1st record: Northern Quark Islands (Ostra Qvarken)/Finland/Gulf of Bothnia (1990s, Leppakoski and Olenin 2000)

Northern Quark Islands (Ostra Qvarken)/Finland/Gulf of Bothnia (1990s, Leppakoski and Olenin 2000)

Economic Impact		Industry
In the Baltic Sea, where it is the only barnacle species present, A. improvisus is reported to contribute to hull fouling of ships and the fouling of power plants (Vuorinen et al. 1986). Costs of fouling of power plants in Swedish waters were estimated at 10-38 SK (=1.5-5.5 million dollars) per year (Gren et al. 2009).

Economic Impact		Shipping/Boating
In the Baltic Sea, where it is the only barnacle species present, A. improvisus is reported to contribute to hull fouling of ships and the fouling of power plants (Vuorinen et al. 1986). Costs of fouling of recreational boats in Swedish waters, due to A. improvisus were estimated at 122-331 million Swedish kroner, SK, equal to 8-49 million dollars, per year. Fouling of commercial vessels was estimated at 33-49 SK, equal to 5-7 million dollars, per year, for a total cost of 23-56 million dollars per year (Gren et al. 2009).

Ecological Impact		Habitat Change
In the Gulf of Bothnia, A. improvisus was classified as having some habitat impacts, by fouling eelgrass and algae (Bostrom and Bonsdorff 1997 and Raberg and Kautsky 2007, cited by Zaiko et al. 2011).

Species Regional Summary Amphibalanus improvisus None ( B-XII )