| total mercury in muscle tissue of five shark species from brazilian offshore waters: effects of feeding habit, sex, and length. | this study was carried out to assess mercury levels in fish from brazilian offshore waters. generally sharks have relatively high mercury levels which are also affected by diet, age (associated with length), and sex. total mercury levels were determined in five shark species with different habits (carcharhinus signatus, mustelus canis, mustelus norrisi, squalus megalops, and squalus mitsukurii) which were collected during 1997 in southern brazil's offshore waters. the highest mercury concentrati ... | 2002 | 12176009 |
| antidiabetic effect of a new peptide from squalus mitsukurii liver (s-8300) in alloxan-diabetes. | 1. the purpose of the present study was to evaluate the antidiabetic effect of s-8300 in alloxan diabetic mice. 2. diabetes was induced by single intravenous injection of alloxan (60 mg/kg bodyweight). 3. the effects of s-8300 on diabetic mice were investigated by observing changes in the glycometabolic index (fasting plasma glucose, glycosylated haemoglobin), the lipometabolic index (triglyceride, cholesterol, free fatty acids), anti-oxidant index (superoxide dismutase, malondialdehyde) and in ... | 2005 | 16026509 |
| antidiabetic effect of a new peptide from squalus mitsukurii liver (s-8300) in streptozocin-induced diabetic mice. | we have evaluated the antidiabetic effect of s-8300 (a peptide extracted from shark liver (squalus mitsukurii)) in streptozocin (streptozotocin)-diabetic mice. diabetes was induced by a single intravenous injection of streptozocin (150 mg kg(-1)). the effects of s-8300 (3 or 10 mg kg(-1)) on diabetic mice were investigated by observing the changes in the levels of fasting plasma glucose, glycosylated haemoglobin, hepatic glycogen, triglycerides, cholesterol, free fatty acid, superoxide dismutase ... | 2005 | 16354401 |
| two new species of hexabothriid monogeneans from the ginzame chimaera phantasma and shortspine spurdog squalus mitsukurii. | descriptions are given for two new species of hexabothriid monogeneans, one collected from the gills of shortspine spurdog squalus mitsukurii and the other from the gills of the ginzame chimaera phantasma in sagami bay on the pacific coast of japan. squalonchocotyle mitsukurii n. sp. from squalus mitsukurii can be distinguished from squalonchocotyle squali maccallum, 1931, the most closely related species, by the inwardly curved vagina. callorhynchocotyle sagamiensis n. sp. from chimaera phantas ... | 2006 | 16933026 |
| a new species of calicotyle diesing, 1850 (monogenea: monocotylidae) from the shortspine spurdog squalus mitsukurii jordan & snyder and the synonymy of gymnocalicotyle nybelin, 1941 with this genus. | calicotyle japonica n. sp., collected from the uterus, rectal gland, archinephric duct and cloaca of the shortspine spurdog squalus mitsukurii jordan & snyder (squaliformes) off the pacific coast of japan, is described. the new species can be distinguished from c. inermis woolcock, 1936 by the shape of the male copulatory organ; in c. japonica this is directed anteriorly, is sharply bent in the middle and then increases in width toward the tip, whereas it is long, coiled and uniform in width thr ... | 2010 | 20119704 |
| visual optics and ecomorphology of the growing shark eye: a comparison between deep and shallow water species. | elasmobranch fishes utilise their vision as an important source of sensory information, and a range of visual adaptations have been shown to reflect the ecological diversity of this vertebrate group. this study investigates the hypotheses that visual optics can predict differences in habitat and behaviour and that visual optics change with ontogenetic growth of the eye to maintain optical performance. the study examines eye structure, pupillary movement, transmission properties of the ocular med ... | 2009 | 19837900 |
| eye growth in sharks: ecological implications for changes in retinal topography and visual resolution. | the visual abilities of sharks show substantial interspecific variability. in addition, sharks may change their habitat and feeding strategy throughout life. as the eyes of sharks continue to grow throughout the animal's lifetime, ontogenetic variability in visual ability may also occur. the topographic analysis of the photoreceptor and ganglion cell distributions can identify visual specializations and assess changes in visual abilities that may occur concurrently with eye growth. this study ex ... | 2009 | 19698193 |
| notes on shark and ray types at the south china sea fisheries research institute (scsfri) in guangzhou, china. | most of the shark and ray type material at the south china sea fisheries research institute (scsfri) in guangzhou, china was examined during a museum visit by the senior author in 2009. the status of the shark and ray species described from the south china sea in the 1980s and deposited in this collection is discussed. squalus acutirostris is considered a junior synonym of squalus mitsukurii from the western north pacific. centrophorus ferrugineus is considered a junior synonym of centrophorus s ... | 2013 | 25229117 |
| squalus formosus, a new species of spurdog shark (squaliformes: squalidae), from the western north pacific ocean. | a new species of spurdog, squalus formosus n. sp., from the lower continental shelf and upper continental slope off the coast of taiwan and southern japan, is described. it belongs to the 'highfin megalops group', the members of which share a short snout, high dorsal fins, robust dorsal spines, tricuspid denticles and a white posterior caudal margin. squalus formosus is most similar to squalus albifrons, a recently described species from eastern australia, but differs in some morphological chara ... | 2011 | 21967583 |