Publications

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immediate and delayed effects of gill-net capture on acid-base balance and intramuscular lactate concentration of gummy sharks, mustelus antarcticus.many sharks are captured as untargeted by-catch during commercial fishing operations and are subsequently discarded. a reliable assessment of the proportion of discarded sharks that die post-release as a result of excessive physiological stress is important for fisheries management and conservation purposes, but a reliable physiological predictor of post-release mortality has not been identified. to investigate effects of gill-net capture on the acid-base balance of sharks, we exposed gummy shar ...201121377534
fine-scale movements of the broadnose sevengill shark and its main prey, the gummy shark.information on the fine-scale movement of predators and their prey is important to interpret foraging behaviours and activity patterns. an understanding of these behaviours will help determine predator-prey relationships and their effects on community dynamics. for instance understanding a predator's movement behaviour may alter pre determined expectations of prey behaviour, as almost any aspect of the prey's decisions from foraging to mating can be influenced by the risk of predation. acoustic ...201021151925
gestational morphogenesis of the uterine epithelium of the gummy shark (mustelus antarcticus).developing embryos of the non-placental, viviparous gummy shark (mustelus antarcticus) are supplied with yolk from external and internal yolk sacs throughout the initial stages of gestation. yolk supplies are exhausted by the 7th month of an 11-12 month gestation. during embryonic development, there is an approximate 800% gain in dry mass. these factors suggest nutrients are transferred from the mother to the young. the results of the present study provide some insights into how this is occurrin ...200919117062
two new species of paraorygmatobothrium ruhnke, 1994 (tetraphyllidea: phyllobothriidae) from the smooth-hound mustelus mustelus (l.) and the gummy shark m. antarcticus günther (carcharhiniformes: triakidae).two new tetraphyllidean species, paraorygmatobothrium bai n. sp. and p. rodmani n. sp., are described from the smooth-hound shark mustelus mustelus (linnaeus) and the gummy shark m.s antarcticus günther, respectively. the two species are generally consistent in morphology with the nine existing species of paraorygmatobothrium ruhnke, 1994. p. bai n. sp. and p. rodmani n. sp. differ from the existing species of paraorygmatobothrium in exhibiting gravid proglottids on the strobila. p. bai n. sp. d ...200818815900
microscopic organization of the sperm storage tubules in the oviducal gland of the female gummy shark (mustelus antarcticus), with observations on sperm distribution and storage.oviducal gland morphology, the microscopic organization of the terminal zone, and sperm storage were described in the female gummy shark (mustelus antarcticus). mustelus antarcticus is a nonplacental viviparous hound shark, which displays minimal histotrophy during embryonic development. the animals examined represented all stages of maturity and gestation. the oviducal gland was found to have the same fundamental zonation as in most chondrichthyans. using recent terminology, the oviducal gland ...200818756524
immunolocalisation of sodium/proton exchanger-like proteins in the gills of elasmobranchs.na+/h+ exchangers are integral membrane proteins that exchange na+ and h+ across cell membranes. the na+/h+ exchangers 2 and 3 are epithelial isoforms in mammals and contribute to acid-base homeostasis. the gills of fishes, including elasmobranchs, are also associated with acid/base balance, and are probably the primary acid/base regulatory organ. this study examines the presence of na+/h+ exchangers 2 and 3 using immunohistochemistry and immunoblotting in the gills of four species of elasmobran ...200211818215
analysis of calliobothrium (tetraphyllidea:onchobothriidae) with descriptions of three new species and erection of a new genus.examination of voucher or type material, or both, of 9 of the 10 currently recognized species of calliobothrium resulted in redescriptions of c. evani, c. lintoni, and c. pellucidum, and emendations of the descriptions of c. eschrichti and c. leuckarti. new collections of calliobothrium from the spiral intestines of mustelus spp. led to the discovery of 3 new species: calliobothrium hayhowi n. sp. from mustelus antarcticus in australia, calliobothrium riseri n sp. from mustelus henlei in the sea ...19979267417
