scholarly journals Presencia de neonatos y juveniles del tiburón martillo Sphyrna lewini (Griffith & Smith, 1834) y del tiburón sedoso Carcharhinus falciformis (Müller & Henle, 1839) en la costa de Oaxaca, México

2007 ◽  
Vol 42 (3) ◽  
Author(s):  
Carmen Alejo-Plata ◽  
José L Gómez-Márquez ◽  
Samuel Ramos ◽  
Eduardo Herrera
Keyword(s):  
Sphyrna Lewini ◽  
Carcharhinus Falciformis

scholarly journals Elasmobrânquios capturados pela pesca artesanal na costa sul do Paraná e norte de Santa Catarina, Brasil

2006 ◽  
Vol 6 (3) ◽  
Author(s):  
Luciano Costa ◽  
Paulo de Tarso da Cunha Chaves
Keyword(s):  
Santa Catarina ◽  
Sphyrna Lewini ◽  
Galeocerdo Cuvier ◽  
Rhinoptera Bonasus ◽  
Carcharhinus Falciformis

O presente estudo foi realizado no litoral entre a divisa dos Estados do Paraná e Santa Catarina, em duas comunidades pesqueiras artesanais que integram os municípios de Guaratuba (PR) e Itapoá (SC). Foram acompanhadas as atividades pesqueiras das comunidades, entre julho de 2001 e março de 2003, com o objetivo de: listar as espécies de elasmobrânquios capturadas pelas comunidades em questão; avaliar o uso comercial das espécies; observar a ocorrência sazonal das espécies nos desembarques; estimar a freqüência relativa de captura por aparelho de pesca; e inferir sobre a biologia reprodutiva das espécies. Durante o período estudado foram capturados: Carcharhinus falciformis, Galeocerdo cuvier, Rhizoprionodon lalandii, R. porosus, Sphyrna lewini, S. zygaena, Squatina guggenheim, Narcine brasiliensis, Rhinobatos percellens, Zapteryx brevirostris, Rioraja agassizii, Dasyatis americana, D. guttata, D. hipostigma, Gymnura altavela, Myliobatis goodei, Rhinoptera bonasus e R. brasiliensis. Quanto à comercialização das espécies, foi observado que todos os tubarões capturados na área de estudo são comercializados, dentre as raias, apenas Rhinobatos percellens e Zapteryx brevirostris. Nos desembarques, a ocorrência de elasmobrânquios foi maior durante o inverno e a primavera. A maioria das capturas ocorreu com redes de emalhe, o arrasto camaroneiro pouco capturou. Os dados do presente trabalho indicaram a utilização da área estudada para o parto das espécies G. cuvier, R. lalandii, R. porosus, S. lewini, N. brasiliensis e R. agassizii; para o crescimento de todas as espécies amostradas; e para a gestação de R. percellens e Z. brevirostris. É sugerido que medidas que visem a proteger as espécies sejam tomadas, sem trazer prejuízos e conflitos para as comunidades de pescadores.

scholarly journals Mercurio en tiburón Sphyrna lewini y Carcharhinus falciformis del pací­fico guatemalteco

2017 ◽  
Vol 3 (2) ◽  
pp. 109-114
Author(s):  
Eduardo E. Chacón ◽  
Adrián M. Castro ◽  
Alva J. Montiel ◽  
Juan M. Tejeda ◽  
Gustavo Adolfo Elí­as Ogaldez
Keyword(s):  
Sphyrna Lewini ◽  
Carcharhinus Falciformis

El objetivo del estudio fue determinar la presencia de mercurio en muestras de carne de dos especies de tiburón: Sphyrna lewini y Carcharhinus falciformis, acopiados por la pesca artesanal en dos puntos de la costa pací­fica de Guatemala. Con el análisis de la información se verificó el estado de inocuidad de los organismos respecto a las concentraciones de mercurio, utilizando como base la normativa europea. Se recolectaron 66 muestras, durante 10 meses, las cuales fueron analizadas utilizando la técnica de espectrofotometrí­a de absorción atómica. Posteriormente se realizó un análisis descriptivo y se aplicó la ecuación del índice de Peligro Sistémico (IP). El análisis de resultados indicó que 16 (73%) organismos de S. lewini, presentaron concentraciones de mercurio superiores al lí­mite máximo permisible (LMP) de acuerdo a la normativa europea (1 mg/kg de peso fresco), aunque el IP (1.626857143 x 10 -4 ) demostró que no existe riesgo potencial para la salud de los consumidores, además que esta especie no muestra correlación significativa (ρ = 0.292), entre el tamaño del organismos y la concentración de mercurio. íšnicamente 4 (9%) organismos de la especie C. falciformis, presentaron concentraciones de mercurio arriba del lí­mite máximo permisible de acuerdo a la normativa europea, y el cálculo de IP (4.345714286 x 10 -5 ), indicó que el músculo de dicha especie puede consumirse sin ningún riesgo potencial para las personas.

