Results 61 to 70 of about 292 (171)

The efficacy of clove oil as an anaesthetic and in euthanasia procedure for small-sized tropical fishes

open access: yesBrazilian Journal of Biology
Clove oil is used as a fish anesthetic because it is a natural and inexpensive product with low toxicity risks. The goal of the present study was to determine the appropriate concentration of clove oil for small-sized tropical fish to be used in mark ...
I. M. Fernandes   +4 more
doaj   +1 more source

Hemigrammus eques NT

open access: yes, 2014
Published as part of Litz, Thomas O. & The, Stefan Koerber Introduction, 2014, Check List of the Freshwater Fishes of Uruguay (CLOFF-UY)., pp.
Litz, Thomas O.   +1 more
openaire   +2 more sources

A new characid species with remarkable sexual dimorphism (Characiformes: Characidae: Stevardiinae) from the upper Guayabero River, Orinoco basin, Colombia

open access: yesJournal of Fish Biology, Volume 104, Issue 6, Page 1947-1959, June 2024.
Abstract A new species of characid with remarkable sexual characteristics is described from the upper Guayabero River drainage from the Orinoco basin in Colombia. The new species is included in the genus Monotocheirodon by sharing most of the previously proposed diagnostic features of this genus.
Tiago P. Carvalho   +3 more
wiley   +1 more source

Trophic ecology and condition factor of two sympatric species of Hemigrammus from a stream of the Negro River Basin, Brazilian Amazon

open access: yesBrazilian Journal of Biology
This study aimed to evaluate the diet and condition factor of Hemigrammus levis and Hemigrammus coeruleus in a stream in the Tupé Sustainable Development Reserve, in the lower Negro River region, and contribute information on the biology of small species
M. Garrido, C. Lubich, K. C. Yamamoto
doaj   +1 more source

A new Hyphessobrycon (Characiformes: Acestrorhamphidae) from the Central Amazon basin, Brazil [PDF]

open access: yesPapéis Avulsos de Zoologia
A new species of Hyphessobrycon is described from the region of the lower rioTapajós basin, state ofPará, and tributaries of the northern bank of the Amazon River from the rio Itapiranga basin westward to the lower rio Negro basin, states of Amazonas and
Flávio C.T. Lima   +3 more
doaj   +1 more source

Sensing in the dark: Constructive evolution of the lateral line system in blind populations of Astyanax mexicanus

open access: yesEcology and Evolution, Volume 14, Issue 4, April 2024.
Previous studies predominantly investigated eye regression in cavefish evolution, but less is known about constructive evolution of non‐visual sensory systems in subterranean species. This review highlights our state of knowledge on mechanosensory lateral line expansions in Astyanax mexicanus, emphasizing anatomical features, synaptic plasticity, and ...
Roberto Rodríguez‐Morales
wiley   +1 more source

Length–weight relations of fishes (Actinopterygii) from karst streams in the Bodoquena Plateau, western Brazil [PDF]

open access: yesActa Ichthyologica et Piscatoria, 2018
The presently reported study provides the length–weight relations (LWR) for 23 species from headwater streams of the Bodoquena Plateau, which is located on the southern border of the Brazilian Pantanal.
F. Severo-Neto   +4 more
doaj   +3 more sources

Meta‐analysis contrasting freshwater biodiversity in forests and oil palm plantations with and without riparian buffers

open access: yesConservation Biology, Volume 38, Issue 1, February 2024.
Abstract The expansion of oil palm plantations has led to land‐use change and deforestation in the tropics, which has affected biodiversity. Although the impacts of the crop on terrestrial biodiversity have been extensively reviewed, its effects on freshwater biodiversity remain relatively unexplored.
Oscar Alberto Rojas‐Castillo   +10 more
wiley   +1 more source

Capturas ícticas incidentales de la pesca ornamental en el período de aguas bajas en el área de influencia de Puerto Carreño, Orinoquia colombiana

open access: yesUniversitas Scientiarum, 2009
Incidental bycatch by ornamental fishing during the low-water season in the influence zone of Puerto Carreño, ColombianOrinoco Basin. Objective. The present study assesses the incidental fish catches in the fishing of ornamental species in terms ...
Juan Mondragón-Estupiñan   +2 more
doaj  

EVOLUCIÓN DE LA INTEGRIDAD ESTRUCTURAL DE ECOSISTEMAS LÓTICOS DEL PIEDEMONTE LLANERO FRENTE A LA INTERVENCIÓN ANTRÓPICA

open access: yesActa Biológica Colombiana, 2015
Entre los años 1993 y 2007 se determinó la evolución de la integridad ecológica de dos corrientes del piedemonte llanero del Meta, los caños Mateguadua y Caibe en proximidades a los municipios de Restrepo y Cumaral.
Guillermo Aramando Briceño Vanegas
doaj   +1 more source

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