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Pike Cannibalism, Paratenic Hosts, and Trematode Life Span as Factors Influencing the Distribution of Azygia lucii in the Definitive Host Population

  • PARASITOLOGY OF HYDROBIONTS
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Abstract

The ratio of the body length of trematodes Azygia lucii and the body length of pikes in the population of the Rybinsk Reservoir has been studied. The material was collected in September–October from 2018 to 2021. A total of 386 pikes are divided into seven size classes according to body length (range 4.7–83 cm). The prevalence of A. lucii increases from 14.2% in underyearlings to 46.2% in pikes 9+. The distribution of the trematodes in all size classes is aggregated. The usual intensity of invasion is 1–3 trematodes in all classes; the proportion of fish with this intensity of invasion varies from 62.5 to 83.3%. A total of 259 worms are measured. The body length of the worms ranges from 0.49 to 3.5 cm. The average length of A. lucii increases with host size from 1.39 cm in underyearlings to 2.39 cm in older pikes. The largest trematodes (3–3.5 cm long) are found in the largest pikes. Distribution/redistribution of trematodes in the pike population occurs due to pike cannibalism. Due to this, a group of trematodes is formed in large pikes, consisting of worms of different ages and sizes. An important role in the formation of such groups of trematodes is played by paratenic hosts. Their significance depends on their infection rate and the proportion in diet of pike in a particular reservoir. The features of the biology of A. lucii (large body size and short contact of trematodes with mollusks) suggest a long lifespan of marites.

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This work was carried out as part of State Task of the Ministry of Education and Science 121051100100-8.

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Conflict of interests. The authors declare that they haveno conflicts of interest.Statement on the welfare of animals. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Zhokhov, A.E., Pugacheva, M.N. Pike Cannibalism, Paratenic Hosts, and Trematode Life Span as Factors Influencing the Distribution of Azygia lucii in the Definitive Host Population. Inland Water Biol 16, 127–135 (2023). https://doi.org/10.1134/S1995082923010170

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