Results 81 to 90 of about 3,578 (213)

Potential metabolic records in isotope signals of chondrichthyan hard tissues

Journal of Fish Biology, Volume 107, Issue 3, Page 1001-1017, September 2025.
Abstract Recent advances have demonstrated that the field metabolic rates (FMRs) of teleost fishes can be quantified from stable isotope compositions of carbonate‐biomineralized otoliths. Bones and teeth, in addition to bioapatite, contain carbonate and should retain a similar isotopic expression of metabolic rate.
Eric Díaz‐Delgado, Ming‐Tsung Chung, Sarah Magozzi, Trevor J. Willis, Clive N. Trueman   +4 more
wiley   +1 more source

Mitochondrial genetic variation of endemic stingray Potamotrygon magdalenae (Myliobatiformes: Potamotrygonidae) in the middle Magdalena River basin, Colombia

Neotropical Ichthyology
Potamotrygon magdalenae is the only freshwater stingray species reported to be endemic to Colombia, inhabiting the Magdalena-Cauca, San Jorge, Atrato, and Catatumbo River basins.
Carlos Arturo Amado-García, Iván Yesid López-Ardila, Fernando Rondón-González   +2 more
doaj   +1 more source

An unusual, dwarf new species of Neotropical freshwater stingray, Plesiotrygon nana sp. nov., from the upper and mid Amazon basin: the second species of Plesiotrygon (Chondrichthyes: Potamotrygonidae)

Papéis Avulsos de Zoologia, 2011
A new species of the relatively poorly known Neotropical freshwater stingray genus Plesiotrygon Rosa, Castello & Thorson, 1987 is described from the main channel and smaller tributaries (Ríos Itaya and Pachitea) of the upper Amazon basin in Peru.
Marcelo R. de Carvalho, Maíra P. Ragno
doaj   +1 more source

Guide to the development of Myanmar's National Plan of Action for the conservation and management of sharks [PDF]

, 2015
The priorities for the revised National Plan of Action include: strengthening current regulations; improved data collection of landings; identifying breeding and nursery grounds; study of ecology and biology of sharks; improved data acquisition of shark ...

core  

Temperature‐dependent alterations in the proteome of the emergent fish pathogen Edwardsiella piscicida

Journal of Fish Diseases, Volume 48, Issue 9, September 2025.
Abstract Edwardsiella piscicida is an emerging bacterial pathogen and the aetiological agent of edwardsiellosis among cultured and wild fish species globally. The increased frequency of outbreaks of this Gram‐negative, facultative intracellular pathogen pose not only a threat to the aquaculture industry but also a possible foodborne/waterborne public ...
Kim L. Jacobsen, Matt Griffin, Brett S. Phinney, Michelle Salemi, Zeinab Yazdi, Sujita Balami, Caitlin E. Older, Esteban Soto   +7 more
wiley   +1 more source

Diversification and species boundaries of Rhinebothrium (Cestoda; Rhinebothriidea) in South American freshwater stingrays (Batoidea; Potamotrygonidae).

PLoS ONE, 2011
BackgroundNeotropical freshwater stingrays (Batoidea: Potamotrygonidae) host a diverse parasite fauna, including cestodes. Both cestodes and their stingray hosts are marine-derived, but the taxonomy of this host/parasite system is poorly understood ...
Florian B Reyda, Fernando P L Marques
doaj   +1 more source

Assessing the ecological recovery of shellfish reefs following restoration in southern Australia

Restoration Ecology, Volume 33, Issue 7, September 2025.
Shellfish reefs are among the most degraded of all coastal habitats due mainly to historical wild commercial harvest, sedimentation, introduced species, and disease. Until the 20th century, most estuaries and bays across southern Australia contained shellfish reefs. Efforts to restore these endangered ecosystems commenced in the mid‐2010s.
Elisa Bayraktarov, Vera Rullens, Brenten Sandry, Fiona Valesini, James A. Fitzsimons, Simon Branigan, Paul Hamer, Anita Thomas, Francisco Martinez‐Baena, Boze Hancock, Ben Cleveland, Chris Gillies, Simon E. Reeves   +12 more
wiley   +1 more source

A survey of coccidian infection (Apicomplexa: Eimeriidaea) of freshwater fish in South Africa [PDF]

, 2005
Fish coccidia, especially Goussia and Eimeria spp., are common and frequent parasites of fish. The majority of the known species has been described from the Eurasian continent.
Avenant-Oldewage, Annemarie, Molnár, Kálmán, Székely, Csaba   +2 more
core  

Spatiotemporal eDNA Monitoring of Marine Biodiversity in a Hyperurbanised Coastal Environment

Environmental DNA, Volume 7, Issue 4, July–August 2025.
Using environmental DNA and a metabarcoding approach, we amplified and sequenced the cytochrome oxidase subunit I (COI) gene for invertebrates and the 16S rRNA gene for vertebrates. Our spatiotemporal analyses over a year and across four sites in Singapore revealed distinct communities between sites and timepoints for both the COI and 16S rRNA assays ...
Zhi Ting Yip, Zheng Bin Randolph Quek, Danwei Huang   +2 more
wiley   +1 more source

On the liver tissue of freshwater stingrays and balloonfish.

NIPPON SUISAN GAKKAISHI, 1985
Using the freshwater stingrays Potamotrygon spp. and the balloonfish Diodon holacanthus, an investigation was carried out on the liver size and the amount of fat droplets in hepatocytes and the following results were obtained. The liver of the stingrays was relatively small in size among Chondrichthyes and the value of hepatosomatic index (HSI) on six ...
openaire   +2 more sources