Patikawa on tanimbar:

In Tanimbar,there was an idol behind the village. The idol was called
"Hula Soxu," which means, "Great God.", It was in the form of a maqeuq
(mangeung, or shark), with the head of an ordinary fish.  That is, the
head was like that of an ordinary fish, but the tail was like that of a
shark.  It was in the alang-alang grass, beneath a hanua tree.  They
covered part of its body with cloths, and periodically brought it new
cloths.  In their cult, they do not kill sharks, and if they are in the
water,the sharks will not harm them.  I have never seen the members of the
cult feed a shark.  They believe the shark is their god.  This was on the
south coast.

I have seen people call sharks on the north coast of Tanimbar, but this
was not to worship them.  Every August, they kill sharks that come in
schools at Adodo (Fordata).  (There is an Adodo at Fordata, and another
Adodo at molo).  The tuan negeri gathers food of different varieties that
come from the fields, and brings it to the shore, where the sharks will
come.  There he beats upon an instrument of bamboo.  Those who will kill
shark must wait a little back from the water.  Then the tuan negeri speaks
and becons to the sharks until many have come in, and when he feels the
time to be ripe, he commands the people to come with their spears.  Some
have steel spears, but others have only spears of bamboo.  The tuan negeri
must stab first.  then the rest join in.  I do not knowthe words he used
to callthe sharks, and I doubt if anyone else knewthem.  Sometimes they
killed up to 40 or 50 sharks.  This ceremony was not for religious
purposes, but the people killed to eat.

There was no "kakehan" on Tanimbar.  Kakehan is found around Seram.