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Compensatory growth in scallops Nodipecten nodosus cultured in Caraguatatuba, São Paulo State


Scallops are bivalve pectinids of great commercial value. In Brazil, Nodipecten nodosus is the largest known species, and the State of Santa Catarina is the largest producer in Brazil. The production of juveniles in laboratory is well established; nevertheless, it is necessary to study better the stocking densities and forms of culture management, in order to maximize growth and to reduce production cost. Consequently, an interesting strategy to be adopted would be the assessing of a possible compensatory growth in this species, similarly to that observed in other aquatic organisms, in view of to enable the storage of juveniles at high densities during the intermediate culture phase and the use of high densities also during part of growing phase. Thus, this work aims in a first experiment, to assess the occurrence of compensatory growth in N. nodosus stocked at high densities (800, 1600 e 3200 m-2) during the intermediate phase (4 months) and subsequently transferred to low densities (50 m-2) during the growing phase. In a second experiment, scallops will be maintained at high stocking densities (600, 400 e 200 scallops m-2), during the two initial months of growing phase, with posterior reduction to 50 scallops m-2. In the control treatment (T50), scallops will be cultured along all the growing phase at 50 m-2. Data of growth in height, total weight and adductor muscle weight will be compared by ANOVA. Water temperature, salinity, transparence, a-chlorophyll and suspended total solids will be periodically monitored. A partial budget analysis will test the economic viability of the management at the three tested densities. (AU)