163 research outputs found

    Chondrichthyan fauna from the Pirabas Formation, Miocene of Northern Brazil, with comments on paleobiogeography

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    The chondrichthyan fauna from the Pirabas Formation is redescribed.Only thirteen nominal taxa are considered valid. From these taxa, ten were reassigned to extant taxa (Carcharhinus sorrah, Carcharhinus perezii,Galeocerdo cuvier, Rhizoprionodon lalandii, Sphyrna sp., Hemipristis elongatus, Carcharodon carcharias, Isurus oxyrinchus, Nebrius ferrugineus, and indeterminate Myliobatidae), confirming the Neogene age of this formation. This elasmofauna is compared with other Caribbean and African Tertiary faunas.A fauna de Chondrichthyes da Forma√ß√£o Pirabas √© redescrita no presente trabalho. Apenas treze taxa nominais s√£o considerados como v√°lidos.Desses taxa, dez foram considerados como ainda viventes (Carcharhinus sorrah, Carcharhinus perezii, Galeocerdo cuvier, Rhizoprionodon lalandii, Sphyrna sp., Hemipristis elongatus, Carcharodon carcharias, Isurus oxyrinchus, Nebrius ferrugineus, Myliobatidae), confirmando a idade Neog√™nica desta forma√ß√£o. Essa elasmofauna √© comparada com as faunas do Terci√°rio do Caribe e da √Āfrica

    Pemanfaatan Sumber Daya Ikan Hiu dan Pari Secara Tradisional oleh Masyarakat Pesisir Papua Barat

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    Ikan hiu dan pari adalah komoditas perikanan penting di dunia dan memiliki peranan baik secara ekologi maupun ekonomis. Tujuan penelitian ini adalah mengetahui jenis-jenis sumber daya hiu dan pari yang dimanfaatkan secara tradisonal oleh masyarakat di Kabupaten Sorong Selatan dan Kabupaten Teluk Bintuni Provinsi Papua Barat. Penelitian ini bersifat eksploratif dan menggunakan pendekatan kualitatif dengan metode deskriptif. Data yang dikumpulkan berupa data primer dan sekunder. Data primer dikumpulkan melalui pengamatan dan wawancara langsung di lapangan. Berdasarkan hasil penelitian ditemukan bahwa jenis ikan hiu dan pari yang dimanfaatkan oleh masyarakat di Kabupaten Bintuni dan Sorong Selatan adalah 16 jenis. Status dari masing-masing jenis berbeda, yaitu 3 jenis masuk dalam kategori Vurnarable (Sphyrna sp, Aetobatus ocellatus dan Rhinoptera javanica), satu spesies masuk kategori Endangered (Eusphyra blochii) serta 5 jenis masuk dalam kategori Critically Endangered. Pemanfaatan ikan hiu dan pari oleh masyarakat pesisir/nelayan di Kabupaten Sorong Selatan dan Kabupaten Bintuni berada dalam kategori pemanfaatan secara tradisional yaitu berupa produk olahan berupa daging ikan garam/asin dan dendeng. Sumber daya ikan hiu dan pari bukanlah target tangkapan masyarakat tetapi merupakan bycatch yang kemudian diolah secara tradisional. Kurangnya pengetahuan masyarakat tentang pentingnya menjaga sebuah sumber daya yang memiliki status perlindungan akan menyebabkan penangkapan dilakukan secara terus menerus pada jenis-jenis yang berstatus vulnerable (terancam punah) atau spesies yang dilindungi. Hal ini dibuktikan bahwa nilai nilai korelasi antara tingkat pemanfaatan dengan pengetahuan masyarakat tentang sumber daya ikan hiu dan pari rendah yaitu korelasi (r) sebesar 0.56. Title: Traditional Utilization of Shark and Ray Resources by Coastal Community of West Papua Sharks and rays are essential fishery commodities in the world and have a role both ecologically and economically. This study aimed to determine the types of shark and ray resources used and the traditional pattern of utilization by the people in South Sorong Regency and Teluk Bintuni Regency, West Papua Province. This research method is an exploratory and qualitative approach with a descriptive method. The data was collected in the form of primary and secondary data. Primary data were collected through direct observation and interviews in the field. The findings show that there are 16 species of sharks and rays caught by the community in Bintuni Bay and South Sorong Regencies. Each species’ status is different and can be defined as three species in the vulnerable (Sphyrna sp, Aetobatus ocellatus and Rhinoptera javanica), one as Endangered species (Eusphyra blochii), and five species in the Critically Endangered species. The utilization of sharks and rays by coastal communities/fishers in South Sorong Regency and Bintuni Regency is still in the category of traditional use, namely in the form of processed products in the form of smoked fish meat, salt/salted fish, and beef jerky. The level of traditional utilization of shark and ray resources by the local community in South Sorong Regency and Bintuni Regency is relatively high due to the lack of knowledge of local communities about the status of these fishery resources, which have been used traditionally. Furthermore, this can also indicate that lack of public knowledge about the importance of maintaining a protected resource will then continue the effort to catch the vulnerable (endangered) or protected species. It is proven that the correlation value between the utilization rate and public knowledge about shark and ray resources is low, namely a correlation (r) of 0.56

