LIGULA INTESTINALIS PDF

The dynamics of the emergence, duration, and decline phases in epizootic cycles are well known for humans and some crops, but they are poorly understood for host-parasite systems in the wild. Parasites may be particularly insidious as they are often introduced unintentionally, simultaneously with their hosts, and later transferred to species in the new location. Here we investigate the epizootic dynamics of the tapeworm Ligula intestinalis in the Hamiz reservoir, Algeria, and explore its effects on the cyprinid fish Barbus callensis. Regular sampling was conducted from October to February with intermittent surveys carried out until Five percent of the specimens of B. There was no obvious difference in weight between uninfected fish and infected ones, and infection did not affect fish condition.

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The tapeworm Ligula intestinalis occurs in the body cavity of its cyprinid second intermediate host, in this study the roach Rutilus rutilus, and inhibits host gonadal development. The mechanism by which infected fish are prevented from reproducing is unknown. Comparison of parameters, such as body length and weight, and condition factor and age, between infected and uninfected individuals, indicated only minor effects of parasitism on growth and condition. In contrast, seasonal gonadal development, as observed in uninfected fish, did not occur in infected fish, and gonads remained small and blocked at the primary oocyte stage in female roach.

As immature ovaries and testes are still present, the parasite is presumed to act upon the brain-pituitary-gonadal axis of the fish to inhibit further development of reproductive organs. This site needs JavaScript to work properly. Please enable it to take advantage of the complete set of features! Clipboard, Search History, and several other advanced features are temporarily unavailable.

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Similar articles Expression of gonadotropin subunits in roach Rutilus rutilus, Cyprinidae infected with plerocercoids of the tapeworm Ligula intestinalis Cestoda. Trubiroha A, et al. Int J Parasitol. Epub May PMID: Inhibition of gametogenesis by the cestode Ligula intestinalis in roach Rutilus rutilus is attenuated under laboratory conditions. Epub Nov Naturally-induced endocrine disruption by the parasite Ligula intestinalis Cestoda in roach Rutilus rutilus. Gen Comp Endocrinol. Epub Aug Mutations along the pituitary-gonadal axis affecting sexual maturation: novel information from transgenic and knockout mice.

Huhtaniemi I. Mol Cell Endocrinol. PMID: Review. The brain-pituitary-gonad axis in male teleosts, with special emphasis on flatfish Pleuronectiformes. Weltzien FA, et al. Show more similar articles See all similar articles. Cited by 8 articles Impacts of crustacean invasions on parasite dynamics in aquatic ecosystems: A plea for parasite-focused studies.

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PLoS One. Show more "Cited by" articles See all "Cited by" articles. Publication types Research Support, Non-U. Gov't Actions. MeSH terms Animals Actions. Body Burden Actions. Female Actions. Host-Parasite Interactions Actions.

Seasons Actions. Sexual Maturation Actions. Luteinizing Hormone Actions. Full-text links [x] Sheridan PubFactory. Copy Download.

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Ligula intestinalis

The tapeworm Ligula intestinalis occurs in the body cavity of its cyprinid second intermediate host, in this study the roach Rutilus rutilus, and inhibits host gonadal development. The mechanism by which infected fish are prevented from reproducing is unknown. Comparison of parameters, such as body length and weight, and condition factor and age, between infected and uninfected individuals, indicated only minor effects of parasitism on growth and condition. In contrast, seasonal gonadal development, as observed in uninfected fish, did not occur in infected fish, and gonads remained small and blocked at the primary oocyte stage in female roach. As immature ovaries and testes are still present, the parasite is presumed to act upon the brain-pituitary-gonadal axis of the fish to inhibit further development of reproductive organs.

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We'd like to understand how you use our websites in order to improve them. Register your interest. The infection rate by Ligula intestinalis has been studied in 14 fish species Varicorhinus beso, Garra dembecha, Labeobarbus intermedius, L. Plerocercoids have been found only in the fishes of gg. Labeobarbus and Barbus.

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Previous studies have revealed that several parasitic infections can affect host reproduction. Furthermore, in vertebrate hosts, Taenia taeniaeformis appears to directly affect the testis in the rat Lin et al. Ligula intestinalis , which is found in the body cavity of certain cyprinid fish, inhibits reproduction in both male and female fish. The gonads, however, are present but remain in an immature state, irrespective of fish age or season.

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