Fig. 1
From: First record of the non-indigenous jellyfish Blackfordia virginica (Mayer, 1910) in the Baltic Sea
Sampling stations which have been investigated for presence (red triangle) or absence (black circles) of the hydromedusa Blackfordia virginica in the Baltic Sea (73 stations investigated during August 2017), Kiel Canal (one station sampled from 2010 to 2017), qualitative sampling station in Kiel Fjord (September–October 2017) and the Bornholm Basin (45 BB stations during August 2008–2016, June 2010–2012 and 2014–2017 and Sept. 2016, BB01-BB45)