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The Caspian Sea, world largest lake, is bordered by Azerbaijan Republic, Islamic Republic of Iran, Kazakhstan, Republic, Russian Federation and Turkmenistan. Its biodiversity is comprised of 1354 plant, animal and more than 122 fish species. Out of 122 fish species and subspecies living in the Caspian Sea, 40 species are commercial and presently 25 species are the main exploited fish. The Caspian Sea fishes are divided to four main groups, including 53 species Marine fishes (43.5%), 42 species (13.4%) of freshwater origin, 18 species (14.7%) anadromous and 9 species (7.4%) semi-anadromous. At present sturgeons, kilka and Caspian Sea seals are considered as shared stocks between Caspian Sea range states.

Каспийй теңізінде ауланған балықтардың 15 түрін ихтиопатологиялық зерттеу нәтижелері бойынша Anisakidae тұқымдасы жататын Anisakis, Contracaecum,Porrocecum тоғышарларының жаппай таралуы анықталады.