| diphyllobothriasis: fish tapeworm disease in the circumpolar north. | although fish tapeworm infections in arctic and subarctic residents are often attributed to the cestode diphyllobothrium latum, other diphyllobothrium species are frequently responsible. d. dendriticum, for example, occurs throughout the circumpolar area at high latitudes beyond the range of d. latum. several additional species are also implicated in human infections in northern communities bordering the pacific: d. ursi from northern canada and alaska, d. dalliae from alaska and siberia, and d. ... | 1991 | 2021393 |
| ultrastructure of the proglottid tegument (neodermis) of the cestode echinophallus wageneri (pseudophyllidea: echinophallidae), a parasite of the bathypelagic fish centrolophus niger. | ultrastructural data are provided on the tegument (or neodermis) of proglottids of the cestode echinophallus wageneri monticelli, 1890, the first representative of the family echinophallidae (pseudophyllidea), parasites of bathypelagic fish, studied using transmission and scanning electron microscopy. the surface of the ventral concave side of proglottids is covered with filiform microtriches about 1.7 microm long. their glycocalyx, although very thick, is less extensively developed compared to ... | 2007 | 17390148 |
| bothriocephalidean tapeworms (cestoda) from the blackfish, centrolophus niger (perciformes: centrolophidae). | bothriocephalidean tapeworms parasitic in the blackfish, centrolophus niger (gmelin) (perciformes: centrolophidae), are redescribed on the basis of the evaluation of freshly collected specimens and museum material. this evaluation enabled us to supplement species diagnoses by new morphological characters of potential use for phylogenetic analyses, including the data from scanning electron microscopical observations, and to provide a key to identification of the following four species occurring i ... | 2008 | 18666414 |
| comparative larvivorous performances of mosquitofish, gambusia affinis, and juvenile sacramento blackfish, orthodon microlepidotus, in experimental paddies. | mosquitofish, sacramento blackfish, or combinations of both species were stocked in experimental paddies. cultured culex tarsalis larvae, stocked weekly into each paddy, and wild anopheles freeborni larvae were counted by dipping. at the end of the 12 week experiment, paddies were drained and the remaining fish and visible invertebrates counted. data show the highest number of mosquito larvae in the blackfish-stocked paddies. this low larvivorous ability of blackfish may result from their rapid ... | 2012 | 3504893 |
| structure of an air-breathing organ and the swim bladder in the alaska blackfish, dallia pectoralis bean. | | 2015 | 4418753 |
| australian seafood compositional profiles: a pilot study. vitamin d and mercury content. | given the scarcity of comprehensive nutritional data for australia's >400 commercially produced seafood species a pilot study was undertaken to collect and analyse 22 species of wild and aquaculture seafood in order to develop a model for future comprehensive surveys. the species analysed were: atlantic salmon, australian sardine, prawn (six species), barramundi, abalone (three species), blue sprat, burrowing blackfish, gummy shark, oyster (four species), ocean trout and yellowtail kingfish. the ... | 2016 | 26433295 |
| patterns of occurrence and marine mammal acoustic behavior in relation to navy sonar activity off jacksonville, florida. | passive acoustic data collected from marine autonomous recording units deployed off jacksonville, fl (from 13 september to 8 october 2009 and 3 december 2009 to 8 january 2010), were analyzed for detection of cetaceans and navy sonar. cetaceans detected included balaenoptera acutorostrata, eubalaena glacialis, b. borealis, physeter macrocephalus, blackfish, and delphinids. e. glacialis were detected at shallow and, somewhat unexpectedly, deep sites. p. macrocephalus were characterized by a stron ... | 2016 | 26611034 |
| trophic ecology of introduced populations of alaska blackfish (dallia pectoralis) in the cook inlet basin, alaska. | introduced non-native fishes have the potential to substantially alter aquatic ecology in the introduced range through competition and predation. the alaska blackfish (dallia pectoralis) is a freshwater fish endemic to chukotka and alaska north of the alaska range (beringia); the species was introduced outside of its native range to the cook inlet basin of alaska in the 1950s, where it has since become widespread. here we characterize the diet of alaska blackfish at three cook inlet basin sites, ... | 2016 | 28082763 |
