Abstract
The embryos within the egg envelope (eggs) and cydippid stage larvae of alien species of ctenophore Mnemiopsis leidyi were recorded in the South-Eastern Baltic Sea (within the economic zone of the Russian Federation) in the autumn of 2021. The adults of Mnemiopsis leidyi were not found. The data on the occurrence and distribution of ctenophore in the early stages of development in the SEB were given. The ctenophore eggs were recorded in the open part of the SEB at the stations with the depths of 65-115 m in the intermediate layer and below the upper boundary of the halocline. A large number of eggs (51-57 ind./m3) were observed on the north-eastern slope of the Gdansk Deep. The area of occurrence of ctenophore eggs in 2021 increased compared to the data of 2010-2015. The significant correlation between the eggs abundance and the water salinity and temperature was not revealed. Using the NEMO 4.0 numerical model, the path of advective water penetration into the study area from the western basins of the Baltic Sea, which probably introduced the ctenophore eggs, was traced.
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