Not just Shark
Pictures: Elasmodiver contains photos of sharks, skates, rays, and
chimaera's from around the world. Elasmodiver began as a simple web
based shark field guide to help divers find the best places to
encounter the different species of sharks and rays that live in
shallow water but it has slowly evolved into a much larger project
containing information on all aspects of shark diving and shark
There are now
more than 5000 shark pictures and sections on shark evolution,
biology, and conservation. There is a large library of reviewed
shark books, a constantly updated shark taxonomy page, a monster
list of shark links, and deeper in the site there are numerous
articles and stories about shark encounters. Elasmodiver is now so
difficult to check for updates, that new information and pictures
are listed on an Elasmodiver Updates Page that can be accessed here:
Bluntly rounded snout. Seven gill slits, posterior slits very short. Single
dorsal fin set well back on body. Upper body sprinkled with small black spots
and usually some white spots. Large size.
At birth 34-45cm. Males mature at 130-170cm. Females mature at 200cm. Maximum
recorded size 290cm. May possibly grow to 400cm.
Coastal sandy bays and rocky shorelines up to the surf line.
Larger individuals inhabit deeper channels. Recorded at 136m but usually found
and distribution: Temperate
coastal waters around the world. Southern Australia, New Zealand, Japan,
Southern Africa, east and west coasts of south South America, and west coast of
North America to Alaska.
Cruises steadily along bays in search of food moving in and out with the tides.
Prefers low visibility - night, turbid water, overcast conditions. Known to
aggregate possibly for mating. Footage from the documentary Shark Quest shows a
group of Broadnose Sevengill Sharks feeding together on a stingray carcass.
Preys on sharks and rays, bony fishes and marine mammals.
Litter size 67-104. but may be higher. Gestation probably around one year
followed by one year of recovery.
Broadnose Sevengill Sharks have been observed spy hopping - holding their heads
above water and seeming to look around. This behavior is rare among sharks but
has been regularly observed in Great White Sharks. it is possibly an adaptation
to aid in the capture of marine mammals.
The Bluntnose Sixgill Shark (Hexanchus griseus) has a very similar body
shape but lacks the seventh gill slit and has less or no spots. The Sharpnose
Sevengill Shark (Heptranchias perlo) has much larger eyes, a more pointed
snout, and flattened, elongated pelvic fins.
Reaction to divers:
The Broadnose Sevengill shark can become aggressive in baited situations e.g.
towards spear-fishermen. In captivity it has bitten aquarium divers.
Although this shark has a broad distribution it is not commonly encountered by
divers. Probably South Africa and South Australia offer the best opportunities
Other diving locations submitted by
Sharks and Rays of the World. Scott W. Michael. Sea Challengers.
and Rays - Elasmobranch Guide of the World. Ralf M. Hennemann. IKAN.