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:
Long pointed snout. Slender body. Dorsal coloration is uniformly grey to copper
brown above (without scattered
white spots). Interdorsal ridge present. First dorsal starts directly
above or just in front of free rear tip of pectoral
fins. Second dorsal very low with long free rear tip.
Pectoral fins with thin light/white posterior margin. White line also on
posterior margin of lower caudal
fin, sometimes inconspicuous. Upper caudal margin dusky or black. Long labial furrows.
At birth 31-34cm. Males mature at 93-96cm. Females mature at 83-95cm. Maximum
size at least 129.5cm but possibly 154cm.
Recorded as inhabiting depths from
Intertidal to 27m but long liners in the Gulf of Mexico
regularly fish for Pacific sharpnose sharks with bottom hooks set at 80m. Mostly
over muddy substrate.
Eastern Pacific from
Southern California to Peru including the Sea of Cortez.
Fairly abundant in the Sea of Cortez but heavily fished. Longline fishermen have
reported significant declines. Anecdotally, in 2009 on one trip with shark
fishermen from Mulege 1400 hooks yielded seven small sharpnose sharks compared
to more than 1700kg in one day 20 years ago. IUCN not evaluated.
Litter size 1 to 12. Unlike in the Atlantic sharpnose shark no correlation has
been found between the litter size and size of the female. Average litter size
Small demersal fishes, cephalopods and crustaceans.
Sea of Cortez, Mulege, Baja,
Mexico. These images were taken with the help of artesanal
longline fishermen aboard a small wooden panga about 4km from shore. These are
probably the first images of live, free swimming Pacific sharpnose sharks.
The Pacific sharpnose shark can be positively identified by
location because there are no other sharpnose sharks along the Pacific coast of
the Americas. Conceivably it is possible that some Caribbean and/or Brazilian
sharpnose sharks have made their way through the Panama Canal. This has been
documented in a number of species including some elasmobranchs.
Reaction to divers:
Rarely if ever encountered by scuba divers due to their timidity and preference
for turbid water and sand/mud bottoms.
See reaction to divers above. Elasmodiver would be very interested in hearing
about any natural encounters.
Other diving locations submitted by
Observations on the Biology of the Pacific Sharpnose Shark (Rhizoprionodon
logurio, Jordan and Gilbert, 1882) Captured in Southern Sinaloa, Mexico.
Marques-Farias, Corro-Espinosa & Castillo-Geniz 2005.