How old are you—Evaluation of age reading methods for the invasive round goby (Neogobius melanostomus, Pallas 1814)

Ann-Britt Florin*, Karin Hüssy, M. Blass, D. Oesterwind, Riikka Puntila, D. Ustups, C. Albrecht, Y. Heimbrand, E. Knospina, K. Koszarowski, A. Odelström

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

90 Downloads (Pure)


In the Baltic, the first observation of the round goby (Neogobius melanostomus, Pallas 1814) was made in 1990. Within the past decade the species became invasive and spread rapidly throughout the Baltic Sea. Studies about the fishes potential impacts on resident species promote the need for an increasing knowledge of their basic stock structures such as growth rates, longevity and mortality, which all rely on accurate estimates of age. Former studies on the round goby have used several different age reading techniques. In this study, we compared three standard otolith preparation methods for ageing and present the best procedure for the invasive round goby. The results showed significant differences in age estimates of the same fish between the different preparation methods and between readers. The estimation of the first annulus, the first year, was the most problematic. The overall agreement was lowest when reading the whole otoliths while the best performance was achieved with sectioned and stained preparation method. Depending on method used the growth estimates
also differed. The results question comparability between previous studies and
highlight the importance of harmonised aging procedures for the round goby for obtaining correct estimates of population parameters such as growth rate, age at maturity, and longevity
Original languageEnglish
JournalJournal of Applied Ichthyology
Issue number3
Pages (from-to)653-658
Publication statusPublished - 2018


Dive into the research topics of 'How old are you—Evaluation of age reading methods for the invasive round goby (Neogobius melanostomus, Pallas 1814)'. Together they form a unique fingerprint.

Cite this