| identification of factors influencing shark catch and mortality in the marshall islands tuna longline fishery and management implications. | recent average annual catches of sharks by tuna longline vessels fishing in the republic of the marshall islands (rmi) are estimated to be between 1583 and 2274 t. although 22 shark species have been recorded by the observer programme for this fishery, 80% of the annual catch comprises only five species: blue shark prionace glauca, silky shark carcharhinus falciformis, bigeye thresher shark alopias superciliosus, pelagic thresher shark alopias pelagicus and oceanic whitetip shark carcharhinus lo ... | 2012 | 22497410 |
| [fishery of oceanic and coastal sharks in colima, jalisco and michoacán]. | shark fishery is one of the most important activities in the mexican pacific coast, nevertheless, there is few data available about the specific captures done by the fleet along the coast. this study describes fishery biology aspects of the shark species catched by the semi-industrial long-line fleet of manzanillo. monthly samplings were made on board of these vessels during an annual period from april 2006 to april 2007. captured species composition (n = 1 962 organisms) was represented by nine ... | 2011 | 21721232 |
| microsatellite loci in the tiger shark and cross-species amplification using pyrosequencing technology. | the tiger shark (galeocerdo cuvier) has a global distribution in tropical and warm temperate seas, and it is caught in numerous fisheries worldwide, mainly as bycatch. it is currently assessed as near threatened by the international union for conservation of nature (iucn) red list. in this study, we identified nine microsatellite loci through next generation sequencing (454 pyrosequencing) using 29 samples from the western atlantic. the genetic diversity of these loci were assessed and revealed ... | 2016 | 27635306 |
| into the deep: the functionality of mesopelagic excursions by an oceanic apex predator. | comprehension of ecological processes in marine animals requires information regarding dynamic vertical habitat use. while many pelagic predators primarily associate with epipelagic waters, some species routinely dive beyond the deep scattering layer. actuation for exploiting these aphotic habitats remains largely unknown. recent telemetry data from oceanic whitetip sharks (carcharhinus longimanus) in the atlantic show a strong association with warm waters (>20°c) less than 200 m. yet, individua ... | 2016 | 27551383 |
| structure and genetic variability of the oceanic whitetip shark, carcharhinus longimanus, determined using mitochondrial dna. | information regarding population structure and genetic connectivity is an important contribution when establishing conservation strategies to manage threatened species. the oceanic whitetip shark, carcharhinus longimanus, is a highly migratory, large-bodied, pelagic shark listed by the iucn (international union for conservation of nature) red list as "vulnerable" throughout its range and "critically endangered" in the western north atlantic. in 2014, the species was protected globally under appe ... | 2016 | 27187497 |
| a novel mini-dna barcoding assay to identify processed fins from internationally protected shark species. | there is a growing need to identify shark products in trade, in part due to the recent listing of five commercially important species on the appendices of the convention on international trade in endangered species (cites; porbeagle, lamna nasus, oceanic whitetip, carcharhinus longimanus scalloped hammerhead, sphyrna lewini, smooth hammerhead, s. zygaena and great hammerhead s. mokarran) in addition to three species listed in the early part of this century (whale, rhincodon typus, basking, cetor ... | 2015 | 25646789 |
| the complete mitochondrial genome sequence of oceanic whitetip shark, carcharhinus longimanus (carcharhiniformes: carcharhinidae). | the complete mitochondrial dna sequence of carcharhinus longimanus was determined and analyzed. the complete mtdna genome sequence of c. longimanus was 16,706 bp in length. it contained 22 trna genes, 2 rrna genes, 13 protein-coding genes and 2 non-conding regions: control region (d-loop) and origin of light-strand replication (ol). the complete mitogenome sequence information of c. longimanus can provide a useful data for further studies on molecular systematics, stock evaluation, taxonomic sta ... | 2016 | 25264845 |
| complex movements, philopatry and expanded depth range of a severely threatened pelagic shark, the oceanic whitetip (carcharhinus longimanus) in the western north atlantic. | oceanic whitetip sharks (carcharhinus longimanus) have recently been targeted for conservation in the western north atlantic following severe declines in abundance. pop-up satellite archival tags were applied to 11 mature oceanic whitetips (10 females, 1 male) near cat island in the central bahamas 1-8 may 2011 to provide information about the horizontal and vertical movements of this species. another large female was opportunistically tagged in the u.s. exclusive economic zone (eez). data from ... | 2013 | 23437180 |
| population trends in pacific oceanic sharks and the utility of regulations on shark finning. | accurate assessment of shark population status is essential for conservation but is often constrained by limited and unreliable data. to provide a basis for improved management of shark resources, we analyzed a long-term record of species-specific catches, sizes, and sexes of sharks collected by onboard observers in the western and central pacific ocean from 1995 to 2010. using generalized linear models, we estimated population-status indicators on the basis of catch rate and biological indicato ... | 2013 | 23110546 |
| disculiceps galapagoensis n. sp. (lecanicephalidea: disculicepitidae) from the shark, carcharhinus longimanus, with comments on d. pileatus. | disculiceps galapagoensis n. sp. from the spiral valve of an oceanic whitetip shark, carcharhinus longimanus, collected near the galapagos rift is described and figured. it differs from d. pileatus (linton, 1891) joyeux and baer, 1935, the only other species currently recognized in the genus, as follows: the collar is much wider in proportion to the cushion, the cushion tapers gradually to meet the collar rather than meeting it abruptly, and the vas deferens is much less extensive and convoluted ... | 1988 | 3357097 |
| [composition of the carbohydrate component and fatty acids of the chief gangliosides of the brains of cartilaginous fish]. | ganglioside composition has been studied in the brain of 5 elasmobranch fishes (3 sharks: carcharhinus longimanus, carcharhinus sp., squalus acanthias and 2 rays: dasyatis pastinaca, raja clavata). for the identification of ganglioside fractions, molar ratio of glucose, galactose, nana and sphingosine as well as the presence of hexosamine were determined in the main gangliosides from the brain of the shark c. longimanus. the data obtained indicate that the majority of brain gangliosides in elasm ... | 2008 | 941546 |