Results 31 to 40 of about 519,530 (231)

Sperm Lipid Composition in Early Diverged Fish Species: Internal vs. External Mode of Fertilization

Biomolecules, 2020
The lipid composition of sperm membranes is crucial for fertilization and differs among species. As the evolution of internal fertilization modes in fishes is not understood, a comparative study of the sperm lipid composition in freshwater ...
Kathrin M. Engel, Viktoriya Dzyuba, Alexandre Ninhaus-Silveira, Rosicleire Veríssimo-Silveira, Dirk Dannenberger, Jürgen Schiller, Christoph Steinbach, Borys Dzyuba   +7 more
doaj   +1 more source

Testicular Morphology and Spermatogenesis in Potamotrygon motoro: Insights Into Reproduction of Freshwater Stingrays. [PDF]

J Morphol
ABSTRACT This study investigated the spermatogenesis of the freshwater stingray Potamotrygon motoro using microscopic analyses. The testes of this species were described as being composed of germinal zones, a degenerated zone, and the epigonal organ, consisting of connective
Delgado MLR, Quirino PP, Gomes-Silva L, Dzyuba V, Dzyuba B, Ninhaus-Silveira A, Veríssimo-Silveira R.   +6 more
europepmc   +3 more sources

Morphological aspects and germ cells of male reproductive tract of river stingray, Potamotrygon amandae

Acta Scientiarum: Biological Sciences, 2023
The family Potamotrygonidae are the only species of stingrays restricted to fresh water and located exclusively in South America. The objective of this research was to analyze the morphological aspects and germ cells of the male reproductive tract of ...
Stefhani Cristina Chan Jacik, Julia Bastos de Aquino, Luana Felix de Melo, Rosângela Felipe Rodrigues, Alan Peres Feraz de Melo, Maria Angélica Miglino, Rose Eli Grassi Rici   +6 more
doaj   +1 more source

Reproductive cycle, nutrition and growth of captive blue spotted stingray, Dasyatis kuhlii (Dasyatidae) [PDF]

, 2010
At Burgers' Ocean 7 male and 3 female blue spotted stingrays, Dasyatis kuhlii were born over a period of 4.5 years. This paper describes the experiences of the captive breeding results of this species. The first two young died within 2 days of birth. One
Janse, M., Schrama, J.W.
core   +1 more source

StingraySoftware/stingray: Version 1.0

, 2022
TL,DR: These things will break your code with v1.0: Python version < 3.8 The gtis keyword in pulse/pulsar.py (it is now gti, without the 's') New Dropped support to Python < 3.8 Multi-taper periodogram, including a Lomb-Scargle implementation for non ...
Abbie Stevens, parkma99, Swapnil Sharma, Haroon Rashid, Sashank Mishra, Matteo Bachetti, Paul Balm, Saurav Sachidanand, Dhruv Vats, Amogh Desai, Himanshu Mishra, Brigitta Sipőcz, Evandro Martinez Ribeiro, Stuart Mumford, Daniela Huppenkothen, Rashmi Raj, John Swinbank, Achilles Rasquinha, Nick, Meg Davis, Max Mahlke, omargamal8, Riccardo Campana, Arfon Smith, Akash Tandon, Anurag Hota, Usman Khan, tappina, Mihir, Nitish Garg   +29 more
core   +1 more source

Study of the integument that covering back and stinger of the freshwater stingray Potamotrygon rex (Chondricthyes, Potamotrygonidae).

Brazilian journal of biology = Revista brasleira de biologia, 2022
The objective of this study was to describe the histology and histochemistry of the integument covering the back and stinger of the freshwater stingray Potamotrygon rex, endemic to the Middle Upper Tocantins River.
D. G. Ribeiro-Neto, D. Spadacci-Morena, E. E. Marques, K. L. F. Silva, C. S. Seibert   +4 more
semanticscholar   +1 more source

Electroreception in the obligate freshwater stingray, Potamotrygon motoro [PDF]

Marine and Freshwater Research, 2015
Elasmobranch fishes use electroreception to detect electric fields in the environment, particularly minute bioelectric fields of potential prey. A single family of obligate freshwater stingrays, Potamotrygonidae, endemic to the Amazon River, demonstrates morphological adaptations of their electrosensory system due to characteristics of a high impedance
Lindsay L. Harris, Christine N. Bedore, Stephen M. Kajiura   +2 more
openaire   +1 more source

Eugenol and Lippia alba essential oils as effective anesthetics for the Amazonian freshwater stingray Potamotrygon wallacei (Chondrichthyes, Potamotrygonidae)

Fish Physiology & Biochemistry, 2021
This study assessed the potential of eugenol and the essential oil of Lippia alba (EOLA) in providing suitable anesthetic induction and recovery times, and their consequent effects on the blood and respiratory physiology, as well as the gill architecture
Cristiano L. de Lima, Ruben Dario Morales-Gamba, T. Malcher, J. Barcellos, B. Heinzmann, Denise Schmidt, B. Baldisserotto, J. Marcon   +7 more
semanticscholar   +1 more source

Ecological and Phenotypic Diversification after a Continental Invasion in Neotropical Freshwater Stingrays

Integrative and Comparative Biology, 2022
AbstractHabitat transitions are key potential explanations for why some lineages have diversified and others have not—from Anolis lizards to Darwin's finches. The ecological ramifications of marine-to-freshwater transitions for fishes suggest evolutionary contingency: some lineages maintain their ancestral niches in novel habitats (niche conservatism),
Kolmann, M., Marques, F., Weaver, J., Dean, M. ; https://orcid.org/0000-0002-5026-6216, Fontenelle, J., Lovejoy, N.   +5 more
openaire   +3 more sources

A comparison of the effects of environmental ammonia exposure on the Asian freshwater stingrayHimantura signiferand the Amazonian freshwater stingrayPotamotrygon motoro [PDF]

Journal of Experimental Biology, 2003
SUMMARYThe white-edge whip tail ray Himantura signifer inhabits a freshwater environment but has retained the capability to synthesize urea de novo through the arginine-ornithine-urea cycle (OUC). The present study aimed to elucidate whether the capacity of urea synthesis in H. signifer could be upregulated in response to environmental ammonia exposure.
Ip, Y.K., Tam, W.L., Wong, W.P., Loong, A.M., Hiong, K.C., Ballantyne, J.S., Chew, S.F.   +6 more
openaire   +2 more sources