    La ictiofauna

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    La composici√≥ espec√≠fica de la fauna ictiol√≤gica de l'Arxip√®lag de Cabrera no presenta difer√®ncies significatives respecte a la de la resta de les Balears. Aquest treball es composa d'una llista exhaustiva dels peixos coneguts fins al moment a Cabrera, amb 218 esp√®cies litorals o de plataforma, i d'un cap√≠tol de comentaris a les esp√®cies m√©s interessants, destacant la confirmaci√≥ de la pres√®ncia de Serranus atricauda a Balears i primera referencia a Mallorca, la primera cita de Gobius vittatus a aig√ľes ib√®riques, la primera cita a Balears de Pomadasys incisus i la primera refer√®ncia a Mallorca de Diplodus cervinus. A l'annex s'inclou una llista dels peixos ordenats pel tipus d'h√†bitat.The specific composition of the icthyologic fauna of Cabrera Archipelago does not appear to be significantly different from that of the rest of the Balearic Islands. The present study gives an exhaustive list of the fishes know to live in Cabrera, with 128 coastal or platform species and includes a section commenting on the most interesting ones. The presence of Serranus atricauda in the Balearic Islands and its first citation in Mallorca is confirmed. Gobius vittatus is first cited for Iberian waters. Pomadasys incisus is first cited for Mallorca. A list of fishes ranked by that type is also given

    Conhecimentos tradicionais de pescadores sobre popula√ß√Ķes de tubar√Ķes na Ilha de Santa Catarina, Sul do Brasil

