@ARTICLE{Rybczyk_Agnieszka_First_2020, author={Rybczyk, Agnieszka and Czerniejewski, Przemysław and Keszka, Sławomir and Janowicz, Mariola and Brysiewicz, Adam and Wawrzyniak, Wawrzyniec}, number={No 47}, pages={142-149}, journal={Journal of Water and Land Development}, howpublished={online}, year={2020}, publisher={Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute}, abstract={Round goby (Neogobius melanostomus (Pallas, 1814)) is an invasive species in the Oder River. In this study, age of 147 fish was determined using scales and otoliths, and the Fraser-Lee back-calculation method was used for population structure and theoretical length growth rates with 3 mathematical models of growth: von Bertalanffy, Ford–Walford and 2nd degree polynomial. Fish condition was determined using Fulton, Le Cren and Clark equations. Average total length and weight of fish was 162.00 mm and 83.00 g, respectively. Males were more abundant than females, representing 70% of the fish caught, and achieved greater total lengths and weights. Age 2+ dominated females and 3+ males age groups. Of the three mathematical models used to estimate fish growth, the 2nd degree polynomial model had the best fit to back-calculated lengths. Males had slightly higher growth rates than females in the first two years of life but comparable in subsequent years. The diet consisted of various benthic organisms that varied with fish age. The most frequently occurring food com-ponent was Dreissena polymorpha, which accounted for approximately 70% in the diet of fish with a body length greater than 191 mm.}, type={Article}, title={First data of age, condition, growth rate and diet of invasive Neogobius melanostomus (Pallas, 1814) in the Pomeranian Bay, Poland}, URL={http://journals.pan.pl/Content/118044/PDF/Rybczyk%20et%20al%20684.pdf}, doi={10.24425/jwld.2020.135041}, keywords={diet, fish alien species, Gobidae, growth rate, Pomeranian Bay, population structure}, }