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Dead Jellyfish Accumulations on Crimean Coasts Explained as Natural Population Renewal
A biologist from the Russian Academy of Sciences stated that the accumulations of dead jellyfish seen on the coasts of Crimea are part of the species' normal life cycle and an ordinary event related to population renewal.
Accumulations of dead jellyfish seen in videos shared by tourists on the Black Sea and Sea of Azov coasts of Crimea are, according to experts, the result of a natural process.
Boris Anninskiy, a leading researcher and candidate of biological sciences at the A. O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, told RIA Novosti that there is nothing unusual in this situation.
The Short Life Cycle of Jellyfish
Anninskiy stated that jellyfish are not long-lived and that their active planktonic life span usually does not exceed one year. He noted that after the cold-water Aurelia species' breeding period in February-March, the adult population gradually disappears physiologically due to irreversible morphological changes.
The expert said that jellyfish, in particular, lose their ability to regulate their own swimming capability and are often pushed to the sea surface.
Wind and Waves Carry Them to Shore
Anninskiy explained that jellyfish in this state can remain for several more months before dying completely. He noted that wind and waves disperse them throughout the sea and sometimes create coastal accumulations. He stated that such accumulations on the southern coastal areas of Crimea usually form under the influence of southern winds.
The scientist added that young individuals can sometimes also be seen in the accumulations, which cannot recover after being damaged or entering unsuitable temperature and salinity conditions.
Difference in the Sea of Azov
Anninskiy said that for the jellyfish species rhizostoma (corneroto) in the Sea of Azov, the peak of similar processes coincides with August-September. He stated that the death process spreads over the autumn-winter months, but due to their large mass, most rhizostomas sink to the seabed.
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