cable News (NECN), a 7′ great white shark was caught, tagged and released in Stellwagen Bank. The shark was caught and released by the crew of a Gloucester, Massachusetts sportfishing charter boat. Dr. Gregory Skomal, of the Massachusetts Division of Marine Fisheries, identified the shark as a great white. The article from NECN does not elaborate on what type of tag was used on the white shark.

Note: The video above is loops through an 8-second clip of the white shark after it was hooked. After you’ve seen the first 8 seconds, you’ve seen all there is to it.

Isla de Guadalupe is considered by many to be the best great white sharking diving site on the planet.

Pete Thomas has put together an interesting article, “Danger level on the rise for great white shark divers at Guadalupe Island” over at GrindTV.com. The article touches on what some view as less than shining moments that have gone on at Guadalupe over the past few dive seasons, including Amos Nachoum’s cageless diving offering, and the incident involving a "shark wrangler" accidentally sticking his hand in a white shark’s mouth that was caught on film by Don Carpenter. The article also features some comments from several dive operators addressing some of these issues.

I’m not sure I completely agree with the wording of the headline of the article, in the sense that the danger level itself has increased for divers at Guadalupe, rather it seems as though some divers are simply participating in more dangerous behavior. Thomas certainly brings up some valid concerns. It’s hard to argue that some of the behavior that has gone on at Guadalupe doesn’t increase the level danger associated with diving with these animals, especially when established guidelines are ignored. (Admittedly, the bit in the article about divers being instructed to keep limbs inside the cage is news to me.)

UK’s TelegraphTV recently posted this nice piece of video footage of a basking shark off of Isle of Man. The video was shot by Craig Whalley, while he was kayaking. For an underwater video shot from a kayak, it’s some fairly impressive footage.

The basking shark (Cetorhinus maximus), a filter feeder, is the second largest known species of shark.