Results 51 to 60 of about 519,530 (231)

Evaluation of staining techniques for the observation of growth bands in tropical elasmobranch vertebrae

Scientia Marina, 2020
The aim of this study was to assess the suitability of different vertebrae staining techniques for the visualization and counting of growth bands in tropical species of batoids (Narcine leoparda, Urotrygon aspidura, Hypanus longus, Potamotrygon ...
José G. Pérez-Rojas, Katherine Torres-Palacios, Amalia Uribe, Andrés F. Navia, Paola A. Mejía-Falla   +4 more
doaj   +1 more source

RECTAL GLAND OF FRESHWATER STINGRAYS,POTAMOTRYGONSPP. (CHONDRICHTHYES:POTAMOTRYGONIDAE)

The Biological Bulletin, 1978
1. Contrary to some reports, a rectal gland is present in strictly freshwater stingrays of South American rivers (Potamotrygon spp.). 2. The gland has the location and histological features of the salt-secreting rectal gland of marine elasmobranchs, but is much reduced in size and number of tubules. 3. Its residual function, if any, is unknown. 4.
Thorson, Thomas B., Wotton, Robert M, Georgi, Todd A   +2 more
openaire   +4 more sources

Ascorbic Acid Biosynthesis and Brackish Water Acclimation in the Euryhaline Freshwater White-Rimmed Stingray, Himantura signifer. [PDF]

PLoS ONE, 2013
L-gulono-γ-lactone oxidase (Gulo) catalyzes the last step of ascorbic acid biosynthesis, which occurs in the kidney of elasmobranchs. This study aimed to clone and sequence gulonolactone oxidase (gulo) from the kidney of the euryhaline freshwater ...
Samuel Z H Wong, Biyun Ching, You R Chng, Wai P Wong, Shit F Chew, Yuen K Ip   +5 more
doaj   +1 more source

Mitotic Chromosome Preparations of Freshwater Stingrays

, 2015
The technique for obtaining mitotic chromosomes proposed by Foresti et al. (1981) when applied in freshwater stingrays didn’t result in good quality chromosome preparations. Only a few studies have used this technique to obtain good quality chromosomes in this fi sh group (Valentim et al. 2006; Cruz et al. 2011).
Paes da Cruz, V., Foresti, F.
openaire   +2 more sources

Fish Migration Through Ship Locks at the Danube River, Austria

River Research and Applications, EarlyView.
ABSTRACT Longitudinal connectivity in the Austrian section of the Danube has improved over the last three decades thanks to the progressive installation of fish passage facilities at hydropower plants. However, navigation locks which are present at all barrages remain poorly quantified with respect to their role in fish migration.
Walter Reckendorfer, Barbara Grüner, Renate Degen, Regina Petz‐Glechner, Ursula Scheiblechner, Michael Schabuss   +5 more
wiley   +1 more source

StingraySoftware/stingray: Version 0.1

, 2019
<p>Version 0.1 release of Stingray.</p> <p><strong>Note</strong>: This is the last version of Stingray to support Python2. Future releases will be tested using Python3 only.</p> <p>Changes to v0.1rc1:</p> &
Abbie Stevens, Swapnil Sharma, Haroon Rashid, Sashank Mishra, Matteo Bachetti, Paul Balm, Saurav Sachidanand, Ricardo Vallés Blanco, Himanshu Mishra, Parul Sethi, Evandro Martinez Ribeiro, Daniela Huppenkothen, John Swinbank, Sandeep Kumar, Achilles Rasquinha, Nick, Max Mahlke, omargamal8, Riccardo Campana, Arfon Smith, Sambhav Kothari, Akash Tandon, Anurag Hota, Usman Khan, tappina, Brigitta Sipocz, Nitish Garg   +26 more
core   +1 more source

Osteological, Biological, and Genetic Consequences of Colonization of Fresh Waters by Marine Cottoid Fishes (Cottidae)

Integrative Zoology, EarlyView.
Lacustrine forms of Triglopsis from North American and European lakes are at different stages of evolution, making them a suitable model for testing hypotheses about evolutionary patterns and rates. An integrative analysis of morphological, genetic, and biological adaptations occurring in lacustrine forms of the genus Triglopsis was carried out.
Valentina G. Sideleva, Zakhar V. Zhidkov, Nataliia V. Annenkova, Alexander G. Ryumin, Danila A. Melentev   +4 more
wiley   +1 more source

Conservation program for freshwater stingrays in the Musi River, Palembang City, South Sumatra: Stakeholders analysis and priority programs

Sustinere: Journal of Environment and Sustainability
Through the Minister of Maritime Affairs and Fisheries Decree (Kepmen KP) 01/2021, the Indonesian Government has granted full protection status for three freshwater stingray species found in the Musi River, Palembang City, South Sumatra.
Sahaya Aulia Azzahra, Pini Wijayanti, Nabila Nur Septiani, Lailatun Nikmah   +3 more
doaj   +1 more source

Molecular and morphological investigations on the renal mechanisms enabling euryhalinity of red stingray Hemitrygon akajei

Frontiers in Physiology, 2022
Most cartilaginous fishes live in seawater (SW), but a few exceptional elasmobranchs (sharks and rays) are euryhaline and can acclimate to freshwater (FW) environments. The plasma of elasmobranchs is high in NaCl and urea concentrations, which constrains
Naotaka Aburatani, Wataru Takagi, Marty Kwok-Shing Wong, Marty Kwok-Shing Wong, Shigehiro Kuraku, Shigehiro Kuraku, Shigehiro Kuraku, Chiharu Tanegashima, Mitsutaka Kadota, Kazuhiro Saito, Waichiro Godo, Tatsuya Sakamoto, Susumu Hyodo   +12 more
doaj   +1 more source

Insights into diet and niche separation in the context of prey availability between two sympatric whiprays in a tropical intertidal estuary

Journal of Fish Biology, EarlyView.
Abstract Increasing evidence supports associations between various elasmobranch species and estuarine habitats, particularly during early life stages. However, with substantial knowledge gaps surrounding spatial habitat use and trophic ecology of estuary‐associated species in Australia, we cannot reliably assess the functional importance of these areas
Jaelen Myers, Marcus Sheaves, Adam Barnett   +2 more
wiley   +1 more source