Ernesto Ron

• Biological Sciences Ph.D. & Marine Sciences M.Sc.
• Academic Cordinator at Vitapro S.A.

The original description of Mugil gaimardianus has created various taxonomic problems in the past since the description is ambiguous and the type specimen is apparently lost. The name M. gaimardianus could not be reliably applied to any known species and was suppressed by the International Commission on Zoological Nomenclature (ICZN) (Bulletin of Z...

Cytogenetic studies were conducted on Mugil trichodon from Margarita Island, Venezuela. The species showed a karyotype 2n=48 with entirely acrocentric chromosomes (Arm number, NF=48). Chromosomes gradually decreased in size and did not allow a clear distinction of homologues, except for one marker pair, which showed a conspicuous secondary constric...

Sharks are suffering from intensive exploitation by worldwide fisheries leading to a severe decline in several popula- tions in the last decades. The lack of biological data on a species-specific basis, associated with a k-strategist life his- tory make it difficult to correctly manage and conserve these animals. The aim of the present study was to...

The karyotype and chromosomal characteristics of the characid fish Triportheus venezuelensis were investigated using differential staining techniques (C-banding, Ag-NOR staining) and fluorescent in situ hybridization (FISH) with an 18S rDNA probe. The diploid chromosome number (2n = 52), karyotype composition and sex chromosome determination system...

Conventional karyotype and nucleolar organizer regions (NORs) of C. macropomum x P. brachypomus hybrids and parental species are reported. A modal diploid number of 54 chromosomes and a fundamental number (NF) of 108 were found for C. macropomum, P. brachypomus and their hybrids. P. brachypomus shows a pair of silver stained chromosomes, while cell...

Some structural and population aspects of the fish community of Laguna de Los Mártires, a small positive estuary (1.9-25 PSU), located on Isla de Margarita, in the Southeast Caribbean Sea, were studied. During a year of monthly sampling at five stations, only 10 fish species were recorded. Of these, Oreochromis mossambicus (Peters 1852), was the on...

RESUMEN: Se presenta el análisis morfométrico multivariado para cuatro de las siete especies del género Mugil reportadas para Venezuela (Mugil trichodon, M. liza, M. margaritae y M. rubrioculus), separadas con base en sus características citogenéticas (número diploide, formula cariotípica y la posición de las regiones organizadoras del nucléolo), p...

Se describe la infraestructura de una pequeña granja dedicada a la cría de trucha arcoiris, Oncorhynchus mykiss, en Los Andes de Venezuela

La camaronicultura ha venido creciendo significativamente en las últimas décadas, particularmente en el sudeste asiático, India y Ecuador. Paralelamente, la bioseguridad se ha presentado como una necesidad del aparato productivo debido a la frecuencia, magnitud y naturaleza de las enfermedades que afectan a los camarones penaeidos. En este artículo...

Sobre los tiburones inciden serias amenazas por la sobrepesca y cambios ambientales. Son elementos de relevancia ecológica, actuando con frecuencia como modeladores de las tramas tróficas y como bio-indicadores de la salud del ecosistema. A su vez, las tramas tróficas están influenciadas por la presencia de parásitos, y al igual que otros grupos de...

First evidence of an Osprey Pandion haliaetus preying on elasmobranches in Venezuela

RESUMEN Dada la importancia ecológica y susceptibilidad de los elasmobranquios a frecuentes capturas incidentales, el seguimiento de sus pesquerías tiene gran relevancia. Considerando la ausencia de información acerca de la diversidad de elasmobranquios asociada con la pesquería de peces de pico en el puerto pesquero de Robledal, en la isla de Marg...

The genus Pterois includes nine valid species, native to the Red Sea and Indian Ocean throughout the Western Pacific. P. volitans and P. miles are native to the Indo-Pacific, and were introduced into Florida waters as a result of aquarium releases, and have been recently recognized as invaders of the Western Atlantic and Caribbean Sea (Costa Rica t...

Common octopus (Octopus vulgaris Cuvier, 1797) is a very valuable fishery resource, and also plays a significant role in trophic dynamics in ecosystems where is present, so it is important to undertake parasitological studies on it, particularly scarce. Fifty two adult specimens of common octopus, from fishing activities at Margarita Island Northea...