| landscape genetics informs mesohabitat preference and conservation priorities for a surrogate indicator species in a highly fragmented river system. | poor dispersal species represent conservative benchmarks for biodiversity management because they provide insights into ecological processes influenced by habitat fragmentation that are less evident in more dispersive organisms. here we used the poorly dispersive and threatened river blackfish (gadopsis marmoratus) as a surrogate indicator system for assessing the effects of fragmentation in highly modified river basins and for prioritizing basin-wide management strategies. we combined individua ... | 2017 | 27876805 |
| temperature-dependence of l-type ca(2+) current in ventricular cardiomyocytes of the alaska blackfish (dallia pectoralis). | to lend insight into the overwintering strategy of the alaska blackfish (dallia pectoralis), we acclimated fish to 15 or 5 °c and then utilized whole-cell patch clamp to characterize the effects of thermal acclimation and acute temperature change on the density and kinetics of ventricular l-type ca(2+) current (i ca). peak i ca density at 5 °c (-1.1 ± 0.1 pa pf(-1)) was 1/8th that at 15 °c (-8.8 ± 0.6 pa pf(-1)). however, alterations of the ca(2+)- and voltage-dependent inactivation properties o ... | 2015 | 26439127 |
| persistent organochlorine pesticide exposure related to a formerly used defense site on st. lawrence island, alaska: data from sentinel fish and human sera. | st. lawrence island, alaska, is the largest island in the bering sea, located 60 km from siberia. the island is home to approximately 1600 st. lawrence island yupik residents who live a subsistence way of life. two formerly used defense sites (fuds) exist on the island, one of which, northeast cape, has been the subject of a $123 million cleanup effort. environmental monitoring demonstrates localized soil and watershed contamination with polychlorinated biphenyls (pcb), organochlorine (oc) pesti ... | 2015 | 26262441 |
| beringian sub-refugia revealed in blackfish (dallia): implications for understanding the effects of pleistocene glaciations on beringian taxa and other arctic aquatic fauna. | pleistocene climatic instability had profound and diverse effects on the distribution and abundance of arctic organisms revealed by variation in phylogeographic patterns documented in extant arctic populations. to better understand the effects of geography and paleoclimate on beringian freshwater fishes, we examined genetic variability in the genus dallia (blackfish: esociformes: esocidae). the genus dallia groups between one and three nominal species of small, cold- and hypoxia-tolerant freshwa ... | 2015 | 26187279 |
| characterization of mhc class iib for four endangered australian freshwater fishes obtained from ecologically divergent populations. | genetic diversity is an essential aspect of species viability, and assessments of neutral genetic diversity are regularly implemented in captive breeding and conservation programs. despite their importance, information from adaptive markers is rarely included in such programs. a promising marker of significance in fitness and adaptive potential is the major histocompatibility complex (mhc), a key component of the adaptive immune system. populations of australian freshwater fishes are generally d ... | 2015 | 26093210 |
| acoustic detection of biosonar activity of deep diving odontocetes at josephine seamount high seas marine protected area. | the temporal occurrence of deep diving cetaceans in the josephine seamount high seas marine protected area (jshsmpa), south-west portugal, was monitored using a passive acoustic recorder. the recorder was deployed on 13 may 2010 at a depth of 814 m during the north atlantic treaty organization centre for maritime research and experimentation cruise "sirena10" and recovered on 6 june 2010. the recorder was programmed to record 40 s of data every 2 min. acoustic data analysis, for the detection an ... | 2015 | 25994682 |
