"Sleepy with small head".. this
is the meaning of the scientific name Somniosus microcephalus,
but in reality Greenland shark is not only a slow abysmal creature. Also
for this animal in fact, in spite of uis name, powerful and fast
releases to capture the preys and resistance and tenacity in hunting are
The Greenland shark in fact eaches notable dimensions, from the 240-400 cm to a maximum of 640 cm (is held possible the maximum dimension of 730 cm).
A real giant of the polar regions, of grey-brown color, uniform, with some times clearer stains on the back. An exceptional evolutionary adaptation allows this sea creature to quietly live in waters with temperatures that go since 0.6 to the 12 centigrade degrees and to sink him up to 1200 m of depth (during the winter months more next to the surface, in the summer among 180-550 m).
The face of Greenland sharl is
short and rounded off and the eyes are small. The two dorsal fins are
without thorns, the anal fin is absent. Also the pectoral fins and
ventral ones are of small dimensions while the caudal fin is enough
developed, both the superior lobe and that inferior.
The teeth are different in the two arcades, in that superior they are thin and pointed, while in that inferior more breadths, resistant, with the cusp moved toward the outside.
The Greenland shark nourishes
him both of carcasses of sea mammals and of real preys, to pursue and to
capture, as bony fishes, and seals.
It would result even that the
parasitic Ommatokoita elongata can be able to send a small light
that could attract the preys near in the mouth of the Greenland shark,
preys attracted by a small luminescence in the dark and icy depths of
the arctic waters.
The reproduction of this shark seems to be viviparous without placenta.
The native people of Greenland
have fished for a long time this shark to use the oil of the great
liver, rich of vitamin Á. and also for the meat, that results edible if
dried, toxic, even poisonous, if eaten fresh.
Greenland shark video at great depth
Bibliography: "Sharks & Rays, Elasmobranch
Guide Of The World". Ralf M. Hennemann,
Marco Angelozzi -