Abstract
Based on data from catches conducted in April through September 2021ц2025 in three areas of the Avacha Bay intertidal zone, the impact of the harmful algal "bloom" on the fish community of this biotope in the autumn of 2020 was assessed, as well as the dynamics of the relative abundance and size-age structure of its most common representative, the stone cockscomb Alectrias alectrolophus. The obtained data indicate that the mixing of water by the surf, as well as by the ebb and flow of the tides, apparently allowed the inhabitants of this biotope not only to successfully survive the unfavorable environmental situation that arose but also to derive from it a certain benefit for their life activities, involving the increasing number of stone cockscomb in the intertidal zone due to the abundance of food resources and a slight increase in its growth rate, an increased survival rate of young fish living here, and the appearance of larvae of the smooth lumpsucker Aptocyclus ventricosus, a species not recorded in the area since 2014, in the intertidal zone.