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
California Swell Shark, Swell Shark, Swellshark, Balloon Shark.
акула раздувающаясяRussia FedRussian
акула калифорнийская раздувающаясяRussia Russian
ralok kalifornský nafukovacíCzech RepCzech
Name: Cephaloscyllium ventriosum
First dorsal fin
rounded and set well back behind pelvic fin origin. Second dorsal fin smaller
and positioned over anal fin. Eye large and golden. Spiracle small. Dorsal
coloration light brown with darker brown patches and saddles fringed with small
off white dots. Many small black dots cover entire length of body and fins. Body
shape may appear flabby or rotund if threatened.
Found on continental shelves and shallow inshore rocky reefs and kelp beds. Often
seen under ledges or tucked into crevices.Max recorded depth 457m.
and distribution: Eastern Pacific from Central California coast to
the Gulf of California (Baja) and Southern Mexico. A southern population occurs
in central Chile but this population may eventually prove to be a distinct
Behavior:Nocturnal. California Swell Sharks lodge themselves in reef crevices by day. At
night they leave their shelter to hunt for bony fishes, molluscs and
crustaceans. When necessary the swell shark can fill it's stomach with water or
air. This capacity helps the swell shark lodge itself securely in its resting
spot. It may also make it too large for a predator to tackle.
Regarded as Least Concern by the IUCN. While little information on
the species is available there are no major threats to the species.
It is not targeted commercially and its habitat of rocky reefs
affords it general protection from fishing activities (i.e., bycatch
of trawling). Occasionally caught by recreational anglers and
divers. Cephaloscyllium spp. are generally hardy with high survival
rates if discarded. They are popular in the marine aquarium trade
and an effort should be made to determine the extent to which this
species enters that trade. Globally the species is assessed as Least
Concern, but is considered Data Deficient for the Chilean
subpopulation where no information is available.
Swell sharks lay two flattened egg cases that they attach to the reef with long
tendrils that extend from one end.
Refugio Beach, California, USA.
The California Swell Shark is the only shallow water catshark found in
Reaction to divers:
Swell Sharks generally stay completely motionless when encountered during the
day. They may attempt to swell up if harassed but remain within the
confines of their hiding places.
logistics: Refugio Beach north of Santa Barbara is a great
place to find California Swell Sharks. Swim out to the kelp forest at the
southern end of the beach and descend at the edge of the kelp in about 15ft of
water. Follow the reef edge or enter the forest and swim out and south until you
find the largest ledges, some of which are big enough to park a small car under.
The swell sharks are usually hidden in the deepest crevices.
Read the shark
diver magazine article on diving with California Swell Sharks
Citations: Garayzar, C.V. 2006.
Cephaloscyllium ventriosum. The IUCN Red List of Threatened Species.
Version 2015.2. <www.iucnredlist.org>