The length–weight relationships and clasper maturity of two shark (Carcharhinus sorrah, Carcharhinus falciformis) of landed in Prigi Coastal fishing Port Trenggalek East Jawa

Abstract

Sharks are often found in all the waters are scattered in various regions of the world. On the other hand, shark fisheries have declined globally due to shark fishing as well as the demand is very high. The length-frequency distribution for Carcharhinus sorrah distributed between 33-131 cm in Carcharhinus falciformis is distributed between 51-161 cm. The length-weight relationship of Carcharhinus falciformis between is allometric negative, while on Carcharhinus sorrah allometric positive. The maturity level of shark in august in the Full Classification (FC) category,5.6% in the Non Full Calcification (NFC) category 7.4% and in the Non-Calcification (NC) category 87.0%, September in the Full Classification (FC) category, 48.7% in the Non Full Calcification (NFC) category, 17.9 % and in the Non-Calcification (NC) category 33.3 %, October in the Full Classification (FC) category, 72,7 % in the Non Full Calcification (NFC) category, 6.1 % and in the Non-Calcification (NC) category 21.2 %. The maturity level of the clampers in FC (Full Classification) conditions occurs in October and Males are the most common. The sex ratio of the spot-tail shark (Carcharhinus sorrah) was dominated by male fish, with the maturity class being dominated by non-calcification (NC). whereas in silky sharks (Carcharhinus falciformis is dominated by females, while in january many Immature / Non-Calcification (NC) months of march are dominated by Ripe / Full-Calcification (FC). This study provides information about the length-weight relationship and clasper matured for two shark species whose results will be used for stock assessment and sustainable management of sharks.