The invasive cestode Triaenophorus crassus Forel, 1868 (Cestoda, Pseudophyllidea) in fish of the Saratov Reservoir

O.V. Mineeva^*, A.K. Mineev^**

Institute of Ecology of the Volga River Basin, Samara Research Center, Russian Academy of Sciences, Togliatti, 445003 Russia

E-mail: ^*ksukala@mail.ru, ^**mineev7676@mail.ru

Received January 30, 2019

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DOI: 10.26907/2542-064X.2019.2.325-338

For citation: Mineeva O.V., Mineev A.K. The invasive cestode Triaenophorus crassus Forel, 1868 (Cestoda, Pseudophyllidea) in fish of the Saratov Reservoir. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2019, vol. 161, no. 2, pp. 325–338. doi: 10.26907/2542-064X.2019.2.325-338. (In Russian)

Abstract

The infestation of fish in the Saratov Reservoir with the cestode Triaenophorus crassus (Cestoda, Pseudophyllidea) was studied. The material was collected in 2009–2015 from the middle part of the reservoir; complete parasitological dissection of Neogobius melanostomus (Pallas) – 320 ind., Neogobius iljini (Vasiljeva et Vasiljev) – 146 ind., Proterorhinus marmoratus (Pallas) – 21 ind., and Esox lucius (Linnaeus) – 49 ind. was carried out. The plerocercoids of T. crassus were mainly found in the muscles of gobies, also alien to the Saratov Reservoir. The highest invasion rates (50%, 2.15 ind.) were registered in N. iljini, a second intermediate host of the cestode in the Saratov Reservoir. The parasite reaches maturity in pike, a definitive host. The high level of pike infection with the cestode (55.1%, 6.4 ind.) can be due the key role of gobies in pike feeding. The obtained results confirm the ongoing transformation of the system of food chains and the successful adaptation of T. crassus in the reservoir.

Keywords: Triaenophorus crassus, cestode, invasive species, infection, fish, Saratov Reservoir

Acknowledgments. The study was supported by the Program for Basic Research of the Presidium of the Russian Academy of Sciences “The ecology and dynamics of invasive hydrobiont species (zooplankton, zoobenthos, fish, fish parasites) in the water bodies of the Middle and Lower Volga River” and “The influence of invasive species on the dynamics and functioning of biodiversity”.

Figure Captions

Fig. 1. N. melanostomus carrying a plerocercoid of T. crassus (the arrow shows the localization of the parasite).

Fig. 2. T. crassus, scolex hooklets: a – a plerocercoid from N. iljini, magnification Ч50, b – a mature helminth from pike, magnification Ч40.

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