Abstract
The data on the composition of the ichthyofauna and relative quantity of common species of fishes in the littoral and the upper sublittoral zones in the coastal waters of the South-Eastern Kamchatka are provided basing on the analysis of the results of hook catches, collections made in the intertidal zone, and underwater photo- and video records performed in the May – September 2021. The obtained results show that the impact of the negative effect of harmful algal bloom in the autumn of 2020 on the composition of the species and quantity of fishes, inhabiting the intertidal zone, is very insignificant. Unfavorable ecological conditions in the upper sublittoral zone (2–25 m) in the South-Eastern Kamchatka in the autumn 2020 caused decrease the quantity of some fishes (mainly species of the family Stichaeidae) which hide on the bottom in the rock crevices or are buried in silty-sand bottom. But unfavorable ecological conditions practically had no influence on the quantity and mode of life of the representatives of ichthyofauna which were able to leave temporarily the coastal waters with harmful algal bloom areas.
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