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Abstracts - S4 Biodiversitet & invasive arter
23. Density, biomass and growth of the invasive Round goby Neogobius
melanostomus in Guldborgsund, SE Denmark
Rasmus Ebert, Kristian Greisen, Henrik Carl & Peter Rask Møller
Statens Naturhistoriske Museum, Københavns Universitet, Danmark rasmus.ebert@hotmail.com,
Itp687@alumni.ku.dk, hcarl@snm.ku.dk, pdrmoller@snm.ku.dk
The invasive Round Goby Neogobius melanostomus was first registered in Danish waters in 2008 at
Bornholm, and in recent years its population has exploded rapidly mainly along the coasts of
Lolland-Falster. The expansion of the distribution is followed closely by the national “Marine Fish
Atlas project” www.fiskeatlas.dk, whereas data on density in Danish waters has remained scarce.
The aim of the present study was therefore to determine population densities of N. melanostomus in
the Guldborg Sound, one of the most heavily infected areas. Data were collected in the summer and
autumn 2012, by the use of snorkeling and eel traps. Densities in “Bredningen” were high, reaching
0.35 individuals per m2 on shallow seabed. Neogobius melanostomus was also observed migrating
up the fresh water tributaries. The condition (length-weight-relation) of the population was
significantly lower than in 2010, when their feeding biology in Guldborg Sound was investigated,
indicating possibly starvation of the huge population, due to lack of food items.
Program 17. danske havforskermøde, 43