Microbiological studies of the round goby ( Neogobius melanostomus) from the Puck Bay, southern Baltic Sea

In summer 2017 numerous dead round gobies (Neogobius melanostomus) and individuals
covered with white coating were observed in the Puck Bay. The aim of our research was
to determine the microbiological composition of the round goby from the Puck Bay, focusing on
the presence of pathogens. Bacteria were identified by biochemical methods and, by sequencing
of 16S rRNA. The dominant bacterial species were Shewanella baltica, Pseudomonas spp.
and Aeromonas spp. - opportunistic pathogens, commonly present in many fish species, which
may become harmful for the organism in unfavorable conditions. It was the first trial to determine
the composition of the bacterial flora of N. melanostomus from that area.