“…Murmansk Region is one of the largest developed and urbanised parts of the Northern-European Russia. Due to extensive pollution of the water bodies in the second half of the 20 th century, the focus of researchers has been on fishes as the bioindicators ( Reshetnikov 1968 , Reshetnikov 1980 , Moiseenko 1983 , Moiseenko 1991 , Moiseenko 1996 , Moiseenko 1997 , Moiseenko 2000 , Moiseenko 2002 , Moiseenko and Yakovlev 1990 , Nost et al 1991 , Nost et al 1997 , Lukin and Kashulin 1992 , Lukin 1998 , Moiseenko et al 1994 , Sharova and Lukin 2000 , Kashulin et al 1999 , Kashulin et al 2005 , Kashulin et al 2007 , Kashulin et al 2009 , Moiseenko and Lukin 1999 , Moiseenko et al 2002 , Kashulin 2004 , Terentyev 2005 , Lukin et al 2006 , Reshetnikov et al 2011 , Reshetnikov et al 2020 , Koroleva et al 2012 , Terentyev and Kashulin 2012 , Zubova 2015 , Zubova et al 2015 , Zubova et al 2016 , Zubova et al 2018 , Zubova et al 2020a , Zubova et al 2020b , Zubova et al 2020c , Terentyev et al 2017 , Terentyev et al 2019 , Denisov et al 2020 ). Fishes are an essential part of any aquatic ecosystem and as members of trophic nets, they also have a large economic value as a food source for humans.…”