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January 30, 2019, while on a scientific mission in Vietnam, Alexander Boltachev, the head of plankton department of IMBR RAS, passed away. He was a widely erudite ichthyologist, ecologist, patriot, and defender of the nature of Crimea and the Black Sea. Alexander Boltachev is the author of numerous articles and a number of monographs that are encyclopedic reference books on marine and freshwater fish of the Crimean peninsula. His untimely death is a bitter loss for our institute.