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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

AVENDANO, RUBÉN E.; RIQUELME, CARLOS E.; ESCRIBANO, RUBÉN  and  REYES, NELSON. Postlarval survival and growth of Argopecten purpuratus (Lamarck,1819) in Bahia Inglesa, Chile: effects of origin, distribution in the bay and larval bacterioflora. Rev. chil. hist. nat. [online]. 2001, vol.74, n.3, pp.669-679. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2001000300012.

Argopecten purpuratus is one of the most commercially important marine resources in Chile. One of the most critical steps in the massive culture of this species is the transference of postlarvae from hatchery production to the sea where significant mortality regularly occurs. The factors behind this low survival rate are probably diverse, and are as yet unknown. In the present study, postlarval survival and growth was observed as a function of origin of postlarvae, distribution of postlarvae in the bay, and microbial loading of the postlarvae. Survival rates were measured for different sites in Bahia Inglesa, Chile (27° 03' 24" S, 70° 51' 30" W) as well as changes in the bacterioflora of the postlarvae. Postlarvae utilized in the study were obtained from Cultivos Marinos Internacionales (III Región) and Cultivos Guayacan (IV Región). Results of the study clearly indicated that survival in culture of the postlarvae was related to their location in the bay and the origin of the postlarvae. However, the growth of the post-larvae is not affected (P < 0.05). Microbiologically, it was observed that Vibrio spp. were the bacterial component most represented among strains isolated from the postlarvae (53.36 %) from both populations studied. Principal component analysis revealed no differences between cultivable vibrios from both cultures. However, microflora from the Guayacan group were less susceptible to increases in bacteria originating in their surrounding environment

Keywords : Argopecten purpuratus; postlarval survival and growth; Vibrio spp.

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