Translation 2783

..,>. 275
i'hesa c_olY;hins are ca..aLle of c^ivinE; to a depth of 300 metres.
(I
Their rna__iritun rate of i.lovem.cnt is about 1û knots.
Jananese fishermen hunt t_!e^i arouna the islands of Tobi and
Goto, 'taking a few hundred annually. Amon^, those ta,^ïen are feL^ales
measuring up to 300---05 cm and males mea.:_urin^• up to 520-330 cm.
The weights of males 1n1 cm and 225 cm in length -were 89 kg and 138
1;,; resceotively.
Harbour Por.-oise (I'hocoena, Ûhocoena;
'^!^^he migrations of harbour -,or-^?oises have not been studied.
'i'hey feed mostly on fishes (Clupeiformes, capelin, etc.).
In oceanarium conditions in ;rinter, ha.i bour porpo i ses eat from 5 to
7 kg of various fish species (herring, eels, sprats,'mackerel, 180
whiting, sand-eels, horse-mackerel, coalfish, etc.) every day.
Their reproduction has not been studied.
Harbour roxpoi ses stay in groups of several animals. They
kee D to coastal waters and do not, as arule, travel far out to sea.
They make shallow dives, lasting for 5-5 minutes. '1.'hey are rarely
seen to lea.-o out of the water or to follow ships. ;ven after being
kept for a long time in an oceetïiâ,ril.uil they beiîct•vc^ --larily, although
they can easily be trained.
Harbour porpoises are not hunted. ln the north of Alaska
the Eskimos take small numbers of thern, and articul^.rly value the
dorsal part of the body.
Common Blackfish (Globice-phala melaena sieboldi)
Little is known about the biology of common blackfish. Seasonal
mi;;rations by them have been repoxted. -- tl-,ey travel to higher
latitudes in summer.
The hunting of comi.non blackfish (,see At^nendi}. 12) is concen-,
tra.ted on the coasts of Japan, where from 60 to 300 are taken every
year. They are hunted all year round, but most are taken from May
to October, with a peak in i•i2.y and June.
The weight of a female 3.0 metres in length was 450 kg.
Killer Whale (Orcinus orca)
The migrations of killer i•riiales have not been investibated.
They feed priz_cil?ally on cepha.lonods and various fis)l species.