None.
♀ Zaya (transfer ≤ 2024-Apr)
♀ Lyalechka (transfer ≤ 2023-Jul)
♂ Khoma (death 2023-Jun-15)
♀ Lyusya (death ≥ 2021)
♂ Svyatogor (transfer 2021-Jun-13)
♀ Yefrosinya (transfer 2021-Jun-13)
♂ Yakut (death 2020-Dec-16)
♀ Antonina (transfer ≥ 2008-Jun)
♀ Bulka II (transfer ≥ 2008-Jun)
♂ Pufik (transfer ≥ 2008-Jun)
♀ Maya (transfer ≤ 2008-Apr-14)
♀ Alina (transfer 2008)
Founded in 1978, the Utrish Marine Station describes itself as "an interlaboratory hospital for studying marine mammals and fish". It is located at coordinates 44.705351°, 37.470678°. It is operated by the Institute of Ecology and Evolution named after A. N. Severtsov of the Russian Academy of Sciences (Институт проблем экологии и эволюции имени А. Н. Северцова Российской академии наук), or ИПЭЭ РАН.
A document shared by the Orcinus Center stated that four Utrish-owned or held walruses died from 2019 to 2023; at this time, I only have confirmation of two deaths within that timeframe. A third death is strongly believed to be Lyusya, who was last sighted at the facility in 2021; the fourth is not known at this time. The document further states that there were then two surviving Utrish-owned walruses, both on loan to other facilities -- one being walrus Lyalechka at the Gelendzhik Dolphinarium, and the other being walrus Zaya at the Anapa Dolphinarium on Bolshoy Utrish.
2024-Sep-18. ОРЦИНУС. [Telegram post]. Retrieved from Telegram [archive]
2022-Jun-23. Дмитрий Зайцев. Дельфинарий не вернется в Петербург. Retrieved from Комсомольская Правда [archive]