Isotopic niches of the blue shark Prionace glauca and the silky shark Carcharhinus falciformis in the southwestern Indian Ocean

2012 ◽  
Vol 17 (1) ◽  
pp. 83-92 ◽  
Author(s):  
N Rabehagasoa ◽  
A Lorrain ◽  
P Bach ◽  
M Potier ◽  
S Jaquemet ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Silky Shark ◽  
Carcharhinus Falciformis ◽  
Southwestern Indian Ocean

scholarly journals KOMPOSISI DAN FLUKTUASI HASIL TANGKAPAN IKAN CUCUT DOMINAN YANG TERTANGKAP RAWAI TUNA PERMUKAAN

2017 ◽  
Vol 14 (4) ◽  
pp. 371
Author(s):  
Dharmadi Dharmadi ◽  
Suprapto Suprapto ◽  
Agustinus Anung Widodo
Keyword(s):  
Indian Ocean ◽  
Total Catch ◽  
Fishing Activity ◽  
Prionace Glauca ◽  
Long Line ◽  
Landing Sites ◽  
Silky Shark ◽  
The Indian Ocean ◽  
Carcharhinus Falciformis ◽  
Catch Composition

Perikanan rawai tuna memiliki kontribusi cukup besar terhadap hasil tangkapan ikan cucut (Requiem shark sp.) di perairan Samudera Hindia. Hasil tangkapan rawai tuna sebagian besar didaratkan di 2 pendaratan ikan utama yaitu Pelabuhan Perikanan Pelabuhan Ratu dan Pelabuhan Perikanan Samudera Cilacap. Kegiatan penelitian untuk mengetahui komposisi dan fluktuasi hasil tangkapan ikan cucut (Requiem shark sp.) dominan pada rawai tuna permukaan berbasis di 2 lokasi pendaratan ikan tersebut dilakukan pada tahun 2004. Hasil penelitian menunjukkan bahwa komposisi hasil tangkapan cucut (Requiem shark sp.) pada rawai tuna permukaan didominansi oleh jenis ikan cucut karet atau selendang (Prionace glauca) antara 40 sampai dengan 90%, sedangkan komposisi jenis ikan cucut lain seperti ikan cucut lanjaman (Carcharhinus falciformis dan Carcharhinus sorrah), cucut paitan (Alopias superciliosus), cucut tikusan (Alopias pelagicus), dan cucut mako (Isurus sp.) antara 3 sampai dengan 30%. Hasil tangkapan ikan cucut (Requiem shark sp.) terhadap hasil tangkapan total rawai tuna permukaan antara 5 sampai dengan 25% pada tahun 2004 dari rata-rata 85 unit kapal rawai tuna yang beroperasi di perairan Samudera Hindia. Hasil tangkapan ikan cucut (Requiem shark sp.) tertinggi terjadi pada bulan Juli sampai dengan Agustus. Hasil tangkapan ini berkaitan dengan kondisi cuaca (Requiem shark sp.) pada saat nelayan melakukan penangkapan ikan di laut. Tuna long lines fisheries have more contributed on the catch of shark (Requiem shark sp.) in the Indian Ocean. Most of catch from tuna long lines landed at two main landing sites of tuna long line which operated in the Indian Ocean were Pelabuhan Ratu and Cilacap. This study was conducted at that two landing sites during 2004. The result showed that shark (Requiemshark sp.) catch composition on tuna long line was dominated by blue shark, Prionace glauca (40 to 90%), while other sharks i.e. silky shark (Carcharhinus falciformis), spot tail shark (Carcharhinus sorrah), big eye thresher (Alopias superciliosus), pelagic thresher (Alopias pelagicus), and mako shark (Isurus sp.) between 3 to 30% from the total catch of shark (Requiem shark sp.). Percentage catch of sharks (Requiem shark sp.) againts total catch of tuna surface long line during 2004 was ranging 5 to 25% from everage of 85 unit of tuna long line boat that operated in the Indian Ocean. Catch fluctuation related with the weather conditon when the fishers are fishing activity at sea. The high catch of shark (Requiem shark sp.) was occur on July until August.

scholarly journals Age and growth of the blue shark (Prionace glauca) in the Indian Ocean

2019 ◽  
Vol 211 ◽  
pp. 238-246 ◽  
Author(s):  
I. Andrade ◽  
D. Rosa ◽  
R. Muñoz-Lechuga ◽  
R. Coelho
Keyword(s):  
Indian Ocean ◽  
Age And Growth ◽  
Blue Shark ◽  
Prionace Glauca ◽  
The Indian Ocean

Demographic and harvest analysis for blue shark (Prionace glauca) in the Indian Ocean

2021 ◽  
Vol 41 ◽  
pp. 101583
Author(s):  
Zhe Geng ◽  
Yang Wang ◽  
Richard Kindong ◽  
Jiangfeng Zhu ◽  
Xiaojie Dai
Keyword(s):  
Indian Ocean ◽  
Blue Shark ◽  
Prionace Glauca ◽  
The Indian Ocean

scholarly journals Vertical distribution of blue Shark (Prionace glauca) in The Indian Ocean

2021 ◽  
Vol 322 ◽  
pp. 01009
Author(s):  
Fathur Rochman ◽  
Gussasta Levi Arnenda ◽  
Arief Wujdi ◽  
Roy Kurniawan
Keyword(s):  
Indian Ocean ◽  
Vertical Distribution ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Survival And Reproduction ◽  
The Indian Ocean ◽  
By Catch ◽  
Tuna Fisheries ◽  
Longline Fisheries ◽  
The Vertical Distribution

