In 2017-2019 in the coastal zone of the Curonian lagoon, investigation of phytoplankton and zooplankton was carried out, as well as the effect of water from the Curonian lagoon on the survival and fertility of the test organisms Daphnia magna and Ceriodaphnia affinis in acute and chronic experiments was estimated. Samples were taken monthly from January to December. As a result, the toxic effect of "blooming" of Cyanobacteria and, as in particular, Microcystis spp. on plankton test organisms and zooplankton in general was observed. Water from the Curonian lagoon had the most negative impact on plankton test organisms and the zooplankton community from June to September-October 2017-2018, as well as in August-September and November 2019.
На о снове результатов специализированной траловой съемки определены основные места концентрации молоди русского осетра в зависимости от характера донных грунтов, видового состава и обилия кормовых организмов и биологических показателей молоди в северо-западной части Каспийского моря. Определен спектр питания различных весовых групп осетра. Приведены данные по пополнению популяции осетра с учетом имеющихся коэффициентов промыслового возврата. Ключевые слова: северо-западная часть Каспийского моря, сеголетки русского осетра Acipenser gueldenstaedtii, питание, кормовые организмы, зообентос, численность молоди, укрупненная навеска.
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