| intra-population trends in the maturation and reproduction of a temperate marine herbivore girella elevata across latitudinal clines. | latitudinal variation in the reproductive characteristics of a temperate marine herbivore, rock blackfish girella elevata, was examined from three regions of the south-eastern australian coast. biological sampling covered 780 km of coastline, including the majority of the species distribution. the sampling range incorporated three distinct oceanographic regions of the east australian current, a poleward-flowing western boundary current of the southern pacific gyre and climate-change hotspot. gir ... | 2015 | 25613077 |
| air breathing in the arctic: influence of temperature, hypoxia, activity and restricted air access on respiratory physiology of the alaska blackfish dallia pectoralis. | the alaska blackfish (dallia pectoralis) is an air-breathing fish native to alaska and the bering sea islands, where it inhabits lakes that are ice-covered in the winter, but enters warm and hypoxic waters in the summer to forage and reproduce. to understand the respiratory physiology of this species under these conditions and the selective pressures that maintain the ability to breathe air, we acclimated fish to 5°c and 15°c and used respirometry to measure: standard oxygen uptake (ṁ(o₂)) in n ... | 2014 | 25394628 |
| the complete mitogenome of the river blackfish, gadopsis marmoratus (richardson, 1848) (teleostei: percichthyidae). | the mitogenome of the australian freshwater blackfish, gadopsis marmoratus was recovered coverage by genome skimming using the miseq sequencer (genbank accession number: nc_024436). the blackfish mitogenome has 16,407 base pairs made up of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer rnas, and a 819 bp non-coding at-rich region. this is the 5th mitogenome sequence to be reported for the family percichthyidae. | 2016 | 25329292 |
| mitochondrial phylogeography of a beringian relict: the endemic freshwater genus of blackfish dallia (esociformes). | mitochondrial genetic variability among populations of the blackfish genus dallia (esociformes) across beringia was examined. levels of divergence and patterns of geographic distribution of mitochondrial dna lineages were characterized using phylogenetic inference, median-joining haplotype networks, bayesian skyline plots, mismatch analysis and spatial analysis of molecular variance (samova) to infer genealogical relationships and to assess patterns of phylogeography among extant mitochondrial l ... | 2014 | 24490938 |
| community-based participatory research projects and policy engagement to protect environmental health on st lawrence island, alaska. | this article synthesizes discussion of collaborative research results, interventions and policy engagement for st lawrence island (sli), alaska, during the years 2000-2012. | 2013 | 23977641 |
| a new triaenophorid tapeworm from blackfish centrolophus niger. | milanella familiaris n. gen. and n. sp. (bothriocephalidea: triaenophoridae) is proposed to accommodate a new cestode from blackfish centrolophus niger (gmelin) (perciformes: centrolophidae). milanella is characterized as follows: trapeziform, i.e., markedly craspedote proglottids with a velum-like posterior margin and horn like lateral projections; pyriform uterine sac in the first gravid proglottids; arrow-shaped scolex with well-developed apical disc and prominent posterior margins; strobila ... | 2008 | 18564751 |
| effects of dietary methylmercury on juvenile sacramento blackfish bioenergetics. | although much is known about the biogeochemical cycling of mercury in the environment, relatively little is known about methylmercury (mehg) bioaccumulation in fishes and how chronic sub-lethal exposures affect their functioning. several species of fish in clear lake, california have high mehg tissue levels, including sacramento blackfish, orthodon microlepidotus, a large native cyprinid that is fished commercially. we fed juvenile blackfish one of four diets containing mehg (0.21 mg/kg control; ... | 2004 | 15261448 |
| unusually high levels of non-saponifiable lipids in the fishes escolar and rudderfish identification by gas and thin-layer chromatography. | analysis of the non-saponifiable lipids of the fishes lepidocybium flavobrunneum and ruvettus pretiosus (escolar), and centrolophus niger and tubbia spp. (rudderfish) was performed. the analyses were used to clarify the cause of recent reports of illness (diarrhoea) in australia from consumption of purported rudderfish. both escolar and rudderfish contained very high levels of oil (generally between 14 to 25%, as % wet mass) in the fillet and the oil compositions were different to most seafood. ... | 2001 | 11760999 |
