philometrids of the southern flounder paralichthys lethostigma : a multidimensional approach to determine their diversity.abstract two species of philometrid nematode, philometra overstreeti and philometroides paralichthydis , infect the southern flounder, paralichthys lethostigma . individuals of p. overstreeti are located between the teeth and inside the bony part of the branchial arches of the fish. individuals of p. paralichthydis are associated with the bones of the buccal cavity and among muscles that control the dorsal and anal fins. sequencing of part of the cytochrome oxidase i gene revealed 4 distinct gen ...201121506857
histopathology of two philometrid parasites of the southern flounder, paralichthys lethostigma.the southern flounder paralichthys lethostigma is host to two species of philometrid nematodes in the estuarine systems of south carolina, usa. histologic studies showed that all worms were hematophagous and that the host-parasite interface varied according to the worm's location in the fish. individuals of philometra overstreeti associated with the teeth induced a degradation of the enameloid epithelium but elicited minimal host reaction, whereas those located in the branchial arches induced an ...201020090044
development of the philometrids philometra overstreeti and philometroides paralichthydis in the experimentally infected copepod oithona colcarva.philometra overstreeti moravec et de buron, 2006 and philomnetroides paralichthydis moravec et de buron, 2006 are common parasites of the southern flounder, paralichthys lethostigma jordan et gilbert. because the life cycles of these parasites are unknown, our goal was to assess whether species of copepod commonly found in our estuaries could serve as intermediate hosts for these philometrids. individuals of five species of copepods were collected and exposed to l1 larvae of each philometrid spe ...200819175210
involvement of host recognition by oncomiracidia and post-larval survivability in the host specificity of heterobothrium okamotoi (monogenea: diclidophoridae).heterobothrium okamotoi, a monogenean gill parasite, shows high host specificity for tiger puffer, takifugu rubripes. in the present study, in vivo and in vitro experimental infections were conducted using various fish species, including t. rubripes, to understand the mechanisms of specificity. in in vivo experiments, t. rubripes, grass puffer, takifugu niphobles, olive flounder, paralichthys olivaceus, and red sea bream, pagrus major, were exposed to oncomiracidia of h. okamotoi labelled with a ...200717055510
juvenile plaice (pleuronectes platessa) produce camouflage by flexibly combining two separate patterns.plaice (pleuronectes platessa) is a flatfish well-known for the ability to vary its body pattern, probably for camouflage. this study investigates the repertoire of patterns used by juvenile plaice, by describing how they respond to shifts between three artificial backgrounds. two basic patterns are under active control, fine ;spots' and coarser 'blotches'. these patterns are superimposed on a fairly uniform ground. for the six plaice studied, the levels of expression of the spot and blotch patt ...200616916964
indirect coupling of organic anion secretion to sodium in teleost (paralichthys lethostigma) renal tubules.recent findings in both rat and crab indicate that renal accumulation of p-aminohippurate (pah) across the basolateral membrane can be coupled indirectly to the na gradient through pah-glutarate exchange and na/glutarate cotransport. however, the role of this mechanism in net transepithelial pah secretion was not examined. therefore, proximal tubules from southern flounder kidney were used to assess both the presence of indirect coupling in the fish and its relationship to net secretion. [14c]gl ...19911661102
use of molecular tools in identification of philometrid larvae in fishes: technical limitations parallel our poor assessment of their biodiversity.the usefulness of the polymerase chain reaction with restriction fragment length polymorphism (pcr-rflp) and partial sequencing of the cytochrome oxidase i (coi) gene was tested regarding the utility of these techniques in unraveling philometrid life cycles and, in particular, to determine putative paratenic host species. our focus was to study three species of philometrids commonly found in the estuaries of south carolina: philometroides paralichthydis and philometra overstreeti from the southe ...201121656267
population dynamics of the philometrid nematode margolisianum bulbosum in the southern flounder paralichthys lethostigma (pisces: paralichthyidae) in south carolina, usa.this is the first report of the philometrid nematode margolisianum bulbosum blaylock and overstreet, 1999 from the southern flounder paralichthys lethostigma on the east coast of the usa. observation of adult female worms was used as an indication of the parasite's presence in the fish. adult females were found only in p. lethostigma >50 mm total length. the overall prevalence was 74%, with a mean intensity of 5 female nematodes per parasitized fish. infected flounders were found throughout the ...200516042045