We analyzed the artisanal fishery of the spotted eagle ray, Aetobatus narinari, from Los Frailes Archipelago, northeastern region of Venezuela. The fishing boats used in this fishery are constructed of wood, with 6-8 m in length, two outboard motors between 40 and 75 hp. The fishing method was gillnets (43.2 cm of stretch mesh). A. narinari represe...

A cytogenetic analysis by conventional Giemsa staining, silver staining, C-banding, and fluorescence in situ hybridization (FISH) was carried out on Brycon amazonicus from Caicara del Orinoco, Venezuela. The karyotype of this species is characterized by the presence of 2n = 50 chromosomes, a karyotypic formula 22m+14sm+14st, and a fundamental numbe...

Ctenobrycon oliverai, new species, is described from the río Orinoco drainage and its main tributary, río Apure, Venezuela. This species is readily distinguished from its congeners by the high number of series of scales above lateral line and by morphometric differences in body depth, head length, and interorbital distance. Statistical multivariate...

Among the stingrays, Dasyatis guttata is one of the species most frequently caught in several coastal and insular regions of Venezuela. In spite of its importance as a fishing resource, this species has been poorly studied and the status of their populations in the Caribbean Sea is unknown. In the present study, the catch composition by size and by...

The group of rays (Pisces: Elasmobranchii) is a traditional fishing resource, basically exploited in an artisanal manner throughout diverse regions of Venezuela. However, the abundance and biomass levels are unknown for the species most frequently caught in the fisheries. In the present study, we described the artisanal ray fishery from the Cubagua...

Los tiburones y las rayas, son un grupo de peces constituido por cerca de 1100 especies, las cuales evocan en la mayoría de nosotros emociones como el miedo. Sin embargo, este increíble grupo de peces, pertenecientes a la subclase Elasmobranchii, comprenden desde pequeños tiburones que parecen caminar entre las rocas, hasta el gran tiburón ballena...

The first record of the species Squalus acanthias in waters of the Venezuelan Caribbean Sea on the basis of one female specimen (28,2 cm TL) is reported. The specimen was captured by the artisanal fishing fleet that operates with traps in the region of the Paraguaná Peninsula, Venezuela. The total length observed and the presence of a yolk sac scar...

This paper describes the karyotype of Odontesthes regia by means of Giemsa staining, C-banding, to reveal the distribution of the constitutive heterochromatin, and by Ag-staining and fluorescent in situ hybridization (FISH), to locate ribosomal genes (rDNA). The chromosome diploid modal count in the species was 2n = 48. The karyotype is composed of...

Cytogenetic studies were conducted on Mugil trichodon from Margarita Island, Venezuela. The species showed a karyotype 2n=48 with entirely acrocentric chromosomes (Arm number, NF=48). Chromosomes gradually decreased in size and did not allow a clear distinction of homologues, except for one marker pair, which showed a conspicuous secondary constric...

Se realizó la caracterización citogenética de Haemulon flavolineatum mediante las técnicas de tinción convencional con Giemsa, tinción argéntica y bandas C. El cariotipo de esta especie estuvo caracterizado por 48 cromosomas acrocéntricos y un Número Fundamental (NF) de 48. La especie posee un solo par de cromosomas portador de RegionesOrganizadora...

A cytogenetic analysis by conventional Giemsa staining, C-banding, G-banding, Silver staining, and Fluorescence in situ Hybridization (FISH) was carried out on Thalassophryne maculosa from Margarita Island, Venezuela. T. maculosa exhibits a diploid complement 2n=46, consisting of 12 metacentrics, 6 submetacentrics, 20 subtelocentrics and 8 acrocent...

Cytogenetic studies were conducted on Serrasalmus rhombeus from Caicara del Orinoco, Venezuela. The diploid chromosome number 2n=60 was composed of 30 metacentric, 16 submetacentric, 4 subtelocentric and 10 acrocentric chromosomes (NF= 110). Four pairs of NOR-bearing chromosomes were detected. NOR are located terminally on the short arms of one pai...