| transmission of loma salmonae (microsporea) to chinook salmon in sea water. | transmission studies were conducted to determine if loma salmonae was transmissible in sea water. transmission of l. salmonae to chinook salmon (oncorhynchus tshawytscha) held in sea water was achieved by exposing fish to macerated, infected gill tissue. fish were exposed in seawater in a flow-through aquarium, and the infection was detected as soon as 5 wk after exposure. heavily infected fish exhibited numerous xenomas in the branchial arteries, central venous sinusoids, and within the blood c ... | 1995 | 7728735 |
| a new species of loma (microsporea) in shiner perch (cymatogaster aggregata). | loma embiotocia n. sp. is described from the gills of shiner perch (cymatogaster aggregata) from waters off vancouver island, british columbia, canada. highest prevalence at a site was 15% and greatest intensity was 583 xenomas per fish. xenomas averaged 0.13 mm in diameter (0.06-0.16 mm) and contained ovoid spores 4.8 x 2.6 (4.0-5.0 x 2.0-3.0) microns. sporogonic stages were dispersed throughout the xenomas. the xenoma wall was smooth lacking invaginations into the cyto plasm: sporoblasts were ... | 1997 | 9105314 |
| seasonal, interannual, and long-term variation in sport fish contamination, san francisco bay. | this study documents changes in contamination over time at seasonal, interannual, and decadal time scales for sport fish collected in san francisco bay. samples from seven fish species were prepared according to common consumption practices (muscle fillets either with or without skin) and analyzed for trace metals (mercury and selenium) and trace organochlorine contaminants (pcbs, ddts, chlordanes, and dieldrin). in 2000, sport fish samples exceeded human health screening values for mercury, pcb ... | 2005 | 15589247 |
| brain acetylcholinesterase activity in shiner perch (cymatogaster aggregata) and juvenile chinook salmon (oncorhynchus tshawytscha) after application of carbaryl to control burrowing shrimp within willapa bay, washington. | carbaryl has been applied in willapa bay, washington, for five decades to control burrowing shrimp (neotrypaea californiensis and upogebia pugettensis) on commercial oyster (crassostrea gigas) beds. concerns about effects on nontarget species, including fishes, have led to restrictions in use despite a lack of data on in situ exposure. we measured brain acetylcholinesterase (ache) activity in adult shiner perch (cymatogaster aggregata) and juvenile chinook salmon (oncorhynchus tshawytscha) after ... | 2013 | 24042340 |
| the complete mitochondrial genome of the black surfperch, embiotoca jacksoni: selection and substitution rates among surfperches (embiotocidae). | the complete 16,515bp nucleotide sequence of the mitochondrial genome was determined for the black surfperch, embiotoca jacksoni (perciformes: embiotocidae). the black surfperch mitochondrial genome contains 13 protein-coding genes, two ribosomal rna genes, 22 transfer rna genes, and the non-coding control region (d-loop), the gene order of which is identical to that observed in most vertebrates. the protein-coding gene sequences of e. jacksoni mitochondrial dna were compared with two other embi ... | 2016 | 26994927 |
| effect of closed v. intermittent-flow respirometry on hypoxia tolerance in the shiner perch cymatogaster aggregata. | this study compares the critical oxygen saturation (o2 crit ) levels of the shiner perch cymatogaster aggregata obtained using two different methods wherein hypoxia is induced either by the fish's respiration (closed respirometry) or by degassing oxygen with nitrogen (intermittent-flow respirometry). fish exhibited loss of equilibrium at a higher o2 saturation in the closed respirometry method when compared with the intermittent-flow method. utilization of closed respirometry yielded o2 crit mea ... | 2016 | 26768977 |
| eye movements are coordinated with pectoral fin beats during locomotion in a marine teleost fish. | animals must simultaneously engage multiple functional systems in order to navigate, feed and survive in complex environments. nearly all vertebrates perform rapid gaze-shifting eye movements called saccades, but we know little about the behaviour of saccades during rhythmic locomotion. this study examined how saccades are coordinated with locomotor movements in a pectoral-fin-propelled teleost fish, cymatogaster aggregata, the shiner surfperch. individual fish were filmed swimming in a flow tan ... | 2015 | 25714565 |
| multiple paternity is a shared reproductive strategy in the live-bearing surfperches (embiotocidae) that may be associated with female fitness. | according to bateman's principle, female fecundity is limited relative to males, setting the expectation that males should be promiscuous, while females should be choosy and select fewer mates. however, several surfperches (embiotocidae) exhibit multiple paternity within broods indicating that females mate with multiple males throughout the mating season. previous studies found no correlation between mating success and reproductive success (i.e., a bateman gradient). however, by including sample ... | 2014 | 25360270 |
| unsteady flow affects swimming energetics in a labriform fish (cymatogaster aggregata). | unsteady water flows are common in nature, yet the swimming performance of fishes is typically evaluated at constant, steady speeds in the laboratory. we examined how cyclic changes in water flow velocity affect the swimming performance and energetics of a labriform swimmer, the shiner surfperch, cymatogaster aggregata, during station holding. using intermittent-flow respirometry, we measured critical swimming speed (ucrit), oxygen consumption rates (o2) and pectoral fin use in steady flow versu ... | 2014 | 24115060 |
| molecular evidence for multiple paternity in a population of the viviparous tule perch hysterocarpus traski. | population density might be an important variable in determining the degree of multiple paternity. in a previous study, a high level of multiple paternity was detected in the shiner perch cymatogaster aggregata, a species with high population density and a high mate encounter rate. the tule perch hysterocarpus traski is phylogenetically closely related to c. aggregata, but it has relatively lower population density, which may result in distinct patterns of multiple paternity in these 2 species. ... | 2013 | 23267018 |
