Feeding ecology, growth and reproductive biology of round goby Neogobius melanostomus (Pallas, 1814) in the brackish Kiel Canal
- 150 Downloads
We studied diet, growth and reproductive biology of round goby Neogobius melanostomus from the Kiel Canal, northern Germany, to give an insight into the life cycle of this species in a brackish water canal. Crustaceans had the highest importance in the diet of all examined size classes of round goby. Other major food taxa were annelids and chironomids. Mussels and fish were consumed almost exclusively by medium- and large-sized N. melanostomus and contributed to the diet to a minor extent. In addition to the variability between size classes, we found a high interannual variability in the prey species. Round goby in the Kiel Canal was characterised by relatively low asymptotic total length and high relative fecundity. An almost balanced sex ratio indicates the established status of the population. The highest spawning activity took place between May and the end of June. From our data, negative effects of round goby on native species due to competition for prey and habitat are more likely than due to direct predation on eggs or fry. Affected species with similar habitat requirements are for example small gobiids from the genus Pomatoschistus. As round goby occurs in high abundance, substantial changes of the Kiel Canal ecosystem seem possible and likely.
KeywordsGobiidae Invasive species Diet analyses Fecundity Sex ratio
We thank the fishermen Hans Brauer, Matthias Pfalzgraf and Thomas Philipson, as well as Marius Danielo Behrens for teamwork at the study site. Thanks to Björn Kullmann for his help in the laboratory. Thanks to Simon Weigmann, the anonymous reviewer and the handling editor for their constructive recommendations on an earlier version of the manuscript. This study was the result of a cooperation between the University of Hamburg and the State Agency for Agriculture, Environment and Rural Areas, Schleswig-Holstein, Germany.
It was partially funded by the fisheries tax of Schleswig-Holstein, Germany.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All applicable international, national and/or institutional guidelines for the care and use of animals were followed by the authors.
Sampling and field studies
All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities and are mentioned in the acknowledgements, if applicable.
- Azour F (2011) Fødebiologi hos den sortmundede kutling Neogobius melanostomus i danske farvande. Bachelor thesis, University of CopenhagenGoogle Scholar
- Charlebois PM, Marsden JE, Goettel RG, Wolfe RK, Jude DJ, Rudnicka S (1997) The round goby, Neogobius melanostomus (Pallas), a review of European and North American literature. Illinois-Indiana Sea Grant Program and Illinois Natural History Survey INHS Special Publication 20Google Scholar
- de Mendiburu F (2015) Agricolae: statistical procedures for agricultural research. R package version 1.2-3. https://CRAN.R-project.org/package=agricolae. Accessed 14 Oct 2016
- Debus L (1987) Nahrungsökologische Untersuchungen an juvenilen Bleien (Abramis brama) und Plötz (Rutilus rutilus). Dissertation, University of RostockGoogle Scholar
- Debus L, Winkler HM (1996) Hinweise zur computergestützten Auswertung von Nahrungsanalysen. Rostocker Meeresbiol Beiträge 4:97–110Google Scholar
- Gertzen S (2016) The ecological niche of invasive gobies at the lower Rhine in intra- and interspecific competitive and predatory interactions. Dissertation, University of CologneGoogle Scholar
- Gruľa D, Balážová M, Copp GH, Kováč V (2012) Age and growth of invasive round goby Neogobius melanostomus from middle Danube. Cent Eur J Biol 7:448–459Google Scholar
- Kafemann R (2000) Räumliche und zeitliche Veränderungen der Struktur einer Brackwasserfischgemeinschaft und ihre Steuerung durch abiotische Umwelteinflüsse – Eine fischbiologische Studie im Nord-Ostsee-Kanal. Dissertation, University of HamburgGoogle Scholar
- Knörr C (2013) Gobies of the genus Pomatoschistus gill, 1863 in the Kiel Canal and lower Trave system: distribution and feeding ecology. Master Thesis, University of HamburgGoogle Scholar
- Lappalainen A, Rask M, Koponen H, Vesala S (2001) Relative abundance, diet and growth of perch (Perca fluviatilis) and roach (Rutilus rutilus) at Tvärminne, northern Baltic Sea, in 1975 and 1997: responses to eutrophication? Boreal Environ Res 6:107–118Google Scholar
- Lederer AM, Janssen J, Reed T, Wolf A (2008) Impacts of the introduced round goby (Apollonia melanostoma) on dreissenids (Dreissena polymorpha and Dreissena bugensis) and on macroinvertebrate community between 2003 and 2006 in the littoral zone of Green Bay, Lake Michigan. J Great Lakes Res 34:690–697CrossRefGoogle Scholar
- Miller PJ (1986) Gobiidae. In: Whitehead PJP, Bauchot M-L, Hureau J-C, Nielsen J, Tortonese E (eds) Fishes of the North-eastern Atlantic and the Mediterranean, vol 3. UNESCO, Paris, pp 1019–1085Google Scholar
- Oksanen J, Blanchet FG, Kindt R, Legendre P, Minchin PR, O’Hara RB, Simpson GL, Solymos P, Stevens MHH, Wagner H (2015) Vegan: community ecology package. R package version 2.3-2. http://CRAN.R-project.org/package=vegan. Accessed 14 Oct 2016
- Tomczak MT, Sapota MR (2006) The fecundity and gonad development cycle of the round goby (Neogobius melanostomus Pallas 1811) from the Gulf of Gdańsk. Oceanol Hydrobiol Stud 35:353–367Google Scholar
- Velkov B, Vassilev M, Apostolou A (2014) Growth, age and size structure of the round goby (Neogobius melanostomus) from its main habitats in Bulgarian waters. Hydro Medit 2014, November 13–15, Volos Greece, pp 466–471Google Scholar
- WSD Nord (2015) Der Nord-Ostsee-Kanal, international und leistungsstark. Wasser- und Schifffahrtsverwaltung des Bundes. http://www.wsv.de/service/publikationen/WSV/NOK_Broschuere_Nov._2015_final_.pdf. Accessed 30 Aug 2016