Results 51 to 60 of about 3,600 (245)

Determinação do sexo da Tuvira Gymnotus sp. através da análise de imagem de ultra-som [PDF]

, 2011
A tuvira (Gymnotus sp.) é um peixe muito conhecido no Pantanal por ser amplamente utilizado como isca viva pela pesca esportiva. Visto os problemas inerentes à sua coleta na natureza, como degradação ambiental e as condições desumanas de trabalho, faz-se
ACORCI, L. C., PEDROSO, M. F., ROTTA, M. A.   +2 more
core  

Fish fauna of headwater streams that cross the Atlantic Forest of south São Paulo state [PDF]

Check List, 2012
The fishes of the present study were collected in the headwater streams of the Sorocaba, Paranapanema and Ribeira de Iguape river basins during the dry period in 2010. A total of 2892 fishes, grouped in 53 species, were captured.
Mauricio Cetra, Walter Barrella, Francisco Neto, Abílio Martins, Bruno Mello, Rodrigo Almeida   +5 more
doaj   +3 more sources

Anthropogenic Factors Drive the Depletion of Fish Functional Β Diversity Within and Outside Two National Reserves in the Peruvian Amazon

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 35, Issue 12, December 2025.
ABSTRACT Understanding the impact of human activities on fish communities is critical for the effective conservation of Amazonian ecosystems. In this study, we sampled environmental DNA (eDNA) from 17 sites (lakes and rivers) in two Peruvian national reserves, Pacaya‐Samiria and Allpahuayo‐Mishana, using a metabarcoding approach with four genetic ...
B. Prat, C. Mariac, J.‐F. Renno, C. García‐Dávila, C. Angulo, G. Estivals, F. Duponchelle   +6 more
wiley   +1 more source

First record of supernumerary (B) chromosomes in electric fish (Gymnotiformes) and the karyotype structure of three species of the same order from the upper Paraná River basin

Comparative Cytogenetics, 2012
Cytogenetic studies were performed on the species Apteronotus prope albifrons Linnaeus, 1766, Rhamphichthys hahni Meinken, 1937 and Brachyhypopomus gauderio Giora & Malabarba, 2009, collected in the upper Paraná River floodplain, Porto Rico ...
Valéria Mendes, Ana Luiza Portela-Castro, Horácio Júlio-Júnior   +2 more
doaj   +1 more source

Fish fauna in tributaries of the Suiá-Miçú River (upper Xingu river basin), in the Cerrado-Amazon transition zone, eastern state of Mato Grosso, Brazil [PDF]

Check List, 2017
Studies on the fish fauna of the Xingu river basin are mainly concentrated in the main channel of the river or its large tributaries, due to requirements all faunal surveys in hydroelectric power plant projects.
Luciano Lima, Aline Santos, Dilermando Lima Junior   +2 more
doaj   +3 more sources

Visual and Electrosensory Circuits of the Diencephalon in Mormyrids [PDF]

, 1990
Mormyrids are one of two groups of teleost fishes known to have evolved electroreception, and the concomitant neuroanatomical changes have confounded the interpretation of many of their brain areas in a comparative context, e.g., the diencephalon, where ...
Adams, Bell, Bell, Bell, Bell, Bell, Bell, Bergquist, Braford, Bullock, Bullock, Carr, Ebbesson, Ebbesson, Echteler, Echteler, Erdl, Fiebig, Finger, Franz, Franz, Franz, Grover, Hanker, Harder, Haugede-Carre, Haugede-Carre, Holmgren, Hopkins, Hopkins, Ito, Ito, Ito, Ito, Keller, Keller, Lauder, Lazar, Luiten, Maler, Maler, McCormick, Meek, Meek, Meek, Murakami, Murakami, Murakami, Nieuwenhuys, Nieuwenhuys, Nieuwenhuys, Nieuwenhuys, Northcutt, Northcutt, Northcutt, Northcutt, Sas, Sheldon, Stendell, Stendell, Stendell, Striedter, Striedter, Striedter, Suzuki, Szabo, van der Sprenkel, Weston, Wullimann, Wullimann, Wullimann, Wullimann   +71 more
core   +1 more source

Diet of the electric knife-fishes, Gymnotus omarorum, is described in Laguna Blanca Río Pilcomayo National Park, Formosa province [PDF]

, 2014
Se describe la dieta de la morena, Gymnotus omarorum, en Laguna Blanca Parque Nacional Río Pilcomayo, Formosa. Se realizaron 8 muestreos desde septiembre de 2012 hasta julio de 2013. Para el análisis de los contenidos estomacales se utilizaron métodos de
Ferriz, Ricardo Alberto, Iwaszkiw, Juan Miguel   +1 more
core  

First chromosomal analysis of Gymnorhamphichthys britskii: the remarkable lowest diploid value within the family Rhamphichthyidae (Gymnotiformes)

Neotropical Ichthyology
Gymnorhamphichthys britskii is a Neotropical electric fish of family Rhamphichthyidae described from the Paraná-Paraguay system. This study reports the first karyotypic description of G.
Carlos Alexandre Fernandes, Allan Kardec Moreira de Aguiar, Leonardo Marcel Paiz, Lucas Baumgärtner, Diovani Piscor, Vladimir Pavan Margarido   +5 more
doaj   +1 more source

Electrosensory Frequency and Intensity Discrimination in the Wave-Type Electric Fish Eigenmannia [PDF]

, 1991
Eigenmannia's frequency and intensity discrimination thresholds were determined for a range of seven frequencies (50-1700Hz), centered on a fish's individual discharge frequency, using a conditioned go/no-go paradigm.
Kaunzinger, Ivo, Kramer, Bernd
core  

The Ecological Memory of Fish Assemblages in Tropical Agroecosystems With Different History of Landscape Changes

Freshwater Biology, Volume 70, Issue 12, December 2025.
ABSTRACT Environmental changes can have persistent effects on the local and regional dynamics of multispecies assemblages. However, the extent of historical legacies on current diversity patterns may depend on the trajectory and intensity of the environmental change. Here, we investigate how persistent decadal land use and land cover (LULC) changes are
Jaquelini O. Zeni, Gabriel L. Brejão, Lilian Casatti, Tadeu Siqueira   +3 more
wiley   +1 more source