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    TCC(gradua√ß√£o) - Universidade Federal de Santa Catarina. Centro de Ci√™ncias Biol√≥gicas. Biologia.A atividade humana nos oceanos apresenta n√≠veis de produ√ß√£o cada vez mais elevados, que ocasionam o fen√īmeno da sobrepesca e trazem hoje uma situa√ß√£o de colapso iminente. Os elasmobr√Ęnquios representam um dos grupos taxon√īmicos mais prejudicados, com altas taxas de decl√≠nio. Um potencializador desta situa√ß√£o est√° na estrat√©gia reprodutiva do grupo, que t√™m matura√ß√£o sexual tardia, poucos descendentes e crescimento lento. Soma-se a isto o com√©rcio de nadadeiras, popularmente conhecidas como barbatanas, que consiste na retirada destas do animal para sua comercializa√ß√£o, que mutila 38 dos 99 milh√Ķes de tubar√Ķes pescados anualmente. As percep√ß√Ķes dos sujeitos envolvidos na extra√ß√£o dos recursos pesqueiros podem ser abordadas a partir da Etnobiologia, ci√™ncia que estuda as rela√ß√Ķes das pessoas com o meio biol√≥gico que as circunda. Este di√°logo pode servir como ponte para o resgate de conhecimentos relativos ao tema. O presente trabalho buscou, sob uma perspectiva etnobiol√≥gica, registrar a percep√ß√£o das comunidades pesqueiras frente ao decl√≠nio de tubar√Ķes na regi√£o. A investiga√ß√£o ocorreu em seis comunidades pesqueiras na Ilha de Santa Catarina: P√Ęntano do Sul, Arma√ß√£o do P√Ęntano do Sul, Campeche, Barra da Lagoa, Ingleses e Ponta das Canas, onde foram aplicadas entrevistas semiestruturadas aos 22 pescadores considerados especialistas em captura de tubar√Ķes e dispostos a contribuir com a pesquisa. Obtivemos indicativos sobre mudan√ßas temporais nas popula√ß√Ķes de elasmobr√Ęnquios, com relatos de que h√° 30 anos, em m√©dia (¬Ī 12,3), as popula√ß√Ķes de tubar√Ķes eram mais abundantes na regi√£o e a sua pesca integrava a economia das comunidades estudadas. Foram registrados tamb√©m a nomenclatura tradicional das esp√©cies exploradas na regi√£o, os conhecimentos tradicionais sobre ciclos de vida e import√Ęncia ecol√≥gica, e as principais √°reas de ocorr√™ncia de elasmobr√Ęnquios da √°rea estudada. Como atividade de devolutiva √†s comunidades pesquisadas, foi elaborado uma publica√ß√£o ilustrada que conta com uma breve hist√≥ria das percep√ß√Ķes de cada localidade estudada, assim como um cat√°logo de esp√©cies de tubar√Ķes de Florian√≥polis com a nomenclatura tradicional e um mapeamento comparativo da presen√ßa de tubar√Ķes na ilha antigamente e na atualidade

    Sélaciens du Miocène terminal du bassin d'Alvalade (Portugal). Essai de synthèse

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    A rich uppermost Miocene selachian fauna from the Alvalade Basin (represented by more than 10.000 teeth) is accounted for. It is the most modern miocene fauna of neritic habit under warm-temperate to subtropical conditions, known in the european Miocene

    Migra√ß√Ķes na fase pel√°gica do Cherne, Polyprion americanus (Schneider, 1801), evidenciadas por marca√ß√£o e recaptura

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    Vários chernes juvenis, Polyprion americanus (Schneider. 1801) foram capturados à superfície da água e marcados em vários locais próximos das ilhas do Grupo Central dos Açores. Um dos exemplares foi recapturado 3 meses depois ter sido marcado, a 217 km do local onde tinha sido libertado e a uma profundidade de 254 m. A recaptura deste espécime indica que o cherne passa para uma vida demersal quando atinge um comprimento total de cerca de 50 cm.ABSTRACT: Pelagic juvenile wreckfish, Polyprion americanus (Schneider, 1801) were tagged in the surface waters around the Central Group of the Azores. One wreckfish was recaptured three months after tagging, and 217 km from its release point. It had settled to the bottom in 254 m of water. The recapture of this specimen suggests that wreckfish take up a demersal life at a total length of about 50 cm

    Miocene Shark and Batoid Fauna from Nosy Makamby (Mahajanga Basin, Northwestern Madagascar)

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    Assessment of the Distribution and Abundance of Coastal Sharks in the U.S. Gulf of Mexico and Eastern Seaboard, 1995 and 1996

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    During 1995 and 1996, the National Marine Fisheries Service (NMFS), conducted pilot studies to develop survey methodology and a sampling strategy for assessment of coastal shark populations in the Gulf of Mexico and western North Atlantic. Longline gear similar to that used in the commercial shark fishery was deployed at randomly selected stations within three depth strata per 60 nautical mile gridf rom Brownsville, Tex. to Cape Ann, Mass. The survey methodology and gear design used in these surveys proved effective for capturing many of the small and large coastal sharks regulated under the auspices of the 1993 Fisheries Management Plan (FMP) for Sharks oft he Atlantic Ocean. Shark catch rates, species composition, and relative abundance documented in these pilot surveys were similar to those reported from observer programs monitoring commercial activities. During 78 survey days, 269 bottom longline sets were completed with 879 sharks captured

