Scientia Marina, Vol 71, No 1 (2007)

Artificial collection and early growth of spat of the scallop Argopecten purpuratus (Lamarck, 1819), in La Rinconada Marine Reserve, Antofagasta, Chile


https://doi.org/10.3989/scimar.2007.71n1197

Miguel Avendaño D.
Laboratorio de Cultivo y Manejo de Moluscos, Facultad de Recursos del Mar, Universidad de Antofagasta, Antofagasta, Chile

Marcela Cantillánez S.
Laboratorio de Cultivo y Manejo de Moluscos, Facultad de Recursos del Mar, Universidad de Antofagasta, Antofagasta, Chile

Gérard Thouzeau
Institut Universitaire Européen de la Mer, UMR,Plouzané, France

Juan B. Peña
Instituto de Acuicultura de Torre la Sal (CSIC), Castellón, Spain

Abstract


Artificial collection of early juveniles (“spat”) of the scallop Argopecten purpuratus in Japanese-type collectors was evaluated between January 2001 and July 2002 in the La Rinconada Marine Reserve, Antofagasta, Chile. This area of Antofagasta Bay has in the past been noted for the retention of scallop larvae by local gyres, in which their numbers can vary between 89 and 34175 larvae m-3, producing larval sets of 400 to 15340 post-larvae (spat) per collector. The results showed no quantitative relationship between larval abundance in the water and the spat density collected per day in the collectors, although high settlement rates were associated with high numbers of umboned larvae in the water. Allowing collectors to remain in situ for extended periods of 88 and 159 days resulted in a severe loss of seed which had settled in the collectors during the first 28 to 40 days of immersion. These losses varied between 50.9 and 99.6% of the spat collected, and were more prejudicial for the smaller cohorts that had settled in the collectors at the end of the first immersion period. The growth rates measured among different cohorts for each immersion period varied between 81.3 and 235.2 mm/day for the first cohort (C1) and between 64.0 and 167.4 mm/day for the second cohort (C2). The highest growth rates occurred in collectors containing the lowest numbers of spat after the occurrence of spat losses during the long periods of immersion. Occurrence of intraspecific competition within the collectors is discussed as potentially responsible for the decreases in spat numbers and the variations observed in their growth rates.


Keywords


Argopecten purpuratus; larvae; spat collection; growth; survival; Chile

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