CSULB White shark study

          Researchers from Cal State University Long Beach have discovered alarmingly high levels of the chemicals DDT and polychlorinated biphenyl in juvenile white sharks off the coast of Southern California. Though the chemicals are toxic, they appear to be having little effect on the young sharks. If you have a minute, swing by and read through their study. It's extremely interesting.

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0062886

Greenland shark in the Gulf?

               A group of biologists from Florida State University got quite the surprise while on expedition in the Gulf of Mexico. Dean Grubbs and his crew were studying species living in the Gulf that may have been affected by the Deepwater Horizon oil spill of 2010, when they came across a 12-foot Greenland shark.

                For those who don’t know, Greenland sharks are a deep water species found primarily in the northern Atlantic Ocean, near the Arctic Circle. They generally range from depths of up to 1200m and prefer water temperatures from anywhere between 34 and 68 degrees Fahrenheit. A few stragglers have been spotted as far south as Argentina and in Antarctic waters, but never in the Gulf of Mexico and not at 6000 ft. So, naturally, when the crew pulled their cabling up to find a massive shark on the end they were understandably shocked. According to Grubbs, it took several hours for the shark to be pulled to the surface. Once there, the shark was loaded on to the boat and the crew began taking samples. Because the basis of the study was toxicology, the team had to take lethal samplings from the animal. Grubbs was quoted by NBC saying that the animal probably would not have lived very much longer in the warmer waters.

                 This story leaves me conflicted. On the one hand, I'm interested in what the FSU team finds when their reports come back. On the other hand, I wish the shark could've been tagged and tracked. I'm not a scientist (yet), just a student, but I would think the shark would be more beneficial scientifically if it were left alive.  That being said, the research crew did find quite a few fascinating bits of information in their examination of the animal. For instance, they found a six-inch stingray barb lodged in the shark's skull, probably the result of a dinner date gone array. They also looked at the stomach contents which included several squid beaks and the egg sac of a skate. Very cool.

Photo credit NBC

     This is hilarious. Enjoy!

Alien Sharks

Kudos to Discovery for actually having a good documentary during this Shark Week. Alien Sharks was amazing! In honor of their achievement for having produced and shown something scientific, I've found some footage I'd like to share.

Goblin sharks are awesome!

Murder Down Under

          I came across a story tonight that is absolutely shocking to me, and instead of continuing our Endangered Species list I'm going to share this story with you. 

         Off the coast of Australia, in the HMAS Adelaide marine reserve, a diver found a 6 ft Mako shark. Unfortunately for both parties, this particular Mako was mutilated and left hanging upside down by its tail tied to a buoy. Not only had the shark been tied up, but it also appeared to have been stabbed several times in the chest. As the area is a protected marine reserve, no fishermen (commercial or otherwise) are allowed inside. But according to Robbert Westerdyk, the diver who found the shark, "It can only have been done by fishermen who should not have been anywhere near the site.." 

         Mr. Westerdyk took photos of the gruesome site and then cut the shark loose. The killing is being investigated by the New South Wales department of fisheries. Below are the photos Mr. Westerdyk shot, and I warn you they are disturbing.


Robbert Westerdyk

         Mako sharks, both shortfin and longfin, are listed as Vulnerable to extinction on the IUCN Red List. The fact that someone slaughtered this animal on purpose and then posed it is absolutely barbaric. No living creature, shark or otherwise, deserves to have their life taken and especially not like this. May the person who did this be found and punished to the fullest extent of the law.

     Here's something you don't see everyday; the Tasseled Wobbegong. This shark is a master of disguise. The Wobbegong has a squashed body shape and a beautiful design that allows it to blend in with its surroundings. It also has fringed skin flaps on its lips that closely resemble seaweed. The Wobbegong lies motionless on the ledges of the reef and quickly snaps up at unsuspecting fish as they swim by.


Photo courtesy of Arkive

Daggernose Shark (Isogomphodon oxyrhynchus)

               For Tuesday’s addition of our “Shark Week Endangered Species List” let’s take a look at the Daggernose shark. This animal is said to congregate in the warm coastal waters off South America, namely Brazil, Venezuela, and Trinidad. The Daggernose, like many other species of shark, is slow to mature and has few pups. Female sharks mature at around 6-7 years and can be pregnant for up to 12 months. Because they do not breed annually, the risk for severe population depletion is great.

                Like many endangered sharks, the Daggernose’ biggest threat is artisanal fisheries and the use of gillnets. These sharks tend to get caught in floating gillnets that are targeting mackerel and King Weakfish. Due to their slow reproduction rate, such high fishing pressure spells disaster for the population and indicates a high risk for extinction. The IUCN recommends the monitoring of fishing vessels that use gillnets in the area, and the release of live sharks that are captured. The website also suggests that the Daggernose be added to the Brazilian National list of Endangered Species. Restrictions being placed on the number of sharks that can be caught and enforcement of these rules would help aid in the conservation of this species. 

Photo courtesy of Encyclopedia of Life