As a part of ongoing project MoBI-aqua (n. 100314623), Martin Bláha, Ph.D. visited Technische Universität Dreden (9th - 10th January 2020) to discus results and methodology of molecular studies on Cottus gobio. Moreover, Martin Bláha, Ph.D. presented invited lecture “Native European crayfish species: historical biogeography, current taxonomy, threats and uncertain future” at hydrobiological seminar for university students.