Funding for this research was provided by:
European Structural Funds (ITMS: 26110230078)
Article History
Received: 6 January 2021
Accepted: 23 April 2021
First Online: 12 May 2021
Declarations
:
: Naturally deceased bullhead (<i>Cottus</i>) bodies were used in the study. Their collection and subsequent manipulation took place according to ethical principles and with permission No. 999212018-6.3, Ministry of the Environment of the Slovak Republic, Department of State Nature and Landscape Protection, from date 21.11.2018.
: Not applicable
: The authors declare no competing interests.