Each fish species tends to choose a suitable environment suitable for its survival and reproduction horizontally and vertically. Blue shark (Prionace glauca) is the dominant catch of pelagic sharks by-catch in the Eastern Indian Ocean longline tuna fishery, with about 70% of the total sharks caught in this fisheries. This study aims to provide the information and the vertical analysis distribution of blue sharks based on temperature and depth in the Indian Ocean. The scientific observer collected 2,951 set-by-set longline fishing data based on Research Institute For Tuna Fisheries (RITF) from January 2006 to December 2018, on which the present analysis was made. The mini logger was used to measure the vertical distribution of blue sharks in the longline fisheries. This result indicated that blue shark was caught between 75.18-445.46 m depth, with 84% of which live at thermocline area (70-300 m depth), and 16% lived in underlayer area (>300 m depth). Blue sharks distributed in the underlayer area have a larger body size than those in the thermocline area with a size >180 cmFL compared to 50-170 cmFL in the thermocline area.

scholarly journals Mitochondrial genome of the silky shark Carcharhinus falciformis from the British Indian Ocean Territory Marine Protected Area

2020 ◽  
Vol 5 (3) ◽  
pp. 2416-2417
Author(s):  
Shaili Johri ◽  
Taylor K. Chapple ◽  
Elizabeth A. Dinsdale ◽  
Robert Schallert ◽  
Barbara A. Block
Keyword(s):  
Indian Ocean ◽  
Mitochondrial Genome ◽  
Protected Area ◽  
Marine Protected Area ◽  
Silky Shark ◽  
Carcharhinus Falciformis

scholarly journals PARAMETER POPULASI HIU KEJEN (Carcharhinus falciformis) DI PERAIRAN SELATAN NUSA TENGGARA BARAT

2018 ◽  
Vol 9 (3) ◽  
pp. 175
Author(s):  
Umi Chodrijah ◽  
Irwan Jatmiko ◽  
Agus Arifin Sentosa
Keyword(s):  
Mortality Rate ◽  
Indian Ocean ◽  
Total Mortality ◽  
Survey Method ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Fish Samples ◽  
Silky Shark ◽  
The Indian Ocean ◽  
Carcharhinus Falciformis

Hiu kejen atau silky shark (Carcharhinus falciformis) merupakan salah satu spesies hiu dari famili Carcharhinidae yang banyak tertangkap di Samudera Hindia Selatan Jawa. Berdasarkan keputusan sidang CoP-17 di Johannesburg species ini masuk dalam daftar merah Apendik II CITES, sejak saat itu pengelolaan hiu kejen menjadi perhatian khusus pada perikanan tangkap. Tujuan penelitian ini adalah untuk mendapatkan informasi parameter populasi ikan hiu kejen di perairan Samudera Hindia bagian Selatan Nusa Tenggara. Penelitian dilakukan di Tempat Pendaratan Ikan Tanjungluar, Lombok Timur tahun 2016. Pengukuran contoh hiu meliputi panjang total tubuh, nisbah kelamin serta panjang klasper. Hasil penelitian terhadap 3002 ekor ikan contoh menunjukkan bahwa kisaran panjang total hiu kejen (Carcharhinus falciformis) antara 65-300 cm (betina) dan 74-315 cm (jantan). Rerata ukuran panjang total adalah 187,66 cm (betina) dan 195 cm (jantan). Parameter pertumbuhan menurut Von Bertalanffy, meliputi laju pertumbuhan (K), panjang asimptotik (L) dan umur ikan pada saat panjang ke-0 (t0), masing-masing sebesar 0,42/tahun; 331,28 cmTL dan -0,20/ tahun. Persamaan kurva pertumbuhan von Bertalanffy untuk hiu kejen yaitu Lt = 331,28[1–e–0.,42(t+0.20)]. Parameter mortalitas hiu kejen meliputi laju kematian total (Z), laju kematian alamiah (M) dan laju kematian karena penangkapan (F) masing-masing sebesar 2,79/tahun; 0,49/tahun dan 2,30/tahun. Laju eksploitasi (E) hiu kejen sebesar 0,82 menandakan eksploitasi terhadap spesies ini cenderung sudah tinggi.Silky shark (Carcharhinus falciformis) is one of the family Carcharhinidae that commonly caught in the Indian Ocean South of Java. The purpose of this study was to obtain information on the populations parameters of silky shark caught in the waters of Indian Ocean Southern part of Nusa Tenggara. The study was conducted at fish landing sites in Tanjungluar, East Lombok from January to December 2016. The method used in this research was survey method. Observations included total body length, sex ratio and clasper length measured with direct measurements and visual observations in the field. From a total 3002 fish samples showed that the total length range for silky shark (Carcharhinus falciformis) caught in the waters of the Indian Ocean landed in Tanjungluar were between 65-300 cm TL (female) and 74-315 cmTL (male), with the average length of 187, 66 cmTL (female) and 195 cm TL (male). The estimated Von Bertalanffy growth parameters of length infinity (L), growth rate (K) and theoretical age of fish at zero length (t0) were 331.28 cmTL, 0.42 / year and -0.20 years, respectively. The Von Bertalanffy growth equation for silky shark was Lt = 331.28 [1-e-0.42(t+0.20)]. The calculated Parameters for silky shark mortality including total mortality rate (Z), the natural mortality rate (M) and the fishing mortality rate (F) were 2.79 / year, 0:49 / year and 2.30 / year, respectively. The exploitation rate (E) of silky shark of 0.82 indicates the exploitation of this species has already high.

Seasonal migrations of pregnant blue shark Prionace glauca in the northwestern Pacific

2020 ◽  
Author(s):  
Y Fujinami ◽  
K Shiozaki ◽  
Y Hiraoka ◽  
Y Semba ◽  
S Ohshimo ◽  
...  
Keyword(s):  
Northwestern Pacific ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Seasonal Migrations
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