macrophage-lymphocyte cell clusters in the hypothalamic ventricle of some elasmobranch fish: ultrastructural analysis and possible functional significance.previous studies have demonstrated the existence of lympho-haemopoietic tissue in the meninges and choroid plexuses of various primitive vertebrates, including the stingray dasyatis akajei and in early human embryos. in the present study, we extend these results analyzing macrophage-lymphocyte cell clusters found in the floor of the hypothalamic ventricle of several specimens of elasmobranchs.19957573986
myoglobins of cartilaginous fishes. ii. isolation and amino acid sequence of myoglobin of the shark mustelus antarcticus.myoglobin isolated from red muscle of the gummy shark m. antarcticus was purified by gel filtration and ion-exchange chromatography on carboxymethyl cellulose in 8 m urea-thiol buffer. amino acid analysis and sequence determination showed 148 amino acid residues. the amino terminal residue is acetylated as shown by nuclear magnetic resonance and mass spectrographic analysis of an n-terminal peptide. there is a deletion of four residues at the amino terminal end as well as one residue in the cd i ...19807436864
myoglobins of cartilaginous fishes iii. amino acid sequence of myoglobin of the shark galeorhinus australis.myoglobin isolated from the red muscle of the school shark galeorhinus australis was purified by gel filtration and ion-exchange chromatography. the amino acid sequence was determined following digestion with trypsin and purification of the peptides by paper ionophoresis and chromatography. sequences of purified peptides were determined by the dansyl-edman procedure and the peptides aligned by homology with the sequence of the myoglobin of the gummy shark mustelus antarcticus. the two myoglobin ...19817259634
vascularization of the hypothalamo-hypophysial complex in japanese elasmobranchs: a scanning electron microscope study of blood vascular casts.to study in detail vascularization in the hypothalamo-hypophysial complex in some japanese elasmobranchs, injection casts of blood vessels were observed by scanning electron microscopy. materials used were a gummy shark (mustelus manazo), a cloudy dogfish (scyliorhinus torazame) and a skate (raja porosa). the vascular supply to the hypothalamo-hypophysial region of the elasmobranchs is carried out by the inferior hypothalamic arteries and their branches that originate from the internal carotid a ...19873619596
evolutionary divergence in the structure of myelin basic protein: comparison of chondrichthye basic proteins with those from higher vertebrates.a basic protein has been purified from the cns myelin of the gummy shark (mustelus antarticus). electroblotting was used to examine the capacity of rabbit antisera raised against this electrophoretically pure protein to recognize myelin basic protein from higher vertebrates. the antisera bound to two shark proteins including the original polypeptide antigen and to chicken, bovine, and human myelin basic proteins. thus, the shark protein appeared to possess antigenic determinants that have been r ...19862419503
statistical comparison of the results from six analytical chemistry laboratories of the mercury content of muscle tissue of two species of sharks.statistical tests were carried out on the results of chemical analysis for total mercury concentrations of replicate samples of muscle tissue of school shark galeorhinus australis (macleay) and gummy shark mustelus antarcticus guenther from six independent analytical laboratories. these tests showed that one laboratory produced results 9% below the overall average of all results, another 1% below average while the other four were all 5% above average. moreover, one laboratory had significantly l ...1977892963
distribution of pancreatic elastase and metalloproteinase in vertebrates.elastase-like enzymes were detected as zymogens in all of the pancreatic extracts from the gummy shark, bullhead shark, angel shark, smooth hammerhead, bestel, rainbow trout, carp, eel, japanese mackerel, yellowtail, sea bass, parrotfish, bullfrog, chicken, bluewhite dolphin, hog, rat, cat, and dog. the distribution of pancreatic elastase and metalloproteinase was examined on the basis of the effect of specific inhibitors on elastase like-activity in each extract. the results indicate that pancr ...19863484693
the fine structure of initial mineralisation during tooth development in the gummy shark, mustelus manazo, elasmobranchia.in the enameloid matrix a large number of tubular vesicles appeared around the odontoblast processes at the stage of enameloid matrix formation. the tubular vesicles were limited by unit membrane and the membrane often seemed to connect with that of the odontoblast processes. the tubular vesicles probably originated from the odontoblasts. electron-dense granules were observed in the tubular vesicles before the appearance of crystals and then, in the stage of mineralisation, initial enameloid cry ...19892606790
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