A portable bio-amplifier for electric fish research: design and construction

Wells, Jonathan K.; Crampton, William G. R.

doi:10.1590/s1679-62252006000200018

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…Temperature was standardized to 27.0 ± 0.2 °C for at least 5 min before recording. Signals were amplified from tank‐end silver‐silver chloride or nickel‐chromium electrodes using an AC‐coupled amplifier (DC or 0.01 Hz–50 kHz; custom built following Wells & Crampton, 2006; CWE BMA 200; or Ametek SR‐5113) and digitized at 48–200 kHz (Sony TCD D3 or D7 DAT recorder; Edirol UA‐5; or National Instruments DAQ‐6052E). All EODs were saved as ASCII files for analysis in custom written MATLAB (The MathWorks, Natick, MA) or JAVA (Sun Microsystems, Inc., Santa Clara, CA) programs.…”

Section: Methodsmentioning

confidence: 99%

Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes)

Santana

Crampton

2011

Zoological Journal of the Linnean Society

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A phylogenetic reconstruction of the Neotropical electric fish genus Hypopygus based on 47 parsimony-informative morphological characters is presented. A series of synapomorphies support the hypothesis of monophyly of Hypopygus, and partially resolve species-level relationships within the genus. Hypopygus species are recognized here as miniaturized fishes based on two criteria; first, a derived condition of diminutive body size, and; second, the presence of a suite of reductive morphological characters, including partial or total losses, simplifications, and reductions of the anal-fin rays, scales, cranial bones, and laterosensory canal system. Reductive characters associated with miniaturization comprise 45% of the total number of characters in the phylogenetic reconstruction of the genus. Miniaturization and reductive morphological evolution in Hypopygus are discussed here in the phylogenetic context. A taxonomic revision of Hypopygus is presented, in which five new species are described, two species previously assigned to the genus are redescribed, and a single known species of Stegostenopos is redescribed and included in Hypopygus as a junior synonym. Distribution maps and a key for all eight valid species of Hypopygus are provided, based on the examination of 5014 catalogued museum specimens.

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Section: Methodsmentioning

confidence: 99%

Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes)

Santana

Crampton

2011

Zoological Journal of the Linnean Society

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“…Collections were made using standard ichthyological gear, including seine nets (5, 10 and 20 m, 5 mm between knots), dip nets, cast nets, traps, and hook and line. Electric fishes were located with the aid of a portable amplifier (Wells and Crampton 2006). A local fish-toxin called huaca (pronounced 'waka') was used in log jams of larger streams.…”

Section: Methodsmentioning

confidence: 99%

Fishes from the upper Yuruá river, Amazon basin, Peru

Carvalho¹,

Tang²,

Fredieu³

et al. 2009

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We report results of an ichthyological survey of the upper Rio Yuruá in southeastern Peru. Collections were made at low water (July-August, 2008) near the headwaters of the Brazilian Rio Juruá. This is the first of four expeditions to the Fitzcarrald Arch — an upland associated with the Miocene-Pliocene rise of the Peruvian Andes — with the goal of comparing the ichthyofauna across the headwaters of the largest tributary basins in the western Amazon (Ucayali, Juruá, Purús and Madeira). We recorded a total of 117 species in 28 families and 10 orders, with all species accompanied by tissue samples preserved in 100% ethanol for subsequent DNA analysis, and high-resolution digital images of voucher specimens with live color to facilitate accurate identification. From interviews with local fishers and comparisons with other ichthyological surveys of the region we estimate the actual diversity of fishes in the upper Juruá to exceed 200 species.

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“…Individual fish were placed within a nylon-mesh sock. The electrodes were connected to a custom-built AC-coupled differential amplifier with a frequency response of +/-3 dB from 0.2 Hz-110 kHz (Wells & Crampton, 2006). EODs were digitized using an Edirol UA5 A-D converter at a sampling rate of 96 kHz and resolution of 24 bits.…”

Section: Methodsmentioning

confidence: 99%

Brachyhypopomus draco, a new sexually dimorphic species of Neotropical electric fish from southern South America (Gymnotiformes: Hypopomidae)

2008

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Brachyhypopomus draco, new species, is described from central, southern and coastal regions of Rio Grande do Sul state, Brazil, and Uruguay. It is diagnosed from congeners by, among other characters, the shape of the distal portion of the caudal filament in mature males, which during the reproductive period forms a distinct paddle shape structure.Brachyhypopomus draco, espécie nova, é descrita para as regiões central, sul e costeira do estado do Rio Grande do Sul, Brasil, e Uruguai. Ela é diagnosticada de seus congêneres, entre outros caracteres, pela porção final do filamento caudal de machos maduros, que adquire a forma de um remo durante o período reprodutivo, .

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A portable bio-amplifier for electric fish research: design and construction

Cited by 9 publications

References 2 publications

Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes)

Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes)

Fishes from the upper Yuruá river, Amazon basin, Peru

Brachyhypopomus draco, a new sexually dimorphic species of Neotropical electric fish from southern South America (Gymnotiformes: Hypopomidae)

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