Results 141 to 150 of about 776 (163)
Triploidy in the hematology of jundia juveniles (Siluriformes: Heptapteridae) [PDF]
Brazilian Journal of Biology, 2012 This study compared the hematological characteristics of diploid and triploid of jundia, Rhamdia quelen juveniles, an important freshwater fish cultured in south Brazil. Hematological morphometry of erythrocytes were determined in blood smears under a light microscope.
Mauricio Martins, Ricardo Bailone
exaly +6 more sources
Skin extract from Rhamdia quelen(Siluriformes: Heptapteridae) does not promote stress in conspecifics [PDF]
Neotropical Ichthyology, 2014 Chemical communication is widely used in aquatic environments, where visual or auditory signals may not be always effective. Fish of the superorder Ostariophysi are known to display epidermal cells (club cells) that produce and store alarm substances, which are released to the water when the skin is damaged.
Freire Carolina A
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Segregação alimentar entre duas espécies de Heptapteridae no Rio Macaé, RJ [PDF]
Biota Neotropica, 2009 Alimento é considerado o principal eixo da partilha de nicho entre peixes, sendo um fator importante para a organização de suas populações. Com o intuito de investigar essa assertiva para duas espécies filogeneticamente próximas, a dieta natural de dois peixes da família Heptapteridae, Rhamdioglanis transfasciatus e Rhamdia quelen foi caracterizada e ...
Brazil-Sousa, Clarissa +2 more
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Archives of Environmental Contamination and Toxicology, 2019
Substances derived from anthropogenic activities induce changes in the physical and chemical characteristics of the aquatic environment. Physicochemical and biological studies are necessary to understand how changes in landscape affect the health of the aquatic environment.
Vreys, Natalia +5 more
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Substances derived from anthropogenic activities induce changes in the physical and chemical characteristics of the aquatic environment. Physicochemical and biological studies are necessary to understand how changes in landscape affect the health of the aquatic environment.
Vreys, Natalia +5 more
openaire +3 more sources
Intraspecific chromosome analysis in Rhamdia quelen (Siluriformes, Heptapteridae)
2010We studied the chromosomes of Rhamdia quelen. All specimens presented 2n = 58 and 36m+16sm+6st and FN = 116 and showed metacentric B chromosomes of medium size. The specimens from Água dos Patos river, Água das Pedras river and fish farm station showed a secondary constriction in the short arm of pair 28 (st), coincident with the NOR, while in the ...
Oliveira de Moraes, Vivian Patricia +2 more
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Phylogeny and Classification of Heptapteridae (Pimelodoidea)
Veronica Slobodian +1 moreexaly +2 more sources
Archives of Environmental Contamination and Toxicology, 2007
The present study evaluated the effect of waterborne Cd in eggs and larvae of silver catfish, Rhamdia quelen, at two alkalinity levels (63 and 92 mg . L(-1) CaCO(3)): 0.5 (control), 4.5, 8, and 18 microg . L(-1) Cd. The fertilization rate was similar in all treatments, but the number of eggs with irregular surface was significantly higher in those ...
Ana Paula S, Benaduce +4 more
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The present study evaluated the effect of waterborne Cd in eggs and larvae of silver catfish, Rhamdia quelen, at two alkalinity levels (63 and 92 mg . L(-1) CaCO(3)): 0.5 (control), 4.5, 8, and 18 microg . L(-1) Cd. The fertilization rate was similar in all treatments, but the number of eggs with irregular surface was significantly higher in those ...
Ana Paula S, Benaduce +4 more
openaire +2 more sources
Anatomia, Histologia, Embryologia, 2012
SummaryThe morphology of the ovaries and oogenesis of Pimelodella vittata were studied using anatomical and histological techniques to provide information of its reproductive biology. Eighty adult females were captured trimonthly during the period November 2005 to October 2006.
N G, Sales +4 more
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SummaryThe morphology of the ovaries and oogenesis of Pimelodella vittata were studied using anatomical and histological techniques to provide information of its reproductive biology. Eighty adult females were captured trimonthly during the period November 2005 to October 2006.
N G, Sales +4 more
openaire +2 more sources
Ecological Modelling, 2017
Abstract It is well known that the early life cycle stages of fishes are highly sensitive to chemical exposure. However, little is known about the effects of pollutants on the other life stages, due the difficulty of experimental/empirical approaches.
Izabella de Andrade Brito +3 more
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Abstract It is well known that the early life cycle stages of fishes are highly sensitive to chemical exposure. However, little is known about the effects of pollutants on the other life stages, due the difficulty of experimental/empirical approaches.
Izabella de Andrade Brito +3 more
openaire +1 more source
Two new species of Heptapterus (Siluriformes: Heptapteridae) from the Uruguay River basin, Brazil
Journal of Fish Biology, 2019As part of an ongoing taxonomic revision of the genus Heptapterus from the Laguna dos Patos and Uruguay River drainages and Atlantic coastal streams of southern Brazil and Uruguay, two new species closely related to Heptapterus mustelinus were identified. Both species are endemic to small tributaries of the Uruguay River.
Dario R. Faustino‐Fuster +2 more
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