Habitos troficos de la reineta Brama australis (Pisces: Bramidae) durante el periodo estival frente a Chile central

Abstract

RESUMEN.La reineta Brama australis es un importante recurso pesquero artesanal en la zona central chilena, incorporado en los programas de seguimiento biológico, pero con escasas evaluaciones de sus aspectos tróficos. Para actualizar el estado del conocimiento, se analizó su dieta durante el verano austral época de mayor disponibilidad de este recurso en la zona central de Chile, mediante el análisis del contenido gástrico de 300 ejemplares capturados entre noviembre 2011 y marzo 2012. Se identificó una dieta dominada por Euphausia mucronata (IIR = 92,33), aunque a escala mensual se identificó una dieta mixta de E. mucronata durante noviembre, diciembre 2011 y marzo 2012, además de Pterygosquilla armata y anfípodos hipéridos durante enero y marzo 2012. No se encontró diferencias significativas entre ambos sexos (P > 0,01). Estos resultados demuestran y corroboran que B. australis es un depredador pelágico con un reducido espectro trófico en el litoral de Chile central. Southern ray´s bream (Brama australis) summer feeding habits off central ChileABSTRACT. The southern ray´s bream Brama australis is an important artisanal fishery resource in the coast of central Chile, included into biological monitoring programs, but with few evaluations of its trophic aspects. In order to update the state of knowledge, its diet was analyzed during the austral summer (time of greater availability of this fish in the central coast of Chile). By means of stomach contents analysis of 300 specimens captured between November 2011 and March 2012. A diet dominated by Euphausia mucronata (IIR = 92.33%) was identified, although on a monthly scale a mixed diet of E. mucronata was identified during November, December 2011 and March 2012, beside Pterygosquilla armata and hyperiid amphipods during January and March 2012. A comparison by gender revealed no significant differences. These results demonstrate and confirm that B. australis is a selective pelagic predator of reduced trophic spectrum in the coast of central Chile.

A pilot tagging program on southern rays bream (Brama australis): methodology and preliminary recaptures

“…Its growth is relatively slow, with no sexual dimorphism and a lifespan between 9 and 12 years (Leal 2019). B. australis also has a narrow trophic spectrum, eating mostly krill (Euphausia mucronata), and occasionally cephalopods, small fishes (Muñoz et al 1995, García & Chong 2002, stomatopods (Pterygosquilla armata) and hyperiid amphipods (Santa Cruz et al 2014). Based on histological analyses, the reproductive biology of this species was characterized as asynchronous with indeterminate fecundity and winter batch spawning with a long maturity period (Leal & Oyarzún 2003).…”

Metazoan parasites ofBrama australisfrom southern Chile: a tool for stock discrimination?

“…The southern ray's bream Brama australis Valenciennes 1838 is distributed along the Pacific coast of South America, from Coquimbo (29° 57′ S) to the Strait of Magellan (53° 09′ S) (Santa Cruz et al , ). Historically, B .…”