Characteristics of fucus algae cenopopulations near the Popov island of the White Sea

Abstract

   The aim: Determination of the biological characteristics of fucus algae cenopopulations for the development of recommendations for their rational exploitation.   Method: The original data obtained in 2020–2022 according to the recommended methods of fisheries research were used.   Novelty: The size, age and sex structures of cenopopulations and reproduction of three species of fucus algaeof the intertidal zone of the White Sea are analyzed.   Result: Studies in 2020–2022 in the intertidal zone of Popov Island confirmed the stable state of cenopopulations of commercial fucus algae. Fucus algae settlements in the littoral is a fishing area with dense thickets, an estimated specific stock of 630.3 t/km. Extended sporulation of F. vesiculosus in the area of Popov Island from June to the end of October allows the formation of several age generations of seedlings. Together with vegetative reproduction, this significantly increases the survival of the cenopopulation and its resistance to climatic influences. The age of fertility in the studied areas is less than according to the literature data. In terms of resistance to environmental impact and survival, the dominant species can be put in the following order based on the characteristics of reproduction, area and density of juvenile settlements, and abundance in the intertidal zone: Fucus vesiculosus → Ascophyllum nodosum → Fucus distichus.   Practical significance: Based on the data on the reproduction of commercial fucus algae near the Karelian coast of the Onega Bay, it is recommended to start harvesting algae in the littoral no earlier than July 1 after the end of the generative period in the most vulnerable species.