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Showing 1 to 19 of 19 for “"Villosa iris"”.
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Energy Reserves in Native Freshwater Mussels (Bivalvia:Unionidae) with and without Attached Zebra Mussels: Effects of Food Deprivation
… budgets were established for the rainbow mussel, Villosa iris (Lea, 1829), using radio-labelled cultures of Neochloris oleoabundans (Chantanachat and Bold 1962) at three cell concentrations. Assimilation efficiencies for Villosa iris at 100,000cells/ml, 10,000 cells/ml, and 1,000 cells/ml were …
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Evaluating the Feasibility of Rearing Juvenile Freshwater Mussels in a Flow-Through Pond System at White Sulphur Springs National Fish Hatchery
… environment for juvenile freshwater mussels of Villosa iris and Lampsilis fasciola. Survival did not differ significantly (p = 0.1910) over 93 d for V. iris cultured with silt (mean 49.8% ± SD 14.5) and without (mean 32.9% ± SD 11.7). Survival differed significantly (p <0.0001) between juveniles …
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The Respiratory Physiology and Energy Metabolism of Freshwater Mussels and Their Responses to Lack of Oxygen
… different biochemical strategies were used by Villosa iris, Elliptio complanata, and Pyganodon grandis. Villosa iris had the lowest anaerobic capacity. Elliptio complanata had a more efficient anaerobic metabolism, and P. grandis reduced energy metabolism under low DO and air exposure. …
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Evaluation of the Effects of Mining Related Contaminants on Freshwater Mussels (Bivalvia: Unionidae) in the Powell River of Virginia and Tennessee
… juvenile mussels, including one common species (Villosa iris) and one endangered species (Epioblasma capsaeformis). No significant differences in overall survival between treatments and control were observed for either species over a 70 day test period. Total growth was not significantly …
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A study of holding conditions, feed ration, and algal foods for the captive care of freshwater mussels
… of algae cleared by the rainbow mussel, <i>Villosa iris</i> (Lea, 1829) fed different algal rations, and estimated the algae concentration needed to maintain mussels in captivity. Filtration rate in the first feeding hour was highest in ration B (1.0 mg dry wt L⁻¹) and lowest in ration C …
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Approaches for assessing toxicity of selected contaminants to freshwater mussels (Bivalvia: Unionidae)
… during acute bioassays with glochidia. Villosa iris 3-mo old juveniles were found to be quite sensitive to Hg as growth was significantly impaired at 8 ppb Hg. Chronic bioassays with TRC revealed a distinct decrease in susceptibility with increased aged for V. iris (relative …
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Acquired and Cross Immunity of Largemouth Bass (Micropterus Salmoides) to the Glochidia Larvae of Unionid Mussels
… Transformation success of Lampsilis abrupta, Villosa iris, and Utterbackia imbecillis was significantly reduced on fish primed with L. reeveiana, indicating cross immunity across genera and subfamilies. Antibodies from primed fish recognized proteins of similar molecular weight from L. …
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A Quantitative Survey of the Freshwater Mussel (Unionidae) Fauna in Honeoye Creek, New York
… Lampsilis siliquoidea, Strophitus undulatus, and Villosa iris. Physical and chemical habitat parameters were assessed at each of the 20 sites sampled for mussels. Instream cover, embeddedness, velocity/depth regime, and frequency of riffles were positively correlated to mussel density. …
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Immunological responses of fishes to glochidia of freshwater mussels
… using glochidia of the Alabama rainbow mussel (Villosa iris). Tested host species was the rock bass (Ambloplites rupestris) and non-host fishes were common carp (Cyprinus carpio) and goldfish (Carassius auratus). Ouchterlony double-diffusion tests showed that both the host and non-host species …
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Propagation and monitoring of freshwater mussels released into the Clinch and Powell rivers, Virginia and Tennessee
