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Marine shellfish have become commercially very important species because of increasing global seafood consumption in recent years. Despite the high potential for aquaculture and the long tradition of the Croatian shellfish industry, it is based exclusively on two shellfish species; Mediterranean mussel and European flat oyster Ostrea edulis. Croatian shellfish farming is still small-scale and very traditional (BOGDANOVIĆ et al., 2014). The most important area of shellfish farming in northern Adriatic Sea is Lim Bay. Translocation of mussels from natural spawning grounds to sites with favorable conditions for growth is practiced in numerous countries (FAO, 2015). Improvements in stocking strategy and management could increase the yield of mussels that are translocated from wild mussel resources and thereby enhance the sustainability of aquaculture. Understanding how marine bivalves respond to translocation and how rapidly new adaptations can evolve is key to predicting how mussels will respond to environmental changes. The capacity of an individual to respond to a variety of stimuli (changing its physiology, The ability of mussels to cope with environmental conditions depends on the species’ capacity to acclimate or adapt within its morphometric and physiological parameters. In the present study, we investigated the effect of aquaculture site and translocation on different stocks of Mediterranean mussel, Mytilus galloprovincialis Lamarck, 1819. We used shell morphological ratios (width/length, height/length and height/width) and allometric relationships (volume-length and shell weight-length) in addition to condition index (wet meat weight/total weight) and mortality to compare cultivated and translocated mussels from the northern Adriatic Sea, Croatia. Mussels were collected from five cultivation areas (Lim, Pomer, Raša, Vabriga and Budava), and then moved for three months to experimental station at marine protected area in Lim Bay. Differences between cultivated mussels suggested morphological plasticity, although translocation weakly affected allometric relationships. Decrease in condition index was pronounced in translocated mussels, indicating adaptation to different local environmental conditions. High post translocation mortality was observed in mussels transferred to the experimental area. Our study shows plastic response of M. galloprovincialis, which can provide a useful information of mussel stocks selection in aquaculture.

Adaptation of cultured mussel Mytilus galloprovincialis Lamarck, 1819 from the northern Adriatic Sea to nearby aquaculture sites and translocation