margolisianum bulbosum n. gen., n. sp. (nematoda: philometridae) from the southern flounder, paralichthys lethostigma (pisces: bothidae), in mississippi sound, usa.a new species of a philometrid nematode, margolisianum bulbosum, is described from the subcutaneous tissue in the mouth (larvigerous females), head (males, ovigerous, and larvigerous females), and eye (preovigerous females) of the southern flounder, paralichthys lethostigma, from mississippi sound. it is placed in a new genus diagnosed by the combination of 8 large, paired but separate cephalic papillae; no inner cephalic papillae; an esophagus with a separate, muscular anterior bulb; a prominen ...199910219314
effects of a muscle-infecting parasitic nematode on the locomotor performance of their fish host.the southern flounder paralichthys lethostigma, host to the nematode philometroides paralichthydis that is embedded in place of the inclinator muscles of the dorsal and anal fin elements, is hypothesized to impair two aspects of locomotor performance (swimming and burying capacity). peak swimming acceleration and both measures of burying performance did not differ between infected and uninfected fish, whereas swimming velocity of infected fish was significantly lower than that of uninfected fish ...201323557303
two new species of philometrid nematodes (nematoda: philometridae) from the southern flounder paralichthys lethostigma in the estuaries of south carolina, usa.two new philometrid nematodes, philometra overstreeti sp. n. and philometroides paralichthydis sp. n., are described from female specimens collected from the southern flounder paralichthys lethostigma jordan et gilbert (paralichthyidae, pleuronectiformes) in estuaries of south carolina, usa. p. overstreeti is characterized by the presence of eight large, equal in size cephalic papillae, the absence of caudal projections, the body length of gravid females (14.10-27.06 mm) and the location in the ...200616898128
benzo(a)pyrene metabolism in hepatic microsomes from feral and 3-methycholanthrene-treated southern flounder, paralichthys lethostigma.benzo(a)pyrene hydroxylase (ahh) activities were measured in hepatic microsomes from untreated and 3-methylcholanthrene (3-mc) treated southern flounder (paralichthys lethostigma). the ahh activities of only three of the feral animals appeared to be uninduced, i.e., ahh activities were very low (14 to 22 pmol/min/mg protein) and were stimulated approximately 2-fold by 7,8-benzoflavone (7,8-bf)-in vitro. all remaining untreated animals had higher ahh activities (72 to 623 pmol/min/mg) which were ...19846520733
isolation of novel microsatellite markers from paralichthys lethostigma (paralichthyidae) and their cross-species application in pleuronectiformes.we investigated the genetic diversity of the southern flounder paralichthys lethostigma. microsatellite-enriched libraries were constructed and novel microsatellite markers were developed and applied for genetic detection of wild populations. cross-species amplification was also conducted in five pleuronectiforme species. of 45 randomly selected and sequenced clones, 43 contained a ca or ga repeat motif. fourteen pairs of primers were designed to investigate the polymorphism and genetic structur ...201324391024
using telemetry to mitigate the bycatch of long-lived marine vertebrates.the unintended bycatch of long-lived marine species in fishing gear is an important global conservation issue. one suite of management approaches used to address this problem restricts or modifies fishing practices in areas where the probability of bycatch is believed to be high. information on the distribution and behavior of the bycaught species is a desirable component of any such scheme, but such observations are often lacking. we describe a spatially explicit approach that combines data on ...200919769110
renal sugar transport in the winter flounder. vi. reabsorption of d-mannose.the transport of d-mannose (man) in flounder kidney was studied using renal clearance techniques in vivo and brush border membrane (bbm) vesicles in vitro. at plasma concentrations of 50-100 microm man, the winter flounder (pseudopleuronectes americanus) reabsorbed up to 70% of the filtered sugar. man phosphates, but not free man, accumulated in renal cells. reabsorption of man was reduced by phlorizin, d-glucose, methyl-alpha-d-glucoside, methyl-alpha-d-mannoside, and 2-deoxy-d-glucose. in bbm ...19827065250
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