The
basking shark is the second largest fish species of the world.
It reaches 12-15 metres in length and weigh 3500-4000 kilogrammes.
Legendary animals reach 21 metres in length.
It feeds on plankton like the baleen whales, and therefore it can
often be spotted with its dorsal fin and tail above above the surface
of the sea. Sometimes it is spotted a short distance off the
coast, where it basks after feeding on warm days. The gills are
large and wide with a myriad of spikes to stop the plankton from
getting through. It is estimated, that the shark can filter 1500
tonnes of seawater through the gills per hour.
It reaches puberty at the age of 3-4 years, when it is about 7 metres
long. The gestation period is two years for 1-2 offsprings,
which are 1,5 metres long at birth. The basking shark either
stays alone or in schools of 50-250 animals. It is mainly to be
found to the south of Iceland. It is spotted in the Orkneys area
and further south during summer, where it travels in the direction of
Norway to stay in the Gulf stream. In the fall, it returns, and
in November it most probably heads for deeper seas. At this time
it looses the gill spikes and has to starve until they develope again
in February.
This shark cannot be caught on hooks. It has to be harpooned.
Its liver weighs close to 25-30% of the total body weight (500-700
kilogrammes). After it has been processed, it delivers 6-15
hectalitres of oil, which is very rich in vitamin A.
During the period between 1860 and 1880 it was exploited indiscreetly
in Icelandic waters and its live stock diminished. After that it
has not been hunted much and has recovered enough to become a common
sight again. |