Results 111 to 120 of about 709 (151)

Postembryonic development of the cerebellum in gymnotiform fish

The Journal of Comparative Neurology, 1996
In contrast to adult mammals, adult teleost fish regularly generate new neurons and glial cells in many brain regions. A previous quantitative mapping of the proliferation zones in the brain of adult Apteronotus leptorhynchus (Teleostei, Gymnotiformes) has shown that 75% of all mitotically active cells are situated in the cerebellum (Zupanc and ...
Zupanc, G. ; https://orcid.org/0000-0001-8715-9994, Horschke, I., Ott, R., Rascher, G.   +3 more
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A Study on Force Generated by Gymnotiform Undulating Fin

2018 15th International Conference on Ubiquitous Robots (UR), 2018
Underwater vehicles inspired by the motion of fish can generate a highly efficient force. This paper considers the gymnotiform undulating fin which imitates the motion of South American black ghost knifefish. The equations of the force generated by both continuous and discontinuous sine wave are established.
Van Hien Nguyen, Canh An Tien Pham, Van Dong Nguyen, Dae Hwan Kim, Tan Tien Nguyen   +4 more
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Molecular phylogeny of the ghost knifefishes (Gymnotiformes: Apteronotidae)

Molecular Phylogenetics and Evolution, 2019
Ghost knifefishes (Gymnotiformes: Apteronotidae) are weakly electric fishes that possess a high-frequency, neurogenic electric organ discharge. They are found throughout the humid Neotropics from Panama to Argentina and are most diverse and abundant in the channels of large lowland rivers.
Maxwell J, Bernt, Victor A, Tagliacollo, James S, Albert   +2 more
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Ontogeny and evolution of electric organs in gymnotiform fish

Journal of Physiology-Paris, 2008
In order to further our understanding of the evolution of electric organs in the Neotropical gymnotiform fish, we studied the ontogeny of the electric organs in eight species. In Eigenmannia virescens, Sternopygus macrurus, and Apteronotus leptorhynchus the earliest electrocytes are located between muscle fibres of the hypaxial muscle (Type A ...
F, Kirschbaum, H O, Schwassmann
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Hydrodynamic optimality of balistiform and gymnotiform locomotion

European Journal of Computational Mechanics, 2017
Some groups of fish have evolved to generate propulsion using undulatory elongated fins while maintaining a relatively rigid body.
Brennan Sprinkle, Rahul Bale, Amneet Pal Singh Bhalla, Malcolm A. MacIver, Neelesh A. Patankar   +4 more
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Time-Comparator Neural Circuits of Gymnotiform Electric Fishes

Zoological Science, 2023
Weakly electric fish possess electrosensory neural systems that are dedicated to detect microsecond time differences between sensory signals. Many features of this timing system, such as electroreceptor encoding, time-locked responses, and time-comparator neural circuit, are shared by closely related as well as distantly related electric fishes.
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Gymnotiformes Berg 1940

2017
GYMNOTIFORMES Review: Eigenmann, Fisher (1914), Peru; Eigenmann, Allen (1942), Trans-Andes; Mago-Leccia (1994), Venezuela and vicinity. Overview: Albert, Crampton (2005). Revision: Eigenmann, Ward (1905); Ellis (1913); Albert (2001). Checklist: Eigenmann, Eigenmann (1891); Eigenmann (1910); Reis et al. (2003); Maldonado-Ocampo, Albert (2003), Colombia;
Carl J. Ferraris, Jr., Santana, Carlos David de, Vari, Richard P.   +2 more
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Biogeography and Breeding in Gymnotiformes from Uruguay

Environmental Biology of Fishes, 2003
This study was carried out in Uruguay (30–35°S), South America, with two complementary approaches. First, an extensive exploration of Uruguayan freshwaters allowed us to assess the distribution of the two major species of Gymnotiformes (out of 4) across sites.
Ana Silva, Laura Quintana, Matías Galeano, Pablo Errandonea   +3 more
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Cytogenetic and Molecular Characterization of Eigenmannia aff. desantanai (Gymnotiformes: Sternopygidae): A First Report of System of Sex Chromosomes ZW 1 W 2 /ZZ in Gymnotiformes

Zebrafish, 2023
Gymnotiformes a monophyletic group of fish endemic to the Neotropics, represent an important component of the freshwater ichthyofauna that presents relevant taxonomic problems. Thus, in view of the morphological complexity involving Eigenmannia (Gymnotiformes) fish species, this study aimed to characterize Eigenmannia aff.
Laura Ivana Ramos, Alessandra Valeria De Oliveira, Ana Luiza De Brito Portela-Castro   +2 more
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The electric organ discharges of the gymnotiform fishes: II. Eigenmannia

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1998
We present detailed measurements of the electric organ discharge of the weakly electric fish, Eigenmannia sp. These maps illuminate, with high resolution in both space and time, the electric organ discharge potential and electric field patterns in the water about the fish and on the skin surface itself.
C, Assad, B, Rasnow, P K, Stoddard, J M, Bower   +3 more
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