Fin Length and Total Length Relationships of Silky Shark Carcharhinus falciformis Landed at Tanjung Luar Fish Landing Port, West Nusa Tenggara, Indonesia

Selvia Oktaviyani,Wanwan Kurniawan,Fahmi Fahmi,A Isnansetyo,N Huda,I Dewi Puspita,A Dwi Jayanti,R Ida Adharini,R.C Bhujel,D Wahyu Kartika Sari,Mgs M Prima Putra

doi:10.1051/e3sconf/202014702011

Abstract

Shark fins are a very valuable product for international trade. This study aims to obtain the equations describing the relationship between fin length and the total length of silky shark. Using the total length at sexual maturity (Lm), the equation is then used to estimate the fin length associated with this Lm, which can then be included in the recommendation for international shark fin trades. Data collection was carried out from March 2018 to February 2019 at Tanjung Luar Fish Landing Port, West Nusa Tenggara. All data were collected from 2,837 individuals of silky sharks, consisting of 1,416 females and 1,421 males. The total length of silky shark ranges from 61 to 282 cm for females and 18-283 cm for males. The relationships of first dorsal fin length and total length is DFL=2.0151+0.1243 TL (both sexes). Furthermore, the relationships of pectoral fin length and total length were found to be PFL=-8.0098+0.2127 TL (both sexes). The first dorsal fin length and pectoral fin length at the time the silky shark sexually matures were 23 cm and 35 cm, respectively. This fin-total length relationship can be used by the fisheries authority to determine the allowed minimum size of silky shark fins for export.

Highlights

Carcharhinus falciformis or silky shark is a pelagic fish species that inhabit oceanic waters, beyond the continental slope and coastal waters
First dorsal fin length and pectoral length were measured from the fin base to the tip of the fin, for first dorsal fin height was measured from the fin base to the tip of the fin (Fig. 2)
Carcharhinus falciformis or silky shark has a medium size with an elongate and slender body, the snout is narrowly rounded and moderately long

Summary

Introduction

Carcharhinus falciformis or silky shark is a pelagic fish species that inhabit oceanic waters, beyond the continental slope and coastal waters. They commonly live near the surface to a depth of 500 m [1, 2]. This species is most commonly fished in seven Indonesian Fisheries Management Area (WPP), i.e. WPP 711, 572, 573, 713, 714, 716 and 717 [4]

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Conclusion