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| Registros recuperados: 14 | |
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| Ellis, J. R.; Phillips, S. R. Mccully; Poisson, Francois. |
| There is a need to better understand the survivorship of discarded fishes, both for commercial stocks and species of conservation concern. Within European waters, the landing obligations that are currently being phased in as part of the European Union's reformed common fisheries policy means that an increasing number of fish stocks, with certain exceptions, should not be discarded unless it can be demonstrated that there is a high probability of survival. This study reviews the various approaches that have been used to examine the discard survival of elasmobranchs, both in terms of at-vessel mortality (AVM) and post-release mortality (PRM), with relevant findings summarized for both the main types of fishing gear used and by taxonomic group. Discard... |
| Tipo: Text |
Palavras-chave: Batoids; By-catch; Discards; Dogfish; Sharks; Survival. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00358/46902/46980.pdf |
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| Poisson, Francois; Seret, Bernard; Vernet, Anne-lise; Goujon, Michel; Dagorn, Laurent. |
| The reduction of by-catch mortality is an objective of the ecosystem approach to fisheries and a request made by consumers. Elasmobranchs, an important component of the French tropical tuna purse seine fishery by-catch, are currently thrown back into the sea. Fishers interact with various types of elasmobranchs that range widely in size, weight and shape, and could pose various degrees of danger to the crew. A diversity of discarding practices within the fleet were reported, some practices were considered suitable, others needed to be adapted and improved and others simply had to be banned. The majority of the crews were likely to improve their handling practices if they were presented with practical suggestions that were quick and easy. Combining... |
| Tipo: Text |
Palavras-chave: By-catch; Tropical purse-seiner; Sharks; Handling/release practices; Mitigation; Fish welfare. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00159/27008/28367.pdf |
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| de la Serna, J.M.; Valeiras, J.. |
| (Contribution to the biological study of blue shark (Prionace glauca) incidental catch by the Spanish surface longline fisheries for swordfish in the western Mediterranean). Blue shark (Prionace glauca) bycatches in the Spanish surface longline fisheries in the Mediterranean targeting swordfish (Xiphias gladius) from 1999 to 2001 represented 2% of the total catch. Information from onboard observers during 861 fishing sets in 26 longliners indicated that the highest catches were made in area 4-35000 (Alboran Sea) which represents 75.6% of the total observed catch of blue shark. The observed CPUE are from 5.5 to 34.1 kg/1000 hooks. Mean size at capture (LJFL) was 141.6 cm (SD=35.88). The proportion of females from the total was 0.5. |
| Tipo: Report |
Palavras-chave: Swordfish fishery; Blue shark; By-catch; Mediterranean; Prionace glauca; Shark fisheries; Sharks. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/790 |
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| Pinhal,Danillo; Gadig,Otto BF; Wasko,Adriane P; Oliveira,Claudio; Ron,Ernesto; Foresti,Fausto; Martins,Cesar. |
| Sharks are suffering from intensive exploitation by worldwide fisheries leading to a severe decline in several populations in the last decades. The lack of biological data on a species-specific basis, associated with a k-strategist life history make it difficult to correctly manage and conserve these animals. The aim of the present study was to develop a DNA-based procedure to discriminate shark species by means of a rapid, low cost and easily applicable PCR analysis based on 5S rDNA repeat units amplification, in order to contribute conservation management of these animals. The generated agarose electrophoresis band patterns allowed to unequivocally distinguish eight shark species. The data showed for the first time that a simple PCR is able to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chondrichthyes; PCR; Species identification; 5S rDNA; Sharks. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200033 |
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| Rodrigues-Filho,Luis Fernando da Silva; Rocha,Tainá Carreira da; Rêgo,Péricles Sena do; Schneider,Horacio; Sampaio,Iracilda; Vallinoto,Marcelo. |