scholarly journals SIZE, SEX AND LENGTH AT MATURITY OF FOUR COMMON SHARKS CAUGHT FROM WESTERN INDONESIA

2007 ◽  
Vol 32 (1) ◽  
pp. 7-19 ◽  
Author(s):  
Fahmi ◽  
Kurnaen Sumadhiharga
Keyword(s):  
Conservation Status ◽  
Shark Species ◽  
Sex Composition ◽  
Sphyrna Lewini ◽  
Scalloped Hammerhead ◽  
Landing Sites ◽  
Silky Shark ◽  
Carcharhinus Falciformis

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 length at maturity. In general, they were caught at size smaller than their maturity size. The proportion of immature C. brevipinna, C. falciformis, C. sorrah and S. lewini to their total number recorded at the surveyed area during the study were about 87%, 50%, 80% and 65%, respectively. According to the length at maturity, females generally attained their maturity in larger size than males. Some factors contributing the catches in immature size and conservation status of those four species were also discussed.

scholarly journals Trophic inference in two sympatric sharks, Sphyrna lewini and Carcharhinus falciformis (Elasmobranchii: Carcharhiniformes), based on stable isotope analysis at Malpelo Island, Colombia

2017 ◽  
Vol 47 (4) ◽  
pp. 357-364 ◽  
Author(s):  
Colombo Estupiñán-Montaño ◽  
Felipe Galván-Magaña ◽  
Elena Tamburin ◽  
Alberto Sánchez-González ◽  
Daniel Villalobos-Ramírez ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Sphyrna Lewini ◽  
Carcharhinus Falciformis ◽  
Malpelo Island

scholarly journals Autentikasi Produk Olahan Ikan Hiu Komersial menggunakan Teknik Species-Specific DNA Mini-barcodes.

2020 ◽  
Vol 23 (2) ◽  
pp. 383-391
Author(s):  
Asadatun Abdullah ◽  
Ari Elisa Ratih ◽  
Shabrina Aulia ◽  
Puji Rianti ◽  
Tati Nurhayati ◽  
...  
Keyword(s):  
Sphyrna Lewini ◽  
Carcharhinus Falciformis ◽  
Species Specific

Pemanfaatan ikan hiu sebagai bahan baku produk olahan perikanan dapat menyebabkan berkurangnya populasi ikan hiu yang juga rentan akan kepunahan. Ikan hiu pada umumnya diperdagangkan dalam bentuk sirip, daging ikan yang diasinkan dan direbus, minyak ikan serta sebagai bahan subtitusi pada pakan hewan sehingga proses identifikasi menggunakan metode berbasis morfologi dan meristik sulit dilakukan. Sebagai alternatif proses autentikasi bahan baku produk olahan ikan hiu adalah menggunakan teknik DNA mini barcodes. Penelitian ini bertujuan untuk merancang dan mengaplikasikan primer DNA mini barcodes yang spesifik terhadap tiga species hiu terancam punah yang masuk dalam daftar CITES (Sphyrna lewini, Alopias pelagicus, Carcharhinus falciformis) serta mengaplikasikan pada berbagai produk olahan ikan hiu. Tahapan penelitian yang dilakukan meliputi koleksi sampel produk olahan perikanan, perancangan primer spesifik, isolasi DNA, pengujian kualitas dan kuantitas DNA, amplifikasi DNA, dan sekuensing. Berbagai produk olahan komersial berhasil diamplifikasi oleh primer spesifik yaitu pada target 300 pb (S. lewini), 285 pb (A. pelagicus) dan 352 pb (C. falciformes). Hasil sekuensing DNA sampel menunjukkan bahwa spesies teridentifikasi adalah S. lewini, A. pelagicus, C. falciformes dan Hemigaleus microstoma dengan kemiripan 99-100%. Hal tersebut menunjukkan bahwa masih terdapatnya pemanfaatan ikan hiu yang dilindungi secara ilegal, sehingga perlu penerapan regulasi yang lebih ketat untuk melestarikan spesies-spesies hiu yang terancam kepunahannya.