| paddlefish buccal flow velocity during ram suspension feeding and ram ventilation | a micro-thermistor probe was inserted into the buccal cavity of freely swimming paddlefish to measure flow velocity during ram ventilation, ram suspension feeding and prey processing. swimming speed was measured from videotapes recorded simultaneously with the buccal flow velocity measurements. both swimming velocity and buccal flow velocity were significantly higher during suspension feeding than during ram ventilation. as the paddlefish shifted from ventilation to feeding, buccal flow velocity ... | 1994 | 9317518 |
| fluid dynamics in suspension-feeding blackfish. | measurements of flow patterns and water velocities inside the oral cavity of blackfish (orthodon microlepidotus), made with a fiberoptic endoscope and thermistor flow probe, revealed that gill-arch structures act in blackfish as barriers that direct particle-laden water to the mucus-covered roof of the oral cavity, where particles are retained. gill-arch structures have previously been assumed to be the site of particle retention in suspension-feeding fishes. water does not pass between these st ... | 1991 | 17816190 |
| the effects on the plankton community of filter-feeding sacramento blackfish, orthodon microlepidotus. | a series of mesocosm experiments was performed to assess the effects on the plankton community of filter-feeding sacramento blackfish (cyprinidae; orthodon microlepidotus). phytoplankton size-frequency distribution, zooplankton abundance, primary production, potential secondary production, and nutrient concentrations were measured. blackfish reduce numbers of both evasive and nonevasive zooplankton and large phytoplankton while enhancing nanoplankton densities. blackfish also significantly incre ... | 1990 | 28313006 |
| lactate dehydrogenases of the australian freshwater blackfish gadopsis marmoratus richardson: identification of isoenzymes, and immunochemical comparison of blackfish ldhm4 with the homologous enzyme from proposed marine ancestors. | | 1983 | 6403284 |
| parameters of texture change in processed fish: cross-linkage of proteins. | soluble myosin and insoluble protein (i. e., soluble only in 5 % sodium dodecyl sulfate) were obtained from fresh and processed sacramento blackfish and analyzed for the existence of possible cross-links. free sulfhydryl groups decreased somewhat in freezing and more in frozen storage. none were present after dehydration or cooking nor in any insoluble fractions, so that presumably these were oxidized in the formation of cross-links. ester bonds were much more numerous in insoluble protein than ... | 1970 | 28370007 |
| parameters of texture change in processed fish: protein crystallization. | processed muscle of the sacramento blackfish (orthodon microlepidotus) was examined for changes in crystallinity by x-ray diffraction and relative water vapor uptake, the specimens having been prepared by the freeze-substitution procedure. although only a slight increase in crystallinity occurred on processing, both methods agreed in showing a small increase in crystallinity on freezing, a somewhat greater increase on cooking, and a still greater increase on dehydrating. further increases in cry ... | 1970 | 28372005 |
| parameters of texture change in processed fish: myosin denaturation. | the white muscle of the sacramento blackfish (orthodon microlepidotus) was processed by freezing, dehydration, and cooking. myosin was extracted immediately afterwards or following a period of storage in order to examine evidence for denaturation. the tests used were the solubility of whole muscle protein and the intrinsic viscosity, isoelectric point, atpase activity, ultra-violet absorption spectrum, and optical rotatory dispersion of purified myosin extract. almost all measures used showed th ... | 1970 | 28371971 |
| sustained swimming speeds of dolphins. | observations of fout large groups of dolphins suggest that they are able to swim at a sustained speed of 14 to 18 knots. the blackfish are able to maintain speeds of about 22 knots, and one killer whale seemed able to swim somewhat faster. this implies that the apparent coefficient of surface friction remains approximately constant for dolphins from 6 to 22 ft long, as is the case for rigid bodies. | 1960 | 17777385 |