Results 121 to 130 of about 311 (149)
Filogeografía de Rhamdia quelen (Siluriformes, Heptapteridae) en las cuencas del Uruguay
, 2023 openaire +1 more source
Zoologica Scripta, 2021 AbstractHeptapteridae is composed of 228 valid species allocated in 24 genera, making it the most diverse family within superfamily Pimelodoidea, a clade endemic to the Neotropical freshwaters. Heptapterids are widely distributed from southern Mexico to the Pampas of Argentina and occupy a variety of habitats generally in small‐ to medium‐sized rivers.
Gabriel S C Silva +2 more
exaly +3 more sources
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.
Ricardo Lacava Bailone +1 more
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.
Carolina A Freire
exaly +6 more sources
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 ...
Clarissa Brazil-Sousa +1 more
exaly +4 more sources
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A new species of Pimelodella (Siluriformes: Heptapteridae) from the Guiana Shield, Brazil
Zootaxa, 2017A new species of Pimelodella is described from the Rio Ipitinga, Rio Jari basin, a left bank tributary of the Rio Amazonas in Brazil. The new species is diagnosed from all congeners by having a dark oval mark on the humeral region. It also differs from all congeners by a unique set of characters, including the presence of 47 to 49 total vertebrae ...
Slobodian, Veronica +2 more
openaire +3 more sources
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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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
openaire +2 more sources
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
Phylogeny and Classification of Heptapteridae (Pimelodoidea)
Veronica Slobodian +1 moreexaly +2 more sources