Naturally-induced endocrine disruption by the parasite Ligula intestinalis (Cestoda) in roach (Rutilus rutilus)

2010 ◽  
Vol 166 (2) ◽  
pp. 234-240 ◽  
Author(s):  
Achim Trubiroha ◽  
Hana Kroupova ◽  
Sven Wuertz ◽  
Sabrina N. Frank ◽  
Bernd Sures ◽  
...  
Keyword(s):  
Endocrine Disruption ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Ligula Intestinalis

scholarly journals Seasonal variation of the plerocercoid ligula intestinalis (L) observed in roach (Rutilus rutilus, L) from the yenice irrigation pond, Çanakkale, Turkey

2004 ◽  
Vol 58 (1-2) ◽  
pp. 127-133 ◽  
Author(s):  
Cemal Oguz ◽  
Öztürk Oguz ◽  
Hayati Güre
Keyword(s):  
Seasonal Variation ◽  
Parasite Species ◽  
Abdominal Cavity ◽  
Rutilus Rutilus ◽  
The Other ◽  
Host Fish ◽  
Roach Rutilus Rutilus ◽  
Mean Intensity ◽  
Ligula Intestinalis ◽  
Irrigation Pond

This study was carried out at the Yenice Irrigation Pond between October 1999 and October 2000. For this study 368 roach (Rutilus rutilus) were examined and 37 parasites and 93 Ligula intestinalis were found in the abdominal cavity of the host (prevalence 10.1%, mean intensity 2.51 specimens/fish). Based on season, the highest number of infected fish occurred during summer (33.3%, 4 parasite/fish), and during the other season the mean intensity of infection was relatively low (prevalence 3.3%, 1 specimens/fish). On the other hand, the parasite species was determined especially on small and medium host fish sizes (2.17-100%). Basic criteria for the assessment of the parasite species of host fish were the general parameters related to parasite populations, which are prevalence, mean intensity, seasonal variation, and relationship between host size and infection.

Inhibition of gametogenesis by the cestode Ligula intestinalis in roach (Rutilus rutilus) is attenuated under laboratory conditions

Parasitology ◽  
2010 ◽  
Vol 138 (5) ◽  
pp. 648-659 ◽  
Author(s):  
ACHIM TRUBIROHA ◽  
HANA KROUPOVA ◽  
SABRINA N. FRANK ◽  
BERND SURES ◽  
WERNER KLOAS
Keyword(s):  
Steroid Receptors ◽  
Gonadosomatic Index ◽  
Plasma Concentrations ◽  
Secondary Growth ◽  
Parasite Burden ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Infected Female ◽  
Ligula Intestinalis ◽  
Laboratory Conditions

SUMMARYReproductive parameters of Ligula intestinalis-infected roach (Rutilus rutilus) which were held under long-tem laboratory conditions with unlimited food supply were investigated. Although uninfected and infected roach showed no difference in condition factor and both groups deposited perivisceral fat, the gonadosomatic-index was significantly lower in infected female and male roach. Quantitative histological analysis revealed that gonad development was retarded upon parasitization in both genders. In contrast to the phenotype described in the field, infected females were able to recruit follicles into secondary growth, but a high percentage of secondary growth follicles underwent atresia. In both genders, the histological data corresponded well with reduced expression of pituitary gonadotropins and lowered plasma concentrations of sex steroids, as revealed by real-time RT-PCR and ELISA, respectively. Furthermore, a reduction of vitellogenin mRNA and modulated expression of sex steroid receptors in the liver was demonstrated. Like in the field, there was a significant adverse impact of L. intestinalis on host reproductive physiology which could not be related to parasite burden. Our results show, for the first time, that maintenance under laboratory conditions can not abolish the deleterious effect of L. intestinalis on gametogenesis in roach, and indicate a specific inhibition of host reproduction by endocrine disruption.

Influence of Ligula intestinalis plerocercoids (Cestoda: Diphyllobothriidea) on the occurrence of eyeflukes in roach (Rutilus rutilus) from a lake in south-east England

2018 ◽  
Vol 93 (1) ◽  
pp. 66-70 ◽  
Author(s):  
N.J. Morley ◽  
J.W. Lewis
Keyword(s):  
Rutilus Rutilus ◽  
Body Cavity ◽  
Infected Fish ◽  
Fish Host ◽  
Helminth Species ◽  
Roach Rutilus Rutilus ◽  
Ligula Intestinalis ◽  
Freshwater Habitats ◽  
Concurrent Infections ◽  
South East England

