E. A. Kurashov
Institute of Limnology RAS, the branch of St. Petersburg Federal Research Center of the Russian Academy of Sciences; St. Petersburg Branch of the Federal State Budget Scientific Institution ”All-Russian Scientific Research Institute of Fisheries and Oceanogra phy” (GosNIORKh named after L.S. Berg)
Russian Federation

N. M. Arshanitsa
St. Petersburg Branch of the Federal State Budget Scientific Institution ”All-Russian Scientific Research Institute of Fisheries and Oceanogra phy” (GosNIORKh named after L.S. Berg)
Russian Federation

A. A. Stekolnikov
Saint Petersburg State University of Veterinary Medicine
Russian Federation

M. A. Barbashova
Institute of Limnology RAS, the branch of St. Petersburg Federal Research Center of the Russian Academy of Sciences
Russian Federation

M. P. Grebtsov
Saint Petersburg State University of Veterinary Medicine
Russian Federation