Although we love to photograph all sharks, our favorite is the great hammerhead (Sphyrna mokarran). Generally, it is a cautious shark and will keep its distance from scuba divers. There are 9 species of hammerhead sharks worldwide but the great hammerhead is the largest. An average adult reaches lengths of about 3.6 to 4.3 meters (12-14 feet) but can reach 6 meters (20 feet) and exceed 550kg (1,200 pounds).
Great hammerheads are newer sharks on the evolutionary scale and have developed some unusual characteristics. The unique feature of this shark is obviously the head. The “hammer” which is called a cephalofoil is full of electrical sensors. These pores called ampullae of Lorenzini aid in hunting as these sensors pick up electrical signals given off by all living creatures including humans.
As you view these photographs notice how different the shark can look depending on the angle of the photograph. On a larger shark, the cephalofoil is about a meter (3 feet) in length and the eyes are at the ends which gives it a large range of vision.
The diet of this shark is diverse. They will feed on a variety of fishes including tarpons, porcupine fish and even other sharks. As well, lobster, squid, and octopus form part of their diet. However, their favorite food is rays. Stingrays bury themselves in the sand and the great hammerhead uses its cephalofoil with its electrical sensors to detect their location.
Chiba Peninsula in Japan is home to numerous varieties of shark. Banded Houndsharks, seen in the video of our last post, are the most numerous in the location where we are diving. We have seen hundreds on most of our dives. Big Fish Expeditions has organized this trip and the local dive company we are diving with is Ito Diving Service Bommie (known as Bommies) and is owned by Kan Shiota. Kan has been indispensable assisting us on every dive. Here Kan is giving the dive briefing along with Kenji Ichimura. Kenji has been part of our group from the beginning and has acted as chauffeur, dive guide, and most important, our interpreter. Meals and menus would have been a challenge without him so thanks Kenji!
The dive boat behind us (photo below) is just a short 5-minute ride to the dive site. The gear gets packed up after the dive and is ready to go back to the shop. Amazing what you can store in these tiny pickup trucks!
Of course, the highlight of the trip is the Banded Houndsharks. There are literally hundreds of these beautiful sharks at this site. Although typically shy, they will come near you, if you stay in one place. Tricia, as you can see is making some new friends.
However, their generally shy and cautious nature can change in a moment when food is around. There can be a hundred in a feeding frenzy all jostling for position. It is a bit surreal to swim through them when this is going on but they are only interested in the food, not divers.
In amongst the Banded Houndsharks are curious & often pushy Red Stingrays who we felt a number of times brushing against our heads. It is interesting to see the vibrant yellow markings on the underside of their body. As Larry swims off to locate some more sharks I captured this picture.
Mission accomplished! We came to Japan to photograph Banded Houndsharks and wow did this dive ever deliver! Watch this video clip to experience a bit of what we saw on our dives today.