| brominated and chlorinated flame retardants in san francisco bay sediments and wildlife. | restrictions on the use of polybrominated diphenyl ethers (pbdes) have resulted in the use of alternative flame retardants in consumer products to comply with flammability standards. in contrast to pbdes, information on the occurrence and fate of these alternative compounds in the environment is limited, particularly in the united states. in this study, a survey of flame retardants in san francisco bay was conducted to evaluate whether pbde replacement chemicals and other current use flame retar ... | 2012 | 22766500 |
| high degree of multiple paternity in the viviparous shiner perch, cymatogaster aggregata, a fish with long-term female sperm storage. | the shiner perch (cymatogaster aggregata gibbons) exhibits a viviparous reproductive mode and long-term female sperm storage, two biological features that may predispose this fish species for both intense sperm competition and frequent multiple paternity within broods. to test these hypotheses, we used polymorphic microsatellite markers to identify sires and quantify paternal contributions to the progeny arrays of 27 pregnant females from a natural population of c. aggregata. the number of sires ... | 2011 | 24391263 |
| behavioural asymmetry affects escape performance in a teleost fish. | escape performance is fundamental for survival in fish and most other animals. while previous work has shown that both intrinsic (e.g. size, shape) and extrinsic (e.g. temperature, hypoxia) factors can affect escape performance, the possibility that behavioural asymmetry may affect timing and locomotor performance in startled fish is largely unexplored. numerous studies have found a relationship between brain lateralization and performance in several cognitive tasks. here, we tested the hypothes ... | 2010 | 20089537 |
| habitat-dependent geographical variation in ontogenetic allometry of the shiner perch cymatogaster aggregata gibbons (teleostei: embiotocidae). | studies of intraspecific morphological variation in fishes have traditionally focused on freshwater rather than marine species. in addition, such studies typically focus on adults, although causes and intensities of selective pressures most likely vary through an individual's lifetime. in this study, body and head shape of a marine species, shiner perch cymatogaster aggregata gibbons were compared among localities along the pacific northwest coast of north america. evidence was found for intrasp ... | 2007 | 17714296 |
| visual cues eliciting the feeding reaction of a planktivorous fish swimming in a current. | the visual plankivorous feeding behaviour of the shiner perch (cymatogaster aggregata) was investigated by means of a flow tank operated at various current speeds. artemia salina was used as prey. in a second set of experiments, artemia was darkened with black ink, to compare the visually mediated behaviour of c. aggregata while feeding on dark prey vs feeding on natural (i.e. semi-transparent) prey. the positions of the fish and its prey at the time of the feeding reaction of c. aggregata were ... | 2005 | 15755881 |
| prevalence and intensity of haemobaphes diceraus (copepoda: pennellidae) from shiner perch, cymatogaster aggregata (embiotocidae). | the prevalence and intensity of the hematophagous pennellid copepod haemobaphes diceraus were monitored over a 10-mo period in shiner perch cymatogaster aggregata at pipers lagoon, nanaimo, british columbia. the prevalence and mean intensity of metamorphosed adult female h. diceraus (n = 421) were 10.0% and 1.2 (+/-0.5 sd), respectively. the majority (97.9%) of infected fish had single infections, reflecting the possibility of intensity-dependent parasite-induced mortality, rejection of addition ... | 2002 | 12053967 |
| energetics of swimming in fishes using different methods of locomotion: i. labriform swimmers. | the patterns relating rates of oxygen consumption to steady sustained and prolonged swimming at different speeds were determined in adults or near adults of two species of marine fishes that use the labriform mode of swimming (labriform swimmers). effects of acute temperature changes on these patterns were measured. species were the shiner surfperch,cymatogaster aggregata and the señorita wrasse,oxyjulis californica.metabolic data were analyzed three different ways. the first (method of brett) w ... | 1989 | 24221687 |
| acute toxicity of butylbenzyl phthalate to shiner perch (cymatogaster aggregata). | | 1983 | 6651340 |
| cyclic changes in fine structure of the epithelium lining the ovary of the viviparous teleost, cymatogaster aggregata (perciformes: embiotocidae). | the most striking morphological feature of the ovarian epithelium of cymatogaster is the presence of intercellular dilations during much of the year. these dilations increase markedly in volume during the several months prior to ovulation and fertilization, and decrease in volume during the months of embryogenesis and gestation. the epithelium then returns to its initial, relatively undifferentiated state. the extracellular material within the dilations likely is synthesized in the cells adjacen ... | 1978 | 671554 |
| endocrine controls of spermatogenesis and oogenesis in the viviparous seaperch cymatogaster aggregata gibbons. | | 1969 | 5779818 |
| steroid dehydrogenases and steroids in gonads of the seaperch cymatogaster aggregata gibbons. | | 1969 | 4305330 |
| studies on the structure and ultrastructure of the intact and "methallibure" -treated meso-adenohypophysis of the viviparous teleost cymatogaster aggregata gibbons. | | 1969 | 4896932 |
| inhibition of pituitary gonadotrophic activity in the viviparous seaperch cymatogaster aggregata gibbons by a dithiocarbamoylhydrazine derivative (i.c.i. 33 828). | | 1968 | 5749475 |
| a technique for gonadectomy in the seaperch cymatogaster aggregata. | | 1968 | 5690289 |