SOME BIOLOGICAL ASPECTS OF SCALLOPED HAMMERHEAD SHARKS (Sphyrna lewini Griffith & Smith, 1834) CAUGHT FROM COASTAL FISHERIES IN THE EASTERN INDIAN OCEAN
Abstract: Indonesia has the
largest chondrichthyan fishery in the world, with a reported of 105,000 and
118,000 tonnes landed in 2002 and 2003 respectively. Scalloped hammerhead shark
was either targeted or by-catch from this fishery, mostly for its fins. Despite
of the growing concern around the world, the availability of biological data of
this species, especially in the Eastern Indian Ocean is still lacking. The
objectives of this paper are to present some biological information (size
composition and sex ratio) of the scalloped hammerhead, from coastal fisheries
in Eastern Indian Ocean. The data used for the analysis comprised of two
components, i.e. survey data in 2010 (February, March, June, August, October
and December) and data from daily monitoring shark landing in 2013 (January to
December). Substantially lower mean size, more immature sharks and more
frequent of female caught over years showed that scalloped hammerhead shark in
the Eastern Indian Ocean are facing intensive fishing pressure which could lead
to overfishing. This could harm the sustainability of scalloped hammerhead
shark resource in the long run. The relationship between clasper length and
total length was positively correlated where every 5 cmTL increment on clasper
length adding 51 cmTL on total length.
Keywords: Scalloped hammerhead
shark; sex ratio; clasper length; eastern Indian Ocean
Author: Umi Chodrijah, Bram
Setyadji
Journal Code: jpperikanangg150052
