10/24/2023 0 Comments Hawaiian dredging max matsunobuin a silver bream (Blicca bjoerkna L.) population. Host switch and infestation by Ligula intestinalis L. intestinalis as a natural source of endocrine disruption in fish. Together, these data provide valuable information on the role of FSH and LH as mediators of parasite-induced sterilization in a vertebrate and implicate the selective inhibition of host reproduction by L. intestinalis on reproductive parameters of roach appeared to be independent of the parasite burden. These findings indicate the involvement of FSH rather than LH in mediating effects of infection early during gonad development in roach. Under controlled laboratory conditions infected roach showed lower mRNA levels of FSHbeta but not of LHbeta, despite histology revealing similar gonad stages as in uninfected conspecifics. As revealed by quantitative PCR, infection was accompanied by essentially lower pituitary expression of follicle-stimulating hormone beta-subunit (FSHbeta) and luteinizing hormone beta-subunit (LHbeta) mRNA compared with uninfected roach, providing clear evidence for gonadotropin-insufficiency as the cause of arrested gametogenesis. Field studies on roach demonstrated that in both genders infection prevented gonad development. intestinalis on reproductive parameters of roach (Rutilus rutilus, Cyprinidae), a common fish host of this parasite. In the present study we investigated the effects of infection by L. However, mechanistic studies are rare and the proximate cues leading to impaired reproduction still remain unknown. Plerocercoids of the tapeworm Ligula intestinalis ( Cestoda: Bothriocephalidea) have been reported to inhibit gametogenesis of their intermediate fish hosts. Trubiroha, Achim Wuertz, Sven Frank, Sabrina N Sures, Bernd Kloas, Werner Expression of gonadotropin subunits in roach (Rutilus rutilus, Cyprinidae) infected with plerocercoids of the tapeworm Ligula intestinalis ( Cestoda).
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