    HASIL TANGKAPAN CUCUT YANG TERTANGKAP DENGAN JARING INSANG TUNA PERMUKAAN DI PERAIRAN SAMUDERA HINDIA

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    Penelitian ini dilakukan di lokasi pendaratan ikan utama Pelabuhan Perikanan Samudera Cilacap selama tahun 2006-2008. Tujuan penelitian ini untuk mengetahui fluktuasi catch per unit of effort, komposisi, dan fluktuasi hasil tangkapan cucut yang tertangkap dengan jaring insang tuna permukaan. Metode penelitian dengan pengamatan langsung di lapangan dan pengumpulan data hasil tangkapan oleh enumerator. Data hasil tangkapan cucut (Requiem shark sp.) diperoleh berdasarkan atas catatan harian dari sejumlah kapal yang menggunakan jaring insang tuna permukaan yang beroperasi di perairan Samudera Hindia selama tahun 2007 dan 2008 masing-masing 821 dan 791 unit. Hasil penelitian ini menunjukan telah terjadi indikasi penurunan catch per unit of effort cucut secara bulanan. Nilai catch per unit of effort tahun 2008 mulai menurun setelah bulan Juli sampai Desember, jika dibandingkan tahun 2007 pada periode yang sama (p<0,05). Komposisi hasil tangkapan cucut bervariasi secara bulanan berdasarkan atas spesies yang didominansi oleh Alopias pelagicus (59,4%) dan Alopias superciliosus (21,1%). Fluktuasi hasil tangkapan dari delapan spesies cucut menunjukan variasi yang hampir sama dan puncak hasil tangkapan terjadi pada bulan Juni dan Juli. This study has been conducted at major fish landing sites, Ocean Fishing Port of Cilacap during the period of 2006-2008. The aim of this research is to find out catch per unit of effort fluctuations, composition, and fluctuations of shark catches are caught by surface tuna gillnet. Research methods with direct observation and catch data collection by enumerator. Shark catch data obtained from daily records from 821 units in 2007 and 791 units in 2008 of the vessels surface tuna gillnet operating in the Indian Ocean. The results show there have been indications of a decrease shark catch per unit of effort based on a monthly (P<0,05). Catch per unit of effort values in 2008 began to decline after the month of July until December, when compared to the year 2007 in the same period. The composition of shark catches was vary monthly based on species that are dominated by Alopias pelagicus (59.4%), and Alopias superciliosus (21.1%). Catch fluctuation of the eight species of shark showed similar variations and peak catches occurred in June and July

    Effects of leader material on catches of shallow pelagic longline fisheries in the southwest Indian Ocean

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    Catches from a commercial longline fishery targeting swordfish (Xiphias gladius) on monofilament nylon leaders were compared with catches on wire leaders in the Indian Ocean. More taxa were caught on wire leaders, which also showed higher catch rates (13% and 56%, in number and weight, respectively) of blue shark (Prionace glauca). In contrast, catch rates of swordfish were not significantly affected by leader material. Nylon leaders showed lower at-haulback mortality for most bony fishes, except swordfish. Higher bite-off rates were observed on nylon monofilament, likely owing to the escape of species with sharp teeth, such as sharks. Both leader types caught most species within similar size ranges, but larger mean sizes of blue shark were recorded on wire leaders. The value per unit of effort (VPUE) of the retained catch did not differ between leader materials; however, VPUEs are highly dependent on market fluctuations. Banning wire leaders could be an effective way of reducing shark catches, particularly blue shark catches, in the southwest Indian Ocean.Programa Operacional das Pescas: LL-SHARKs - Ref 31- 03-05-FEP-44, FCT IF/00253/2014info:eu-repo/semantics/publishedVersio
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