Recuperation of Nodipecten nodosus scallop spats (Linnaeus, 1758) after different periods of permanence in laboratory and in the sea

Abstract

The spats recuperation rate of Nodipecten nodosus scallop was analyzed in three different settlement times, in the laboratory and with respect to permanence in the sea. Two experiments were carried out in the Santa Catarina region, South of Brazil: the first, from August to October of 2000 and the second, from March to May of 2001. The eyed larvae, obtained from the LMM-UFSC, were placed to be settled in collectors and remained in the laboratory for 15, 25 and 35 days. When transferred to the sea, the collectors remained in the sea 10, 20 and 30 days. Regarding the recuperation in the laboratory, the highest value was obtained after 15 days of settlement in both experiments 1 and 2 (1.34% and 1.30% respectively). For recuperation of the spats in the sea, there was no significant difference between the different times of permanence. However, when analyzing and comparing results of both the recuperation in the laboratory and that carried out in the sea, it was observed that there is a significant decrease in the recuperation of the animals in the different permanence times in the sea for spats with 15 days in the laboratory. For spats with 20 and 30 days of permanence in the sea, there was no significant difference in the recuperation rate when they remained 15, 20 and 35 days in the laboratory. This study shows that for the recuperation of spats the best results were of those which remained in the laboratory for 15 to 25 days and in the sea for 20 days.