Results 181 to 190 of about 2,449 (227)

Spinal Abnormalities in a Specimen of the Panamanian Knifefish Apteronotus rostratus (Apteronotidae: Gymnotiformes) with Comments on Gymnotiform Locomotion

Copeia, 2018
Skeletal deformities among fishes are well documented in the aquaculture industry and husbandry studies. However, these deformities are noticeably less prevalent among wild caught animals, likely due to their deleterious effects on the fitness of affected individuals particularly at earlier life-history stages. Here we use micro-CT imaging to describe,
Kory M. Evans, Andrew M. Savage, James S. Albert   +2 more
openaire   +1 more source

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
openaire   +2 more sources

Systematics of Neotropical electric knifefish Tembeassu (Gymnotiformes, Apteronotidae)

Systematics and Biodiversity, 2022
A new species of the poorly known and critically endangered ghost knifefish Tembeassu is described from the upper Paraná and Araguari rivers, Brazil, using external anatomy and X-ray microcomputed tomography (µCT scan). Tembeassu titanicus sp. nov.
L. Peixoto, R. Campos-da-Paz, N. Menezes, C. D. de Santana, M. Triques, Aléssio Datovo   +5 more
semanticscholar   +1 more source

Molecular systematics and biogeography of a new rheophilic species of ghost electric fish (Gymnotiformes: Apteronotidae: Porotergus) from the eastern Guianas

Systematics and Biodiversity
A new rheophilic species of Porotergus Ellis, 1913 is described from the rapids of the Coppename and Suriname rivers in Suriname, as well as the Mana and Maroni rivers in French Guiana, based on molecular and morphological evidence.
C. D. de Santana, P. Le Bail, L. Peixoto, Wan-Tong K. You, M. Gianeti, C. H. Eon, M. Loeb, J. Mol, R. Covain   +8 more
semanticscholar   +1 more source

A New Species of Sternopygus (Gymnotiformes: Sternopygidae) from the Atlantic Coast of the Guiana Shield

Ichthyology & Herpetology, 2022
Sternopygus sabaji, new species, is described from the Atlantic drainages of the Guiana Shield region of South America using traditional methods of morphometrics and meristics and microcomputed tomography (µCT) scans for osteological analysis.
Kevin T. Torgersen, J. Albert
semanticscholar   +1 more source

Modular Design of Gymnotiform Undulating Fin

2019
In the field of underwater robot, gymnotiform undulating fin inspired a number of research group over the world. A variety of design has been consequently created and developed with the design of multi-actuators. However, this type of design has the remarkable downsides.
Van Dong Nguyen, Canh An Tien Pham, Van Hien Nguyen, Thien Phuc Tran, Tan Tien Nguyen   +4 more
openaire   +1 more source

A Dorsally Expressed Anal Fin in the Black Ghost Knifefish Apteronotus albifrons (Gymnotiformes: Apteronotidae)

Ichthyology & Herpetology
The Gymnotiformes, or electric knifefishes, is a clade of freshwater ostariophysan fishes native to tropical South and Central America that are easily recognized by the presence of an elongate body and elongate undulating anal fin, and lack of dorsal and
Kevin T. Torgersen, Daniel R. Akin, Jessé M. Figueiredo-Filho, O. H. Hawkins, James S. Albert   +4 more
semanticscholar   +1 more source

Reproductive strategies and developmental aspects in mormyrid and gymnotiform fishes

Journal of Physiology-Paris, 2002
Comparative data on the reproduction in captivity and ontogenetic development of six of mormyrid species and seven gymnotiform species are reported. Mormyrid fishes: egg diameter ranged from 1.8 (Petroephalus soudanensis) to 3.0 mm (Hippopotamyrus pictus.
Frank, Kirschbaum, Christian, Schugardt
openaire   +2 more sources

Electric organ discharges of the gymnotiform fishes: III. Brachyhypopomus

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1999
We measured and mapped the electric fields produced by three species of neotropical electric fish of the genus Brachyhypopomus (Gymnotiformes, Rham phichthyoidea, Hypopomidae), formerly Hypopomus. These species produce biphasic pulsed discharges from myogenic electric organs. Spatio-temporal false-color maps of the electric organ discharges measured on
P K, Stoddard, B, Rasnow, C, Assad
openaire   +2 more sources

Individual Repeatability of Locomotor Kinematics and Swimming Performance in a Gymnotiform Swimmer

Physiological and Biochemical Zoology, 2021
AbstractGymnotiform swimming is a specialized form of swimming wherein thrust is produced by the ribbonlike motion of an elongate anal fin, while the body is held relatively stiff. This form of swimming has been extensively examined in relation to the biomechanics of thrust production, the kinematics of the anal fin, and neuromuscular control, whereas ...
C E, Oufiero, K, Kraskura, R, Bennington, J A, Nelson   +3 more
openaire   +2 more sources