Rasprostranjenost nezavičajne vrste kamenice Magallana gigas(Thunberg, 1793) duž istočne obale Jadrana

Abstract

The aim of this research was to summarize existing and novel data on the distribution of M. gigas in coastal areas of the Eastern Adriatic and to provide a baseline for the future monitoring and assessment programmes of the species. Distribution of M. gigas was determined by three different methods: (i) a visual census of the presence of M. gigas specimens in the medio-littoral zone; (ii) DNA identification of M. gigas larvae in the water column; and (iii) the presence of M. gigas in the subtidal zone at depth between 25 and 40 m. Magallana gigas has a well-established population in the medio-littoral zone of natural and anthropogenic habitats along the coast of the North-eastern Adriatic Sea (west coast of Istria peninsula), but it is not present in the deeper layers . In the Central-eastern and South-eastern Adriatic Sea, the species was either absent or sporadically recorded with no evidence of fully established populations. Considering the great invasion success of M. gigas worldwide and effects that this species could have on the invaded ecosystem (e.g. competition for food and space with native species), detailed future monitoring is needed for the Eastern Adriatic Sea.

Sustainable Management of High-Impact Non-Native Molluscs and Their Potential Commercial Importance in the Eastern Adriatic Sea

“…Since these observations were made before Pacific oyster aquaculture introduction in the Adriatic Sea, they may be related to the introduction of M. angulata in 1966 [92] or to another vector (shipping). In the northern Adriatic, wild populations of M. gigas are established on rocky shores in Italy [46], Slovenia [62], and Croatia [49,52,57,74]. The first record of M. gigas in the waters of Slovenia dates back to 1971 [91]; in Montenegrin waters, to 1977 [179]; while in Albanian waters, it was first detected in 2001 [180].…”

“…In 1972, M. gigas was intentionally introduced into Lim Bay (Istria, Croatia) to study its potential for aquaculture [184,185], but it was never commercially farmed in Croatia [75]. In the central and southern Croatian Adriatic, the species is recorded only sporadically [74], probably due to the main Adriatic current [75]. Dense aggregations of M. gigas were found in the Lim Bay (Croatia), a nationally important shellfish farming area [57].…”

“…Research studies on high-impact non-native molluscs in the eastern Adriatic Sea are mainly related to specific projects, such as BALMAS, a ballast water management system for Adriatic Sea protection (2013-2016); ALKA, for the identification and distribution of the invasive species Crassostrea gigas in the Adriatic Sea (2014)(2015); or COCOA, which monitors competition between native Ostrea edulis and invasive Crassostrea gigas oysters in the Adriatic Sea-including their effects on the ecosystem, fisheries, and aquaculture (2021)(2022)(2023)(2024)(2025)(2026). Following the inventory of high-impact non-native mollusc species in Croatian waters by [71], published papers mostly deal with the distribution or ecology of high-impact non-native molluscs [49,50,52,56,57,[73][74][75][76]. However, research on the management and continuous monitoring of high-impact non-native mollusc species in Croatian waters is still lacking.…”