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

Published on Jul 1, 2020
路 DOI :10.1051/E3SCONF/202014702011
Selvia Oktaviyani2
Estimated H-index: 2
(LIPI: Indonesian Institute of Sciences),
Wanwan Kurniawan1
Estimated H-index: 1
(LIPI: Indonesian Institute of Sciences),
Fahmi8
Estimated H-index: 8
(LIPI: Indonesian Institute of Sciences)
Sources
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.
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#1Dharmadi DharmadiH-Index: 4
#2Fahmi FahmiH-Index: 2
Last. Mohammad AdrimH-Index: 2
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Cucut lanjaman (C. falciformis) merupakan salah satu jenis cucut dari famili Carcharhinidae yang umum tertangkap di perairan Samudera Hindia dengan alat tangkap rawai cucut, rawai tuna, dan jaring insang tuna. Penelitian ini dilakukan pada bulan April 2001 sampai dengan Desember 2004 di beberapa tempat pendaratan ikan dan pasar ikan di Pelabuhanratu, Cilacap, Kedonganan-Bali, dan Tanjung Luar-Lombok. Hasil penelitian menunjukkan bahwa hubungan antara panjang total dengan panjang klasper terlihat...
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#1Fahmi (LIPI: Indonesian Institute of Sciences)H-Index: 8
#2DharmadiH-Index: 13
Sharks are commonly caught in Indonesian waters both by target fisheries and as bycatch. Fishers targeting sharks mostly employ drift longlines, whereas tuna longlines and gillnets are the gear mostly responsible for shark bycatch. Our studies on shark fisheries have been conducted since 2006 and have focused on the eastern Indian Ocean region, the most exploited area in Indonesian waters. Sharks are mostly landed as bycatch in the tuna fishery (using longlines and gillnets) in Cilacap, Central ...
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#1Norman G. Hall (Murdoch University)H-Index: 20
#2C. Bartron (Murdoch University)H-Index: 2
Last. Ian C. Potter (Murdoch University)H-Index: 80
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Biological data were recorded for 1265 silky sharks Carcharhinus falciformis collected from fish landing sites in eastern Indonesia. These represented catches taken in most calendar months by gillnetting and longlining in the eastern Indian Ocean and contained individuals ranging from embryos to fully mature adults. The growth zones in centra, which were shown to form annually, were counted in the vertebrae in a sub-sample of 200 fish for ageing purposes. The embryo lengths in the 5 months for w...
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#1Crispina Binohlan (WorldFish)H-Index: 4
#2Rainer Froese (Leibniz Institute for Neurobiology)H-Index: 39
Summary Maximum length reached by fishes is an important parameter that is highly correlated with metabolism and most other life-history traits. However, obtaining maximum length estimates for commercial fishes has become difficult due to the extirpation of large specimens by intensive fishing. Empirical equations are presented that can be used to derive maximum length of fish from length at first maturity, and vice versa.
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#1Stephen J. M. Blaber (O&A: CSIRO Marine and Atmospheric Research)H-Index: 35
#2Catherine M. Dichmont (O&A: CSIRO Marine and Atmospheric Research)H-Index: 31
Last. Fahmi (LIPI: Indonesian Institute of Sciences)H-Index: 8
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The biology of elasmobranchs makes them very vulnerable to fishing pressure and there is increasing international concern over their exploitation. In northern Australia the stocks of some species may be shared with those in southern Indonesia. Indonesia has the highest landings of elasmobranchs worldwide (>100,000 t p.a.) and millions of Indonesian artisanal fishers rely heavily on elasmobranchs taken in target fisheries. They are also taken by industrial trawlers and as bycatch in pelagic tuna ...
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#1Shoou-Jeng Joung (NTOU: National Taiwan Ocean University)H-Index: 14
#2Che-Tsung ChenH-Index: 12
Last. Kwang-Ming Liu (NTOU: National Taiwan Ocean University)H-Index: 19
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Abstract To examine the age, growth and reproduction of silky sharks, Carcharhinus falciformis , in the waters off northeastern Taiwan, 469 specimens (213 females and 256 males) were collected from August 2000 to January 2002 at the Nanfanao fish market, northeastern Taiwan. The relationship between body weight ( W ) and total length (TL) for both sexes combined was expressed as: W =聽2.92聽脳聽10 鈭6 TL 3.15 ( n =聽469, p R ) for both sexes combined data was estimated as: TL聽=聽25.979聽+聽18.197 R ( n =...
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#1Fahmi (LIPI: Indonesian Institute of Sciences)H-Index: 2
#2Kurnaen Sumadhiharga (LIPI: Indonesian Institute of Sciences)H-Index: 2
A study on four common shark species in Indonesia, the spinner shark Carcharhinus brevipinna (Muller and Henle, 1839), silky shark Carcharhinus falciformis (Bibron, 1839), spot-tail shark Carcharhinus sorrah (Valenciennes, 1839) and scalloped hammerhead Sphyrna lewini (Griffith and Smith, 1834) was conducted at several shark landing sites in western Indonesia from March 2002 to December 2004. Data were collected from the surveyed areas including the length of frequency, sex composition and lengt...
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#1William T. WhiteH-Index: 31
#3John D. StevensH-Index: 32
Last. DharmadiH-Index: 13
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THE second annual meeting of the American Elasmobranch Society (AES) was held in June 1986 in conjunction with the 66th annual meeting of the American Society of Ichthyologists and Herpetologists (ASIH) at the University of Victoria, Victoria, British Columbia, Canada. Thirty-two papers were presented on aspects of the natural history, biology, physiology and behavior of sharks, skates and rays including a one-half day symposium entitled "Shark-Human Interaction." Six of those papers are include...
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The silky shark, Carcharhinus falciformis, and scalloped hammerhead, Sphyrna lewini, represent >80% of the shark by-catch of the winter swordfish/tuna longline fishery of the northwestern Gulf of Mexico. This catch represents a potential supplemental fishery, yet little is known of the life histories of the two species. This report relates reproductive biology data to age and growth estimates for 135 C. falciformis and 78 S. lewini. Unlike other regional populations, C. falciformis in the Gulf o...
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