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Seasonal changes in morphometric and physiological parameters of the queen scallop Aequipecten opercularis (Linnaeus, 1758) caltured in captivity

Seasonal changes in environmental parameters affect the metabolic activities and physiology of bivalves. The aim of this study was to determine the impact of environmental parameters on the queen scallop Aequipecten opercularis (Linnaeus, 1758). Scallops were sampled in October 2020 at the Kamenjak Peninsula area, Northern Adriatic. Their culture was maintained for a period of one year in tanks with flowing seawater exchange. To assess the seasonal impact of temperature, pH, and oxygen levels on growth and physiological status, queen scallops were sampled from the tanks four times a year and morphometric parameters, somatic indices and condition index were measured. Seasones had the greatest impact on the scallop's soft body weight, followed by the bivalve total weight, and finally on the morphometric characteristics. The highest condition index was recorded in autumn (94.04%) and the lowest in summer (46.67%). Somatic indices varied during the seasons ; the muscle index was lowest in summer (3.81%) and the highest in winter (5.96%) while the gonadosomatic index is lowest in autumn (18.01%) and highest in spring (34.06%). The wet soft body weight and the condition index are dependent on the seawater temperature and pH, while morphometric parameters were less influenced by environmental factors.

aquaculture, indices, morphometry, scallops

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