AB 24:41-52 (2015)  -  DOI: https://doi.org/10.3354/ab00634

Invasion rate and population characteristics of the round goby Neogobius melanostomus: effects of density and invasion history

Farivar Azour1,*, Mikael van Deurs1,2, Jane Behrens1, Henrik Carl3, Karin Hüssy1, Kristian Greisen3, Rasmus Ebert3, Peter Rask Møller3

1National Institute of Aquatic Resources (DTU Aqua), Technical University of Denmark, Jægersborg Allé 1, 2920 Charlottenlund, Denmark
2Department of Biology, Lund University, Sölvegatan 37, Lund, Sweden
3Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Ø, Denmark
*Corresponding author:

ABSTRACT: Round goby Neogobius melanostomus is currently one of the most wide-ranging invasive fish species in Europe and North America. The present study demonstrates how the distribution of round goby has expanded from 2008 to 2013 at a rate of about 30 km yr-1 along the Danish coastline in the western Baltic Sea. Further analyses showed that fish from an established high-density round goby population were slow-growing and displayed poorer condition (weight at age and hepatosomatic index) compared to fish sampled from recently invaded locations (i.e. at the forefront of the distribution range). The established population revealed a broad age distribution and a 1:1 gender ratio, while fish from a recently invaded site were primarily of intermediate ages with a male-biased gender ratio. Otolith analyses suggested that the oldest individuals from the recently invaded area experienced superior growth conditions only in the most recent years, suggesting immigration into the area as adults. Our results suggest that intraspecific competition for food may cause continued dispersal of the species and that population demographics likely relate to invasion history.


KEY WORDS: Range expansion · Density-dependent growth · HSI · Gender ratio · Otolith · Dispersal


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Cite this article as: Azour F, van Deurs M, Behrens J, Carl H and others (2015) Invasion rate and population characteristics of the round goby Neogobius melanostomus: effects of density and invasion history. Aquat Biol 24:41-52. https://doi.org/10.3354/ab00634

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