| The ongoing decline in abundance and diversity of shark stocks, primarily due to uncontrolled fishery exploitation, is a worldwide problem. An additional problem for the development of conservation and management programmes is the identification of species diversity within a given area, given the morphological similarities among shark species, and the typical disembarkation of processed carcasses which are almost impossible to differentiate. The main aim of the present study was to identify those shark species being exploited off northern Brazil, by using the 12S-16S molecular marker. For this, DNA sequences were obtained from 122 specimens collected on the docks and the fish market in Bragança, in the Brazilian state of Pará. We identified at least 11... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sharks; Molecular identification; Phylogenetic; MtDNA; Conservation. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200031 |
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| Nageon de Lestang, J.. |
| Shark species, both oceanic and coastal, are very common to Seychelle waters. In the past, however, the demand for shark and shark products has always been very erratic. The ever-increasing international concern for the species and potential conflicts between fishermen and conservation groups has highlighted the issue. In the Seychelles, the shark are caught by gillnets in inshore waters and by hook-and-line and purse seine offshore. Until very recently there were no regulations controlling the shark fishery, but, partly in response to initiatives by a local conservation group, fishing for sharks with nets has been banned since 1 August 1998. A review is provided of the present situation of the fishery whilst underscoring the difficulties of formulating a... |
| Tipo: Report |
Palavras-chave: Seychelles; SHARK FISHERIES; Fishery management; Fishery regulations; Legislation; Shark fisheries; Fishery management; Legislation; Sharks. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/1311 |
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| Mancusi, Cecilia; Baino, Romano; Fortuna, Corina; De Sola, Luis Gil; Morey, Gabriel; Bradai, Mohamed Nejmeddine; Kallianotis, Argyrios; Soldo, Alen; Hemida, Farid; Saad, Adib Ali; Dimech, Mark; Peristeraki, Panagiota; Bariche, Michel; Clò, Simona; De Sabata, Eleonora; Castellano, Laura; Garibaldi, Fulvio; Lanteri, Luca; Tinti, Fausto; Pais, Antonio; Sperone, Emilio; Micarelli, Primo; Poisson, Francois; Sion, Letizia; Carlucci, Roberto; Cebrian-menchero, Daniel; Séret, Bernard; Ferretti, Francesco; El-far, Alaa; Saygu, Ismet; Shakman, Esmail A.; Bartoli, Alex; Guallart, Javier; Damalas, Dimitrios; Megalofonou, Persefoni; Vacchi, Marino; Bottaro, Massimiliano; Notarbartolo Di Sciara, Giuseppe; Follesa, Maria Cristina; Cannas, Rita; Kabasakal, Hakan; Zava, Bruno; Cavlan, Graziella; Jung, Armelle; Abudaya, Mohammed; Kolitari, Jerina; Barash, Adi; Joksimovic, Aleksandar; Marčeta, Bojan; Gonzalez Vilas, Luis; Tiralongo, Francesco; Giovos, Ioannis; Bargnesi, Filippo; Lelli, Stefano; Barone, Monica; Moro, Stefano; Mazzoldi, Carlotta; Charis, Charilaou; Abella, Alvaro Juan; Serena, Fabrizio; Colloca, Francesco; Cetkovic, Ilija. |
| The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (more than 4000 individuals) of large elasmobranch species from 20 different countries around the Mediterranean and Black seas, observed from 1666 to 2017. The main species included in the archive are the devil fish (1 813 individuals), the basking shark (939 individuals), the blue shark (585 individuals) and the great white shark (337 individuals). In the last decades other species such as the shortfin mako (166 individuals), the spiny butterfly ray (138) and the thresher shark (174 individuals) were reported with an increasing frequency. This was possibly due to an increased public awareness on the conservation status of sharks, and a consequent development of... |
| Tipo: Text |
Palavras-chave: Bycatch; Databases; Geographical distribution; Large elasinobranchs; Mediterranean and Black seas; Sharks. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00649/76117/77080.pdf |
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| LACERDA,L. D.; PARAQUETTI,H. H. M.; MARINS,R. V.; REZENDE,C. E.; ZALMON,I .R.; GOMES,M. P.; FARIAS,V.. |
| We present here the first results of Hg concentrations in three small shark species (Rhizoprionodon lalandei, R. porosus and Mustelus higmani) from the SE Brazilian coast. Mercury concentrations in R. lalandei ranged from 21.5 to 280.0 ng.g-1 dry weight (d.w.) (average 74.6 ng.g-1 d.w.; 17.9 ng.g-1 wet weight). In R. porosus, concentrations ranged from 7.6 to 90.5 ng.g-1 d.w. (average 42.2 ng.g-1 d.w., 9.4 ng.g-1 wet weight), whereas in M. higmani, concentrations ranged from 13.0 to 162.8 ng.g-1 d.w. (average 54.9 ng.g-1 d.w., 13.4 ng.g-1 wet weight). These concentration ranges are very low compared with values reported for other large shark species of the Southwestern Atlantic Ocean. There was a significant positive correlation between Hg concentrations... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mercury; Sharks; Biomagnification; SE Brazil. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400005 |
