Results 71 to 80 of about 3,600 (245)

Species diversity and geographic distribution of Gymnotus (Pisces: Gymnotiformes) by nuclear (GGAC)n microsatellite analysis

open access: yesGenetics and Molecular Biology, 2000
Patterns of amplified DNA fragments flanked by (GGAC)n microsatellites, obtained by single primer amplification reaction (SPAR), from 198 Gymnotus specimens (Pisces: Gymnotiformes) sampled from 8 southeastern Brazilian river basins were analyzed.
F.M.C. Fernandes-Matioli   +2 more
doaj   +1 more source

Aspectos biológicos e reprodutivos para a criação da Tuvira (Gymnotus sp.) em cativeiro - I. [PDF]

open access: yes, 2019
A tuvira (Gymnotus sp.), também conhecida como peixe espada, sarapó, carapó e ituí, é muito utilizada como isca viva na pesca esportiva, sendo a mais preferida pelas espécies de peixes consideradas nobres e muito esportivas, como os piscívoros de grande ...
ROTTA, M. A.
core  

The complete mitochondrial genome of the Chinese hook snout carp Opsariichthys bidens (Actinopterygii : Cyprinifonnes) and an altemative pattem of mitogenomic evolution in vertebrate [PDF]

open access: yes, 2007
The complete mitochondrial genome sequence of the Chinese hook snout carp, Opsariichthys bidens, was newly determined using the long and accurate polymerase chain reaction method.
He, Shunping   +4 more
core   +1 more source

Electric eels galore: microsatellite markers for population studies [PDF]

open access: yesNeotropical Ichthyology
Fourteen novel microsatellite loci are described and characterized in two species of electric eels, Electrophorus variiand E. voltaifrom floodplains and rivers of the Amazon rainforest.
Lenice Souza-Shibatta   +9 more
doaj   +2 more sources

Parasites Are Paramount: Vertical Trophic Positions of Parasitic Catfishes in a Tropical River Food Web

open access: yesEcology of Freshwater Fish, Volume 34, Issue 4, October 2025.
ABSTRACT The Neotropical catfish family Trichomycteridae contains parasitic fishes that include scale and mucus feeders (subfamily Stegophilinae) and blood feeders (i.e., ‘candirus’, subfamily Vandelliinae). The influence of parasitic catfishes on food web dynamics is unknown.
Carmen G. Montaña   +7 more
wiley   +1 more source

Predation and Crypsis in the Evolution of Electric Signaling in Weakly Electric Fishes

open access: yesFrontiers in Ecology and Evolution, 2019
Eavesdropping by electroreceptive predators poses a conflict for weakly electric fish, which depend on their Electric Organ Discharge (EOD) signals both for navigation and communication in the dark.
Philip K. Stoddard   +3 more
doaj   +1 more source

Fish, Corumbataí and Jacaré-Pepira river basins, São Paulo State, Brazil [PDF]

open access: yes, 2006
Fish were studied in two river basins (Corumbataí and Jacaré-Pepira) subjected to strong human pressure, in the interior of the State of São Paulo, southeastern Brazil.
Braga, F. M. S., Gomiero, L. M.
core  

Gill evolution in Neotropical electric fishes: Comparative phylogenetic evidence for hypoxia‐driven adaptation

open access: yesFunctional Ecology, Volume 39, Issue 8, Page 1940-1956, August 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Tropical freshwater fishes are often exposed to hypoxia, which limits aerobic metabolism and drives the evolution of diverse physiological, behavioural and morphological adaptations.
William G. R. Crampton   +4 more
wiley   +1 more source

On the homologies of the skeletal components of catfish (Teleostei: Siluriformes) suspensorium [PDF]

open access: yes, 2001
There has been much controversy concerning the identity of the components of the suspensorium in Siluriformes (catfishes). This confusion has implications not only for comparative morphology, but also for phylogenetic studies.
Chardon, M., Diogo, R., Oliveira, C.
core  

Fish, Marmelos Conservation Area (BX044), Madeira River basin, states of Amazonas and Rondônia, Brazil. [PDF]

open access: yes, 2007
The present study provides a species list of fish from the Marmelos River Area – BX044 in the states ofAmazonas and Rondônia in northern Brazil. During a Rapid Ecological Assessment (REA) performed in October andNovember of 2003, 133 fish species from ...
Camargo, M., Giarrizzo, T.
core   +1 more source

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