… metamorphosed juveniles of the rainbow mussel (Villosa iris) reared in a substrate of fine sediment and one-month-old juveniles of wavy-rayed lampmussel (Lampsilis fasciola) fed on natural food in pond water. Bio-filter media greatly increased water quality by reducing the concentration of …
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Experiments to culture juvenile freshwater mussels in small tanks, floating containers and sediment beds
… metamorphosed juveniles of the rainbow mussel (Villosa iris). Tanks and floating containers were used outdoors, and sediment beds and floating containers were used in indoor culture experiments. Culture experiments with indoor sediment beds produced modest growth rates and variable survival …
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Evaluation of Diet, Gametogenesis, and Hermaphroditism in Freshwater Mussels (Bivalvia: Unionidae)
… tissue histological sections from gonads of Villosa iris and Utterbackia imbecillis were evaluated. Occurrences of oogenic, spermatogenic, and hermaphroditic tissues were summarized in frequency tables. Visceral sites from which similar tissues were collected from conspecific specimens were …
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Coal waste deposition and the distribution of freshwater mussels in the Powell River, Virginia
… with percent coal. Juvenile mussels of Villosa iris were placed on several types of substratum to determine differences in survival. In laboratory experiments, survival of juveniles on coal silt sometimes did not differ from that of juveniles without substratum (survival close to 100%). …
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Development of an Algal Diet for Rearing Juvenile Freshwater Mussels (Unionidae)
Feeding selectivity by the rainbow mussel (Villosa iris) was examined for three age groups; 2-3 days old, 50-53 days old, and 3-6 years old. The mussels were fed an algal diet consisting of Scenedesmus quadricauda (22.3 - 44.5 μm), Nannochloropsis oculata (2.8 – 8.1 μm), and Selenastrum …
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An Ecotoxicological Evaluation of the North Fork Holston River below Saltville, Virginia and Identification of Potential Stressors to Freshwater Mussels (Bivalvia:Unionidae)
… mg/kg). Acute tests with juveniles of Villosa iris and <24-hr old Ceriodaphnia dubia were used to measure the toxicity of the brine discharge, which had a conductivity of ~ 14,000 µS/cm. Results of these tests indicated C. dubia to be more sensitive than V. iris; however, chronic …
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Assessment of Mussel Declines in the Clinch and North Fork Holston Rivers Using Histological Evaluations of Vital Organs
… digestive glands, kidneys, and gonads) of adult Villosa iris exposed to environmentally relevant concentrations of K⁻ (4 and 8 mg/L), Cl⁻ (230 and 705 mg/L), and NH₃-N (0.014 and 0.15 mg/L) using histological evaluations. No detectable differences were observed among the histological endpoints …
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Development of a diet for rearing juvenile freshwater mussels
… in survival and growth of the rainbow mussel (Villosa iris) and giant floater (Pyganodon grandis). After 45 days post-metamorphosis, juvenile V. iris fed algae with silt exhibited a two-fold increase in shell length (532 μm), and 63.5% survival. Juvenile P. grandis exhibited similar results at …
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An Evaluation of the Survival and Growth of Juvenile and Adult Freshwater Mussels at the Aquatic Wildlife Conservation Center (AWCC), Marion, Virginia
… the AWCC. In fall 2002, four species of mussels, Villosa iris, V. vanuxemensis, Amblema plicata, and Pleurobema oviforme, served as surrogates for endangered species and were relocated to the AWCC. Three energy reserves (glycogen, protein, and lipid) were measured seasonally (fall 2002 to summer …
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Toxicity of zinc, copper, and sediments to early life stages of freshwater mussels in the Powell River, Virginia
… were obtained for glochidia of the rainbow (Villosa iris), with LC50 values ranging from 577 to 4123 μg Zn/L. Juveniles were more sensitive, with 48-hr LC50 values ranging from 360 to 1885 μg Zn/L for A. pectorosa, and 339 to 1122 μg Zn/L for V. iris, depending on test conditions. Juvenile …