Results 81 to 90 of about 996 (161)

Gill dimensions in near-term embryos of Amazonian freshwater stingrays (Elasmobranchii: Potamotrygonidae) and their relationship to the lifestyle and habitat of neonatal pups

Neotropical Ichthyology
This comparative study of gill morphometrics in near-term embryos of freshwater stingray potamotrygonids examines gill dimensions in relation to neonatal lifestyle and habitat.
Wallice Paxiúba Duncan, Maria Isabel da Silva, Marisa Narciso Fernandes   +2 more
doaj   +1 more source

Record of the freshwater stingrays Potamotrygon brachyura and P. motoro (Chondrichthyes, Potamotrygonidae) in the lower Uruguay river, South America Registro das raias de água doce Potamotrygon brachyura e P. motoro (Potamotrygonidae) no baixo rio Uruguai, America do Sul

Acta Amazonica, 2012
Freshwater stingrays, or potamotrygonids, are restricted to Neotropical river drainages. These elasmobranchs are well adapted to freshwater environments and the number of described species gradually increases as further research is carried out.
María Cristina Oddone, Gonzalo Velasco, Patricia Charvet   +2 more
doaj   +1 more source

Технології культивування річкового кільцевого ската (Potamotrygon motoro, Müller & Henle, 1841) в штучних умовах [PDF]

Бакалаврська кваліфікаційна робота Кузнєцова Ю.В. за темою: «Технології культивування річкового кільцевого ската (Potamotrygon motoro, Müller & Henle, 1841) в штучних умовах» складається з 68 сторінок, 4 таблиці та 15 рисунків.
Кузнєцов, Юрій Володимирович
core  

Isolation of a zoonotic pathogen Aeromonas hydrophila from freshwater stingray (Potamotrygon motoro) kept in a Korean aquarium with ricefish (Oryzias latipes)

, 2017
In the present study, Aeromonas (A.) hydrophila was isolated from a captive-bred adult freshwater stingray (Potamotrygon motoro) reared at a commercial aquarium in Korea.
Kim, Sang Wha, Jun, Jin Woo, Hyoun Joong Kim, Kim, Sang Guen, Park, Se Chang, Yun, Saekil, Giri, Sib Sankar, Kim, Hyoun Joong, Sib Sankar Giri, Chi, Cheng, Sang Guen Kim, Lee, Young-Ran, Saekil Yun, Cheng Chi, Jin Woo Jun, Se Chang Park, Young-Ran Lee, Sang Wha Kim   +17 more
core   +1 more source

Activity and habitat use of two species of stingrays (Myliobatiformes: Potamotrygonidae) in the upper Paraná River basin, Southeastern Brazil

Neotropical Ichthyology
The life history of freshwater stingrays (Potamotrygonidae) under natural conditions has been poorly documented. In this study, we investigated theperiod of activity and the habitat use of two species of the genus Potamotrygon in the upper Paraná River ...
Domingos Garrone Neto, Virgínia Sanches Uieda   +1 more
doaj   +1 more source

Phylogeography and conservation genetics of the Amazonian freshwater stingray Paratrygon aiereba Müller & Henle, 1841 (Chondrichthyes: Potamotrygonidae)

Neotropical Ichthyology
The family Potamotrygonidae is monophyletic comprising three genera: Paratrygon Duméril, Potamotrygon Garman and Plesiotrygon Rosa, Castello & Thorson.
Renata G. Frederico, Izeni P. Farias, Maria Lúcia Góes de Araújo, Patricia Charvet-Almeida, José A. Alves-Gomes   +4 more
doaj   +1 more source

The more stirring the better: cichlid fishes associate with foraging potamotrygonid rays

Neotropical Ichthyology
One hunting tactic of freshwater rays (Potamotrygonidae), termed "undulate the disc and stir substrate", is here reported to attract cichlids at two sites in the upper Paraná River.
Domingos Garrone-Neto, Ivan Sazima
doaj   +1 more source

Biometria e dimorfismo sexual de Argulus juparanaensis (Argulidae), um parasito de Potamotrygon motoro (Potamotrygonidae). [PDF]

, 2018
Argulus juparanaensis é encontrado parasitando Potamotrygon motoro da bacia do Rio Amazonas, e parece ter forte relação com esse hospedeiro. O gênero Potamotrygon abriga 21 espécies, indivíduos adaptados à água doce, mas algumas espécies suportam ...
TAVARES-DIAS, M., BORGES, W. F., SILVA, P. H. E. da, OLIVEIRA, M. S. B.   +3 more
core  

Fig. 6 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

, 2011
Fig. 6. Somatic metaphases of Potamotrygon aff. motoro, the population of Porto Rico (a), population of Ilha Solteira (b), identification of constitutive heterochromatin. Metaphases of Potamotrygon falkneri sample from Porto Rico (c) and Ilha Solteira (d)
Oliveira, Claudio, Shimabukuro-Dias, Cristiane Kioko, Cruz, Vanessa Paes da, Foresti, Fausto   +3 more
core   +1 more source

Karyotype description and evidence of multiple sex chromosome system X1X1X2X2/X1X2Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Neotropical Ichthyology
Cytogenetic analysis of Potamotrygon aff. motoro and P. falkneri indicated the occurrence of an X1X1X2X2/X1X2 Y multiple sex chromosome system in both species, with 2n = 66 chromosomes for females and 2n = 65 chromosomes for males.
Vanessa Paes da Cruz, Cristiane Kioko Shimabukuro-Dias, Claudio Oliveira, Fausto Foresti   +3 more
doaj   +1 more source