Croatian Journal of Fisheries (Jul 2005)
ATTACHMENT OF LARVA, SURVIVAL AND GROWTH OF JUVENILE VARIANT SCALLOPS (Chlamys varia Linnaeus, 1758) IN CONTROLLED BREEDING IN ŠARINA DRAGA BAY — MOUTH OF THE KRKA RIVER
Abstract
In Croatia, the capture of scallop (Chlamys varia Linnaeus, 17583) from natural populations are sporadic and unorganized, while there is no controlled cultivation of this species. To determine the possibility of the establishment of their commercial cultivation, the research comprehended the condition index of adults, larval attachment, juvenile survival and growth in Šarina draga Bay, in a locality with dense scallop populations. The changes of condition index shoved on main spawning season in spring (March–May) and second one, but less intensive, in autumn (October). According to results, the best season for juvenile collection is recommended the period from July to September at depths between 2 to 10 m, and salinities above 30 x 10–3. Low larval settlement at 2.5 m depth is surely result of salinity decrease by Krka river intensive fresh water inflow. Shellfish mean size from 16.4±2.1 to 17.6±2.2 mm and with a mean mass from 0.95 to 1.35 g reached mean size from 42.7±3.2 to 47.5±3.0 mm and mean mass from 12.1 to 17.5 g in one year. Total mortality during this study was ranged from 25 to 57%.
