| mercury distribution in sediments and bioaccumulation by fish in two oregon reservoirs: point-source and nonpoint-source impacted systems. | mercury pollution was compared in two oregon reservoirs of similar size and age, located within the same ecoregion. cottage grove reservoir was distinguished by a history of mercury mining and processing within its watershed, while dorena reservoir was not. mercury concentrations in sediments of the reservoirs, tributary streams, and three species of fish were measured. sediment mercury concentrations in the main tributary of cottage grove reservoir, which drains the subbasin where past mercury ... | 1997 | 9419261 |
| species of myxobolus (myxozoa) from the bulbus arteriosus of centrarchid fishes in north america, with a description of two new species. | three species of myxobolus (myxozoa, myxosporea) occur in heart tissue of centrarchids. myxobolus paralintoni li and desser, 1985 from lepomis gibbosus in algonquin park and in lake erie, ontario, has subcircular spores (in plane of spore length) in frontal view (11-13 microm long, 9-10 microm wide, and 5 microm thick) with a width-to-length ratio of 1:1.2. myxobolus jollimorei n. sp. from lepomis macrochirus in lake erie and in the pascagoula river system, mississippi, has subcircular spores (i ... | 1998 | 9576514 |
| host specificity among ancyrocephalinae (monogenoidea) of nebraska sunfish. | this study addressed the problem of local patterns of host specificity among ancyrocephalinae (monogenoidea) on bass and sunfish species, when the hosts occur in different species combinations in separate ponds. one hundred fifty-three fish of the centrarchidae, from 4 study sites in nebraska, were collected. host species included bluegill (lepomis macrochirus), green sunfish (l. cyanellus), largemouth bass (micropterus salmoides), black crappie (pomoxis nigromaculatus), white crappie (p. annula ... | 2003 | 12659307 |
| epizootiology of eustrongylides ignotus in florida: transmission and development of larvae in intermediate hosts. | under laboratory conditions, 2 modes of transmission of eustrongylides ignotus (nematoda: dioctophymatoidea) to fish were identified. eastern mosquitofish (gambusia holbrooki) became infected after ingestion of either eggs of e. ignotus containing first-stage larvae or aquatic oligochaetes (limnodrilus hoffmeisteri) containing third-stage larvae of e. ignotus. after removal from the uterus of gravid e. ignotus females and incubation for 17-28 days, depending on temperature, it was found that par ... | 2003 | 12760643 |
| factors affecting food chain transfer of mercury in the vicinity of the nyanza site, sudbury river, massachusetts. | the influence of the nyanza chemical waste dump superfund site on the sudbury river, massachusetts, was assessed by analysis of sediment, fish prey organisms, and predator fish from four locations in the river system. whitehall reservoir is an impoundment upstream of the site, and reservoir #2 is an impoundment downstream of the site. cedar street is a flowing reach upstream of the site, and sherman bridge is a flowing reach downstream of the site. collections of material for analysis were made ... | 2003 | 12858964 |
| morphology predicts suction feeding performance in centrarchid fishes. | suction feeding fish differ in their capacity to generate subambient pressure while feeding, and these differences appear to relate to morphological variation. we developed a morphological model of force transmission in the fish head and parameterized it with measurements from individual fish. the model was applied to 45 individuals from five species of centrarchid fishes: lepomis macrochirus, lepomis punctatus, lepomis microlophus, micropterus salmoides and pomoxis nigromaculatus. measurements ... | 2004 | 15472018 |
| determination of select antidepressants in fish from an effluent-dominated stream. | increasing evidence indicates widespread occurrence of pharmaceuticals and personal care products (ppcps) in municipal effluent discharges and surface waters. studies that characterize the fate and effects of ppcps in aquatic systems are limited, and to our knowledge, data regarding pharmaceutical accumulation in fish of effluent-dominated ecosystems have not been previously reported. in the present study, fish populations were sampled from a reference stream and an effluent-dominated stream in ... | 2005 | 15720009 |
| factors controlling mercury and methylmercury concentrations in largemouth bass (micropterus salmoides) and other fish from maryland reservoirs. | the concentration of mercury (hg) and methylmercury (mehg) was determined for largemouth bass (micropterus salmoides), bluegill (lepomis macrochirus) and black crappie (pomoxis nigromaculatus) from maryland reservoirs. overall, there was a large difference in normalized bass mehg concentration (for fish of approximately 370 mm) between the reservoirs, ranging from <100 ng g(-1) to almost 800 ng g(-1). furthermore, the relationship between fish weight and mehg concentration varied substantially b ... | 2005 | 16205988 |
| variations in pcb concentrations between genders of six warmwater fish species in lake logan martin, alabama, usa. | we collected and analyzed 955 individual fish (six species) for sexual differences in pcb bioaccumulations from a southeastern, usa reservoir. using 2-way ancovas, we found significant differences in fillet pcb concentrations between sexes for channel catfish (ictalurus punctatus), largemouth bass (micropterus salmoides) and spotted bass (micropterus punctulatus). striped bass (morone saxatilus), black crappie (pomoxis nigromaculatus) and freshwater drum (aplodinotus grunniens) did not display d ... | 2007 | 17490714 |
| dynamics of nest defense by male centrarchid fish. | field observations were conducted on four species of nesting male centrarchids to determine if guarding males discriminate intruders with respect to their potential threat to the brood, their size or position in the water column, or by the stage of the nest. results demonstrated that bluegill (lepomis macrochirus) and pumpkinseed (l. gibbosus) sunfish were the most frequent intruders and were attacked the most often. nest guarding male largemouth bass (micropterus salmoides) attacked intruders f ... | 1988 | 24896907 |
| acanthocephala from lake fishes in wisconsin: ecology and host relationships of pomphorhynchus bulbocolli (pomphorhynchidae). | pomphorhynchus bulbocolli linkins in van cleave, 1919, was considerably more common in fishes of the river-connected tichigan lake than of the landlocked silver lake, southeastern wisconsin. it is reported from 17 species of principal, accessory, and occasional definitive hosts (new record in moxostoma carinatum) and from 13 species of paratenic hosts (new records in amia calva, ictalurus punctatus, lepomis cyanellus, and pomoxis nigromaculatus). infection patterns were influenced by fish specie ... | 1987 | 3585622 |
| tissue alkaline phosphatase activity in selected freshwater teleosts. | 1. kinetic studies of tissue alkaline phosphatase activity were carried out on eight species of teleost fishes taken from the mississippi river. 2. liver alkaline phosphatase activity expressed in mumoles of p-nitrophenol released per minute per gram of protein were as follows: micropterus salmoides, 20.31; stizostedion vitreum, 19.22; pomoxis nigromaculatus, 18.76; lepisosteus platostomus, 16.26; esox lucius, 16.14; hiodon tergisus, 13.83; ictalurus punctatus, 10.87; aplodinotus grunniens, 7.94 ... | 1978 | 318337 |
| variations in the microcystin content of different fish species collected from a eutrophic lake. | microcystins produced from cyanobacteria can accumulate in fish tissues. liquid chromatography coupled with tandem quadrupole mass spectrometry (lc-ms/ms) is an attractive alternative to immunoassays for the determination of low concentrations of microcystins in tissues. fish taken from grand lake st. marys, a eutrophic lake in ohio, usa, were analyzed for microcystin-lr in their fillets using lc-ms/ms. of 129 fish tested for microcystins, only black crappie (pomoxis nigromaculatus) and common c ... | 2013 | 23676698 |