Crecimiento somático y relación ARN/ADN en estadios juveniles de <i>Eucinostomus argenteus</i> (Pisces: Gerreidae) en dos localidades del Caribe de Venezuela

Abstract

Somatic growth and RNA/DNA rate of Eucinostomus argenteus (Pisces: Gerreidae) juveniles stages at two localities of the Venezuelan Caribbean. In order to evaluate the association among growth indices of marine fishes at early life stages, the somatic growth rate and physiological conditions of Eucinostomus argenteus were estimated at two Venezuelan North-East zones: Mochima Bay and Cariaco Gulf. The age and somatic growth rate were estimated based on daily growth increments in sagitta otoliths. The physiological conditions were evaluated with proteins concentrations and RNA/DNA rate, which were estimated by spectrofluorometric and fluorometric techniques, respectively, on muscle tissue. Juvenile standard length ranged from 9.80 to 39.20mm from 21 to 73 days of age. At all the study localities there were significant and positive correlations between age, otolith diameter and body size, and fitted to a linear regression model. The values of recent growth rate ranged from 0.178 to 0.418mm day -1 , backcalculated growth rate oscillated between 0.295 -0.393mm day -1 , and RNA/DNA rate ranged from 1.65 to 6.97. Differences were not found between study zones, but there were differences between localities. Despite the fact that there was no correlation between juvenile´s somatic growth and RNA/DNA rates, the reported values suggesting a E. argenteus juvenile's positive growth in their natural habitat at localities studied. Nevertheless, in some localities values that indicate poor nutritional conditions were registered, which could affect other future demographic rates as survivor and fecundity. Rev. Biol. Trop. 60 (Suppl. 1): 151-163. Epub 2012 March 01.

Age and growth of larval Pacific flagfin mojarra (Eucinostomus currani) in coastal Ecuador based on otolith analysis

“…Las tasas de crecimiento de las larvas registradas en este estudio (0.7 y 0.22 mm por día) fueron similares a las del único otro estudio de larvas de Gerridae. En ese estudio, Herrera-Reveles et al (2012) reportaron tasas de crecimiento de 0.18 a 0.42 mm por día en juveniles (21-73 días) de Eucinostomus argenteus en la costa de Venezuela. Sin embargo, estas tasas son relativamente rápidas en comparación con otros eupercáridos de la zona de rompiente (Cynoscion nebulosus: 0.40-0.42 mm por día [Peebles y Tolley 1988]; Cynoscion spp.…”

Morphometric analysis on sagitta, asteriscus and lapillus of Shortnose Mojarra Diapterus brevirostris (Teleostei: Gerreidae) in Cuyutlan coastal Lagoon, Colima, Mexico

“…Age determination of G. cinereus was calculated by Álvarez-Hernández (1999) and Jones et al (2010), using length frequency analysis and scales. Herrera-Reveles et al (2012) studied daily growth increments and RNA/DNA ratios in juveniles of Eucinostomus argenteus in the Caribbean sea of Venezuela. Chen et al (2007) analyzed mitocondrial DNA in relationships on phylogenetic studies.…”