Results 91 to 100 of about 18,439 (295)

Catálogo de ejemplares tipo de la colección ictiológica del Museo de La Plata. Adenda 2015 [PDF]

, 2015
Fil: Miquelarena, Amalia María. División Zoología Vertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Nadalin, Diego Oscar. División Zoología Vertebrados.
Miquelarena, Amalia María, Nadalin, Diego Oscar   +1 more
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The efficiency of spermatogenesis and the support capacity of Sertoli cells in Characiformes [PDF]

Theriogenology, 2017
This stereological analysis of the types of germ cells and the number of Sertoli cells per cyst in Astyanax altiparanae testes during spermatogenesis is the first such report in Characiformes. Testes of 25 male A. altiparanae were examined. Based on the number of spermatogonia B per cyst (469.2 ± 9.92), we estimated that spermatogonia undergo at least ...
Rodrigues, Maira da Silva, Siqueira-Silva, Diógenes Henrique de, Quirino, Patrícia Postingel, Ninhaus-Silveira, Alexandre, Veríssimo-Silveira, Rosicleire   +4 more
openaire   +4 more sources

Fish distribution across altitudinal gradients in the Upper Paraguay River Basin: Implications for conservation in the Pantanal region

Conservation Science and Practice, Volume 7, Issue 7, July 2025.
This paper approaches the patterns in fish distribution across the altitudinal gradient in the Upper Paraguay River basin, from uplands to the floodplain. We compiled more than 75,000 available fish records and registered 342 fish species and your distribution along altitudinal gradient. Floodplain portion have higher species diversity than headwaters,
Adriana Maria Espinoza Fernando, Francisco Severo‐Neto, Fabiane Silva Ferreira, Lúcia Mateus, Karina K. Tondato‐Carvalho, Elaine Antoniassi Luiz Kashiwaqui, Heriberto Gimenes Junior, Wladimir M. Domingues, Carla Simone Pavanelli, Henrique Ledo Lopes Pinho, Jerry Penha, Yzel Rondon Súarez   +11 more
wiley   +1 more source

Phylogeny of the Serrasalmidae (Characiformes) based on mitochondrial DNA sequences [PDF]

Genetics and Molecular Biology, 2008
Previous studies based on DNA sequences of mitochondrial (mt) rRNA genes showed three main groups within the subfamily Serrasalminae: (1) a "pacu" clade of herbivores (Colossoma, Mylossoma, Piaractus); (2) the "Myleus" clade (Myleus, Mylesinus, Tometes, Ossubtus); and (3) the "piranha" clade (Serrasalmus, Pygocentrus, Pygopristis, Pristobrycon ...
Ortí, Guillermo, Sivasundar, Arjun, Dietz, Kelly, Jégu, Michel   +3 more
openaire   +5 more sources

Antagonistic Rewiring and Turnover Patterns in a Neotropical Fish–Parasite Metanetwork

Freshwater Biology, Volume 70, Issue 7, July 2025.
ABSTRACT Integrating beta‐diversity and network analyses is an emerging approach for understanding the spatial structure of species communities. For instance, although the presence of hosts affects parasite species distribution, environmental factors can either restrict or promote the occurrence of certain parasite species by changing the abundance of ...
Ana Paula Lula Costa, Paulo R. Guimarães, Andre A. Padial   +2 more
wiley   +1 more source

Trends in chromosome evolution of neotropical characiform fishes [PDF]

Caryologia, 1994
SUMMARYNeotropical characiform fishes present two main trends of chromosomal evolution: some taxa show a heterogeneous pattern, with an extensive numerical and structural variation while others show a more homogeneous one, with a clear stability in their karyotype macrostructure.
Luis Antônio Carlos Bertollo, Orlando Moreira-Filho, Pedro M. Galetti   +2 more
openaire   +2 more sources

Larger Fish Upstream: Testing the Drivers of Fish Longitudinal Size Distribution in a Stream

Freshwater Biology, Volume 70, Issue 7, July 2025.
ABSTRACT The “larger fish upstream pattern” (LFUP), where fish size increases from river mouths toward headwaters, is widely documented, but the drivers remain unclear. Here, we tested whether LFUP is related to species reproductive strategies or environmental factors (differential growth, predation, competition). Using historical data (1994–1998) from
Pedro Wolf, Piatã Marques, Rosana Mazzoni   +2 more
wiley   +1 more source

A checklist of chromosome numbers and karyotypes of Amazonian freshwater fishes [PDF]

, 1992
Une liste des nombres de chromosomes de 211 espèces de poisson du bassin amazonien est présentée. Ces espèces, appartenant à 5 ordres, sont caractérisées par une grande variabilité du nombre de chromosomes (2n = 22 à 2n = 134), par la présence de ...
Falcao, J., Feldberg, E., Nakayama, C.M., Porto, J.I.R.   +3 more
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Long‐Term Effects of Land Use and Cover Change and Dam Rupture on Ichthyofauna in a Neotropical Stream

International Review of Hydrobiology, Volume 110, Issue 1, Page 5-12, June 2025.
ABSTRACT This study evaluates land use and land cover (LULC) changes and their impacts on the fish community of a neotropical stream in the Sorocaba River basin, Brazil, from 2006 to 2023. The watershed experienced landscape changes over time, categorized into four periods: rural interventions, urban interventions, restorative interventions, and post ...
Nícholas de P. Nicomedes, Thiago M. R. Santos, Luís G. N. de Carvalho, Beatriz C. G. Prieto, Camila S. Bento, Larissa L. M. Silva, Flavia C. de Paiva, Natalia S. Alves, Welber S. Smith   +8 more
wiley   +1 more source

Structure et minéralisation des écailles de quelques Characiformes de Guyane (Osteichthyes, Teleostei) [PDF]

, 1994
Les écailles de cinq espèces de Characiformes (#Leporinus friderici$, #Anastomidae$ ; #Triportheus rotundatus$, #Characidae$ ; #Curimata cyprinoides$, #Curimatidae$ ; #Hoplias aimara$, #Erythrinidae$ ; #Myleus romboidalis$, #Serrasalmidae$) ont été ...
Meunier, F.J.
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