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Description: English: A gudgeon Nederlands: Een zwartbekgrondel. Date: 19 August 2011. Source: Own work. Author: Peter van der Sluijs.
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Description: English: A round goby can change of color Nederlands: Zwartbekgrondels kunnen ook van kleur veranderen. Date: 26 May 2014. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Large blackmouth gudgeon with a length of 17 centimetres (6.7 in) caught with a fishing rod in Holland Nederlands: Hele grote zwartbekgrondel van 17cm gevangen aan een hengel in Nederland. Date: 1 July 2012. Source: Own work. Author: Peter van der Sluijs.
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Description: Polski: Babka bycza. Date: 17 February 2018, 15:37:39. Source: Own work. Author:
MOs810.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 14 July 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round gobies are originally not from Netherlands Nederlands: Zwartbekgrondels komen oorspronkelijk niet uit Nederland. Date: 28 May 2017. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby with a black spot on the first fin Nederlands: Zwartbekgrondel met een zwarte vlek op de eerst rugvin. Date: 3 August 2013. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 22 July 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 9 May 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Tail fin of round goby Nederlands: Staart van een zwartbekgrondel. Date: 14 July 2013. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby on stone Nederlands: Zwartbekgrondel op steen. Date: 14 July 2013. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 20 May 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 14 July 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Male round goby Nederlands: Mannetje zwartbekgrondel. Date: 7 May 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: A round goby caught in Holland Nederlands: Zwartbekgrondel gevangen in Nederland. Date: 14 July 2013. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 5 May 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby male Nederlands: Zwartbekgrondel mannetje. Date: 10 May 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: In the Netherlands, the round goby becoming a plague Nederlands: In Nederland wordt de zwartbekgrondel steeds meer een plaag. Date: 20 July 2014. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 24 June 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 28 July 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 7 May 2018. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Exotics such as the round goby eat worms, etc. Nederlands: Exoten zoals de zwartbekgrondel vreten wormen e.d. Date: 23 July 2016. Source: Own work. Author: Peter van der Sluijs.
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Description: English: Round goby Nederlands: Zwartbekgrondel. Date: 20 July 2013. Source: Own work. Author: Peter van der Sluijs.
