The Big Bad Round Goby

In our project regarding release of Round Goby-eating turbot; transects in GuldborgSund has been conducted.
This is done to monitor the population of black goby, but also to see if there is an effect on the release of turbot to the waters of Guldborgsund.
This day we collected a specimen (Hand-caught) that was 17.5 cm. Note, the black spot on the front dorsal fin. A sure sign to distinguish Round Goby from other goby species.