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ATTACHMENT OF LARVA, SURVIVAL AND GROWTH OF JUVENILE SCALLOPS (Pecten jacobaeus Linnaeus, 1758) IN CONTROLLED BREEDING IN ŠARINA DRAGA BAY —MOUTH OF THE KRKA RIVER
2005, 63 (1) p. 1-14
Drago Marguš, Emin Teskeredžić
Abstract
The capture of scallops (Pecten jacobaeus Linnaeus, 1758) from natural populations in Croatia is sporadic and unorganizaed, as a secondary activity in fishing, while no controlled cultivation of this species exists. Research of the gonad index of adults, larvae attachment, survival and growth of juvenile scallops was conducted with the aim of determining the possibility of the establishment controlled cultivation and in this way the introductes new species in Croatia’s aquaculture production. The capability to replace the population varies in time and space, and is dependent upon the hydrographical characteristics of the river mouth. The most favourable period for collecting juveniles is March–June between 6 to 8 meters depth above the sea bottom. The vertical attachment of juveniles is inversely related to salinity. The lowest salinity for attachment and juveniles survived was about 20 x 10–3, while successful collection is possible at salinities above 30 x 10–3. Shellfish aged 6 months, mean size of 33.1±5.5 mm and with a mean mass of 8.8 g reached mean sizes of 83.8±9.5 mm and mean mass of 80.6 g at one year. Total mortality during this study was 33%.
Keywords
scallop, pecten jacobaeus, controlled cultivation, mouth of krka river