Diet comparison between silky sharks (Carcharhinus falciformis) and scalloped hammerhead sharks (Sphyrna lewini) off the south-west coast of Mexico

2016 ◽  
Vol 97 (2) ◽  
pp. 337-345 ◽  
Author(s):  
Isaac Antonio Flores-Martínez ◽  
Yassir Edén Torres-Rojas ◽  
Felipe Galván-Magaña ◽  
Julia Ramos-Miranda
Keyword(s):  
West Coast ◽  
Trophic Levels ◽  
Ecological Network ◽  
The South ◽  
Sphyrna Lewini ◽  
Scalloped Hammerhead ◽  
South West ◽  
South West Coast ◽  
Carcharhinus Falciformis ◽  
Hammerhead Sharks

Ecologists examine diet composition in order to assess the spatial and temporal variations in interactions between species, the impact of different species traits on the ecological network structure, and the long-term effects of the removal of different species by small-scale fisheries. In this study, our goal was to compare the diets of silky sharks (Carcharhinus falciformis) and scalloped hammerhead sharks (Sphyrna lewini) off the south-west coast of Mexico in order to infer their diet preferences and spatial distributions. We sampled 164 S. lewini (96 stomachs had food, 68 were empty) and 183 C. falciformis (30 stomachs had food, 153 were empty) in Puerto Madero, Chiapas in 2011. The large number of empty stomachs may be the result of using longline fishing gear, which causes high stress resulting in regurgitation. Based on the index of relative importance (%IRI), the fish Chloroscombrus orqueta (IIR = 27.7%) was the most important species in the diet of S. lewini, while the squid Dosidicus gigas (IIR = 34%) was the primary prey of C. falciformis. Levin's index (Bi) and Shannon's index (H′) confirm that both sharks are generalists, as in other regions. The trophic levels of S. lewini (TL = 4.1) and C. falciformis (TL = 4.2) are characteristic of tertiary consumers; meanwhile, the Morisita–Horn index indicates low interspecific overlap between all categories. These results confirm that these two sharks have different foraging preferences or movement patterns; thus, there is no trophic overlap between species as they play unique roles in the ecological network off the south-west coast of Mexico.

scholarly journals Jenis, performa, dan nisbah kelamin ikan hiu yang didaratkan di Pelabuhan Perikanan Samudra Cilacap

2018 ◽  
Vol 17 (2) ◽  
pp. 185 ◽  
Author(s):  
Dian Bhagawati ◽  
Tri Nurani ◽  
Muh. Nadjmi Abulias
Keyword(s):  
Conservation Status ◽  
Sampling Technique ◽  
Total Body Length ◽  
Species Number ◽  
Shark Species ◽  
Female Fish ◽  
Sphyrna Lewini ◽  
Isurus Oxyrinchus ◽  
Carcharhinus Falciformis ◽  
Total Body

Shark fisheries in Indonesia are still relying on the natural catch. Several shark species are important fisheries commo-dities and are highly collected. Although there are several rules to control catch, usage, and conservation status, in practice, fishermen are less submissive. This study was conducted to obtain information about species diversity, per-formance, and sex ratio of sharks which were found in Cilacap Port in October to November 2015. The method used was purposive random sampling technique. Samples were taken four times with two weeks interval for each observation. The parameters were species number, total body length, body weight, morphometry and sex. Data were analyzed descriptively. Thirty six sharks were recorded during the sampling which consisted of 14 species. Among 36 individuals, 7 individuals were juveniles, 3 individuals were adolescence, and 26 individuals were adults. Alopias superciliosus (321 cm) was the longest species, while the shortest was Sphyrna lewini (59 cm); Isurus oxyrinchus was the heaviest (100 kg) species and the lightest species was Carcharhinus falciformis (1 kg). In general, female fish were obtained more than the males. AbstrakProduksi ikan hiu di Indonesia masih mengandalkan hasil tangkapan dari alam. Meskipun sudah terdapat beberapa per-aturan yang mengatur tentang penangkapan, pemanfaatan dan status perlindungannya, namun dalam prakteknya kurang dipatuhi. Penelitian ini dilakukan untuk mendapatkan informasi tentang keragaman spesies, performa, dan nisbah kela-min ikan hiu yang didaratkan di Pelabuhan Perikanan Samudra Cilacap pada periode Oktober sampai dengan November 2015. Sampel dipilih dengan persyaratan tertentu dan identifikasi dengan teknik photo ID (Photo-Identiûcation). Para-meter yang diamati adalah jumlah jenis, panjang total, bobot tubuh, morfometrik, dan jenis kelamin. Data yang diper-oleh dianalisis secara deskriptif. Selama pengambilan sampel diperoleh 36 ekor ikan hiu, yang terdiri atas 14 jenis, dan tergolong yuwana sebanyak 7 ekor, 3 remaja, dan 26 dewasa. Ikan yang tertangkap dan memiliki ukuran tubuh terpan-jang adalah Alopias superciliosus (321cm), terpendek Sphyrna lewini (59cm); terberat Isurus oxyrinchus (100kg) dan teringan adalah Carcharhinus falciformis (1kg). Secara umum ikan betina lebih banyak tertangkap daripada ikan jantan.

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
Sign in / Sign up

Export Citation Format

Share Document