Not just a
huge collection of
Elasmodiver.com contains images of sharks, skates, rays, and a few
chimaera's from around the world. Elasmodiver began as a simple web
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 photography.
now more than 10,000 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
The shortnose spurdog has a short snout with a
obtusely pointed tip. Dorsal fin apices maybe black or dusky edged.
First dorsal fin spine is opposite or slightly posterior to free rear tip of
pectoral fins. Pectoral and caudal fins have white posterior margins. Pelvic fin
positioned midway between dorsal fins. Eyes large. Mildly venomous spines on
first and second dorsal fins. Anal fin absent. Ventral coloration white.
length 77cm. size at birth 20-25cm. Mature males 34-51. Mature females 37-62.
Temperate and tropical continental shelf from
surface to 732m.
Abundance and distribution:
A common to abundant species in theEastern Atlantic from Spain to North
Africa and West Africa to South Africa around the Cape of Africa to Madagascar.
Also eastern Indo-Pacific in Australia, China and possibly elsewhere.
suggests that the shortnose spurdog is actually a complex of multiple closely
related but geographically isolated species.
Status: The shortnose spurdog is listed as Data Deficient by the IUCN.
However, it is taken in significant quantities in bottom trawls and also caught
with lines and mesh nets. Squalus megalops is one of the most abundant
chondrichthyan species on the outer continental shelf and upper slope of
southern Australia. Its distribution includes some heavily fished areas, for
example, off southeast Australia, although significant declines have not been
documented to date. It is a minor component of the demersal gillnet fisheries
through Bass Strait, off South Australia and Western Australia. However, S.
megalops is too small to be readily captured by gillnets, particularly the 6 to
6½-inch mesh of shark nets, and there has been no detectable changes in catch
rates of this species by commercial shark gillnets in Bass Strait since the
1970s. There are large regions around southern Australia where S. megalops is
not greatly impacted by fishing, including a large area off the northern west
coast which is closed to shark fishing. Consequently, the species is assessed as
Least Concern in Australia, but the situation should be monitored because there
are recent indications that fishing pressure may be affecting the local
abundance of the species in some areas e.g., off Ulladulla, New South Wales. It
should be noted that although currently considered a wide-ranging single
species, S. megalops, as assessed here, may in fact be an Australian endemic
pending further taxonomic studies. Due to taxonomic uncertainty, the global
assessment is Data Deficient, pending further study.
Citation: Cavanagh, R.D. & Lisney, T.J. (SSG Australia & Oceania Regional
Workshop, March 2003) 2003. Squalus megalops. The IUCN Red List of Threatened
Species. Version 2014.3. <www.iucnredlist.org>
Often found in large schools but may also be solitary.
Litter size from 1- 6.
has a longer
nose and usually displays scattered white spots.
spurdog Squalus blainville (present in the Mediterranean and along the
west coast of Africa) has a much longer laterally pointed nose, white margined
fins and a thicker more robust first dorsal spine.
Reaction to divers:
Usually found too deep to come in contact with
divers. No known encounters.
None. The video of two shortnose spurdogs on this page was accomplished by
dropping a baited remote camera to approximately 100m.