On the beginning of the March, we analysed settlement of the oysters on the collectors deployed in the August 2018. As species identification of small specimens could be a real challenge, we also performed some molecular analysis to identify was it O. edulis or M. gigas.
We continued with sampling in the main ports and aquaculture sites along the eastern Adriatic coast. In only one week we droved 2000 km and sampled from Dubrovnik on the south to the Lim bay on the north. Project Co-PI Dr Elizabeta Briski joined us on this part of sampling and collected samples were send to her lab at GEOMAR and waiting for molecular analysis.
In collaboration with Istrida d.o.o. we prepare collectors for the oyster spat. Lines with spat collectors were placed in several locations within Lim Bay.
In cooperation with NP “Brijuni” team members performed a visual census survey at 4 different locations within the park. We collected the first data about distribution and abundance of invasive oyster species in NP “Brijuni”. During dives besides counting and measuring oysters we had the opportunity to enjoy untouched underwater beauty and this field trip will probably remain the best field trip of this project :)
Visual census survey was performed in May at 12 different locations along the west Istria coast. With precious help of Dr Leon Grubišić and Luka Čulić, team members collected first data about distribution and abundance of invasive species in the eastern Adriatic Sea.
Samplings of bivalve larvae were performed in the main ports along the eastern Adriatic coast (Pula, Zadar, Šibenik, Split, Ploče and Dubrovnik) and in the main aquaculture sites (Lim Bay and Mali Ston Bay). Collected samples will be sent to the Dr Briski lab at GEOMAR for the further molecular analysis.
A feeding experiment was performed in April in Lim Bay. The aim of the experiment is to see differences in utilization of the available food among two oyster species: Ostrea edulis and Crassostrea gigas. This experiment is part of the MSc thesis of Petra Kundid.
We analysed beam trawl commercial catch during one-day fishing activity. All oysters specimens were separated form the catch and species were determined. Good news – there is no C. gigas in the beam trawl catch.
Filed work for the project started in the Lim bay with the strong support of Emil and Ivan and their workers from Istrida doo. We marked over 300 C. gigas for the growth analysis, collected specimens of both oyster species for the analysis of reproduction, feeding habits and trace elements in the shell. We will continue with sampling on monthly basis. Stay tuned.
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