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| Cresson, Pierre; Fabri, Marie-claire; Bouchoucha, Marc; Brach-papa, Christophe; Chavanon, Fabienne; Jadaud, Angelique; Knoery, Joel; Marco-miralles, Francoise; Cossa, D.. |
| Mercury (Hg) is a global threat for marine ecosystems, especially within the Mediterranean Sea. The concern is higher for deep-sea organisms, as the Hg concentration in their tissues is commonly high. To assess the influence of food supply at two trophic levels, total Hg concentrations and carbon and nitrogen stable isotope ratios were determined in 7 species (4 teleosts, 2 sharks, and 1 crustacean) sampled on the upper part of the continental slope of the Gulf of Lions (Northwestern Mediterranean Sea), at depths between 284 and 816 m. Mean Hg concentrations ranged from 1.30 ± 0.61 to 7.13 ± 7.09 μg g− 1 dry mass, with maximum values observed for small-spotted catshark Scyliorhinus canicula. For all species except blue whiting Micromesistius poutassou, Hg... |
| Tipo: Text |
Palavras-chave: Continental slope; Trophic webs; Depth; Teleosts; Sharks; Stable isotopes. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00206/31759/30693.pdf |
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| Raoult, Vincent; Trueman, Clive N; Kingsbury, Kelsey M; Gillanders, Bronwyn M; Broadhurst, Matt K; Williamson, Jane E; Nagelkerken, Ivan; Booth, David J; Peddemors, Victor; Couturier, Lydie Ir; Gaston, Troy F. |
| Determining the geographic range of widely dispersed or migratory marine organisms is notoriously difficult, often requiring considerable costs and typically extensive tagging or exploration programs. While these approaches are accurate and can reveal important information on the species, they are usually conducted on only a small number of individuals and can take years to produce relevant results, so alternative approaches may be preferable. The presence of latitudinal gradients in stable carbon isotope compositions of marine phytoplankton offers a means to quickly determine likely geographic population ranges of species that rely on productivity from these resources. Across sufficiently large spatial and temporal scales, the stable carbon isotopes of... |
| Tipo: Text |
Palavras-chave: Habitat range population distributions; Movement; Species distribution model; Sharks; Manta rays; Stable isotopes; Tracking; Isoscape. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00662/77363/78935.pdf |
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| Barria, Claudio; Coll, Marta; Navarro, Joan. |
| Deficiencies in basic ecological information on uncommon and endangered elasmobranch fishes impair the assessment of their ecological role in marine ecosystems. In this study, we examined the feeding ecology (diet composition and trophic level) and trophic relationships of 22 elasmobranchs (2 Carcharhiniformes, 1 Hexanchiformes, 1 Lamniformes, 3 Myliobatiformes, 6 Rajiformes, 6 Squaliformes and 3 Torpediniformes) present in the western Mediterranean Sea. To obtain a comprehensive view of the feeding ecology of these species, we combined different approaches: stable isotope analyses (delta C-13 and delta N-15 values), stomach content analyses and published sources. Our results revealed differences in feeding strategies among elasmobranch groups: skates... |
| Tipo: Text |
Palavras-chave: Mediterranean Sea; Rays; Sharks; Skates; Species at risk; Stable isotopes; Trophic ecology; Trophic level. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00626/73825/73409.pdf |
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| Navia,Andrés Felipe; Mejía-Falla,Paola Andrea; Hleap,José Sergio. |
| ABSTRACT In order to investigate zoogeographical patterns of the marine elasmobranch species of Colombia, species richness of the Pacific and Caribbean and their subareas (Coastal Pacific, Oceanic Pacific, Coastal Caribbean, Oceanic Caribbean) was analyzed. The areas shared 10 families, 10 genera and 16 species of sharks, and eight families, three genera and four species of batoids. Carcharhinidae had the highest contribution to shark richness, whereas Rajidae and Urotrygonidae had the greatest contribution to batoid richness in the Caribbean and Pacific, respectively. Most elasmobranchs were associated with benthic and coastal habitats. The similarity analysis allowed the identification of five groups of families, which characterize the elasmobranch... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Batoids; Beta diversity; Historical biogeography; Richness; Sharks; Vagility. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200215 |
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| Registros recuperados: 14 | |
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