| nematodes of elasmobranch fishes from the southern coast of brazil. | new records for nematode species recovered from elasmobranch fishes in brazil are established and new systematical arrangements proposed. parascarophis sphyrnae campana-rouget, 1955 from the spiral valve of sphyrna zygaena is referred for the first time in south america as a new host record. procamallanus (s.) pereirai annereaux, 1946, from the spiral valve of raja castelnaui is reported parasitizing an elasmobranch host. nematode larvae of the genera anisakis, contracaecum, pseudoterranova and ... | 2001 | 11285478 |
| redescriptions and new records of species of otobothrium linton, 1890 (cestoda: trypanorhyncha). | redescriptions are provided for five incompletely described species of otobothrium linton, 1890: otobothrium alexanderi palm, 2004 from two species of carcharhinid sharks, carcharhinus cautus (whitley) and c. melanopterus (quoy & gaimard) at three localities off northern australia; o. australe palm, 2004 based on material collected from the type-host and type-locality and from six additional myliobatid and carcharhinid host species off western australia, the northern territory and northern queen ... | 2013 | 23263940 |
| feeding ecology and trophic comparisons of six shark species in a coastal ecosystem off southern brazil. | the diets of six shark species, sphyrna lewini, sphyrna zygaena, carcharhinus obscurus, carcharhinus limbatus, rhizoprionodon lalandii and galeocerdo cuvier, were investigated in a subtropical coastal ecosystem of southern brazil. stomach content data were obtained to assess foraging niche segregation and ontogenetic shifts in the diets of these sharks. five of the shark species off the paraná coast were ichthyophagous, with the exception of s. zygaena, which was teutophagous. with the exception ... | 2014 | 24919949 |
| a comparison of the heart and muscle total lipid and fatty acid profiles of nine large shark species from the east coast of south africa. | we have assessed the fatty acid profiles of the hearts and different muscle tissues from nine large shark species (carcharhinus limbatus (blacktip), carcharhinus obscurus (dusky), carcharhinus brevipinna (spinner), carcharhinus leucas (zambezi/bull), galeocerdo cuvier (tiger), sphyrna lewini (scalloped hammerhead), sphyrna zygaena (smooth hammerhead), carcharodon carcharias (great white) and carcharias taurus (raggedtooth/grey nurse/sand tiger)) found off the east coast of south africa. while th ... | 2011 | 20694746 |
| big catch, little sharks: insight into peruvian small-scale longline fisheries. | shark take, driven by vast demand for meat and fins, is increasing. we set out to gain insights into the impact of small-scale longline fisheries in peru. onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from ilo, southern peru. fishing effort is divided into two seasons: targeting dolphinfish (coryphaena hippurus; december to february) and sharks (march to november). a total of 16,610 sharks were observed caught, with 11,166 identifie ... | 2014 | 25360274 |
| [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 |
| Bioaccumulation and Biomagnification of Total Mercury in Four Exploited Shark Species in the Baja California Peninsula, Mexico. | The present study determined the average mercury bioaccumulation in the muscle tissue of four shark species (Carcharhinus falciformis, Prionace glauca, Sphyrna zygaena and Isurus oxyrinchus) captured in the Baja California Peninsula. We also evaluated biomagnification of some prey consumed by sharks. All sharks' species had mercury levels over the limit specified by the Mexican government for human consumption. Blue shark (P. glauca) presented highest mercury values (1.96 ± 1.48 µg/g Hg d.w.) an ... | 2011 | 22187022 |
| superoxide production, oxidative damage and enzymatic antioxidant defenses in shark skeletal muscle. | pelagic sharks, unlike teleost fish, require constant active swimming to obtain a suitable oxygen (o(2)) supply. an increase in o(2) consumption during exercise enhances production of reactive oxygen species (ros). we hypothesized that shark species that display vigorous exercise, such as isurus oxyrinchus and carcharhinus falciformis, have higher ros production and, in consequence, higher antioxidant enzyme activities in muscle in comparison with species with less active swimming, like sphyrna ... | 2010 | 20060057 |
| the taxonomy of some poecilacanthoidea (eucestoda: trypanorhyncha) from elasmobranchs off the southern coast of brazil. | specimens of elasmobranchs, collected in the state of santa catarina, brazil, were parasitized with poecilacanthoidea trypanorhynch cestodes. sharks of the species prionace glauca harboured callitetrarhynchus gracilis and floriceps saccatus, and those of the species sphyrna zygaena were infected with callitetrarhynchus speciosus. details of the proglottids of f. saccatus, provided by bright-field, and/or scanning electron microscopy, are described. adults of f. saccatus are reported for the firs ... | 2006 | 16923274 |
| taxonomic reports of homeacanthoidea (eucestoda: trypanorhyncha) in lamnid and sphyrnid elasmobranchs collected off the coast of santa catarina, brazil. | elasmobranch specimens of lamnid and sphyrnid captured in 1999 in the state of santa catarina, brazil, were parasitized with homeacanthoid trypanorhynch cestodes: isurus oxyrinchus rafinesque, 1810 with nybelinia lingualis (cuvier, 1817) dollfus, 1929; sphyrna zygaena (linnaeus, 1758) with heteronybelinia rougetcampanae (dollfus, 1960) palm, 1999. new details of internal morphology and/or scolex and/or proglottid surface ultrastructure are given. adults of n. lingualis are reported for the first ... | 2005 | 15828577 |
| digenea and acanthocephala of elasmobranch fishes from the southern coast of brazil. | new records for helminth species recovered from elasmobranch fishes in brazil are established. digenean and acanthocephalan parasites of elasmobranch fishes are reported from the southern coast of brazil: otodistomum veliporum (creplin, 1837) stafford, 1904 (digenea: azygiidae) in the stomach and spiral valve of dipturus trachydermus and in the spiral valve of squatina sp. cystacanths and juveniles of the acanthocephalans corynosoma australe johnston, 1937 and corynosoma sp., in the spiral valve ... | 2001 | 11784929 |