AbstractVertebrate hosts commonly harbour concurrent infections of different helminth species which may interact with each other in a synergistic, antagonistic or negligible manner. Direct interactions between helminths that share a common site in the host have been regularly reported, but indirect interactions between species that occur in different sites are rarely described, especially in fish hosts. Plerocercoids of Ligula intestinalis are common infections of the peritoneal (body) cavity of roach (Rutilus rutilus) in freshwater habitats. These larval cestodes can cause extensive systemic pathologies to the fish host, which in turn may alter its susceptibility as a target host for other helminth species. The present study, using an existing dataset, investigates the influence of L. intestinalis (ligulosis) on frequently occurring eyefluke infections in roach sampled from a lake in south-east England. The occurrence of two species of eyefluke (Diplostomum sp. and Tylodelphys sp.) in the roach population demonstrated no significant levels of interaction with each other. The prevalence but not mean intensity or abundance of Diplostomum sp. was significantly increased in ligulosed roach, while the incidence of Tylodelphys sp. remained unchanged. Analyses of bilateral asymmetry in the occurrence of eyeflukes in left and right eyes of infected fish demonstrate that Tylodelphys sp. shows significant asymmetry in non-ligulosed roach, which is not replicated in ligulosed individuals. In contrast, Diplostomum sp. shows no evidence of asymmetry in either ligulosed or non-ligulosed fish.

The linear growth of roach infected with Ligula Intestinalis plerocercoids in the Chivyrkuysky Bay of the lake Baikal

2016 ◽  
Vol 3 (3) ◽  
pp. 312-318
Author(s):  
Дугаров ◽  
Zh. Dugarov ◽  
Ринчинов ◽  
Z. Rinchinov
Keyword(s):  
Body Length ◽  
Lake Baikal ◽  
Linear Growth ◽  
Age Groups ◽  
Rutilus Rutilus ◽  
Time Interval ◽  
Age Classes ◽  
Infection Level ◽  
Roach Rutilus Rutilus ◽  
Ligula Intestinalis

Objective of research: The purpose of the study is to investigate the influence of Ligula intestinalis plerocercoids on linear growth of roach Rutilus rutilus in the Chivyrkuysky bay of the lake Baikal. Materials and methods. Roach was caught on a permanent station in the Monakhovo creek of Chivyrkuysky bay of the lake Baikal at the same time interval (June 25-July 5) in 1997-2005. The analysis of roach infection with L. intestinalis plerocercoids was performed based on incomplete parasitological dissections of 807 host specimens at the age of 0+ to 10+. Standard body length (the distance from the tip of the snout to the anterior end of the caudal fin) was used to characterize the linear growth of roach. Results and discussion. L. intestinalis plerocercoids wasn’t found out in underyearlings (0+) of roach. The host began to be infected with this tapeworm at the age of 1+. The maximum infection level with L. intestinalis plerocercoids was observed in roach at the age of 3+. That one was significantly reduced in the age of 4+. The infection level of roach with L. intestinalis continued to decrease in the next age groups, going down to a minimum at the age of 7+. The roach wasn’t infected with this tapeworm at the age of 8+–10+. A significant reduction of the infection level in the roach in the age classes 4+ and older after the maximum at the age of 3+ was probably associated with parasite-induced mortality of the host during the growth of the age group 3+ to 4+. A standard body length of roach specimens infected with L. intestinalis at the age of 1+ and 2+ was greater than that of uninfected ones. In contrast, the standard body length of the roach specimens infected with this tapeworm was less than that of uninfected ones in subsequent age classes (3 + -6 +). Differences of standard body length between roach specimens infected with L. intestinalis and uninfected ones were statistically significant in the above-mentioned age groups (1 + 6 +). The effect of L. intestinalis plerocercoids on the linear growth of the roach in Chivyrkuysky Bay of the lake Baikal was manifested in an increase of body length of infected host specimens compared to uninfected ones in young age groups (1+ and 2+) and, vice versa, in one’s decrease in age groups 3+–6 +. We proposed to call this effect “reversive”.

Experimental demonstration of a behavioural modification in a cyprinid fish, Rutilus rutilus (L.), induced by a parasite, Ligula intestinalis (L.)

2002 ◽  
Vol 80 (4) ◽  
pp. 738-744 ◽  
Author(s):  
Géraldine Loot ◽  
Stéphane Aulagnier ◽  
Sovan Lek ◽  
Frédéric Thomas ◽  
Jean-François Guégan
Keyword(s):  
Rutilus Rutilus ◽  
Infected Fish ◽  
Experimental Demonstration ◽  
Roach Rutilus Rutilus ◽  
Ligula Intestinalis ◽  
Behavioural Changes ◽  
Proximate Mechanisms ◽  
Behavioural Modification ◽  
Avian Predators ◽  
The Vertical Distribution

Behavioural changes in parasitized hosts have been experimentally investigated by comparing the swimming behaviour of roach, Rutilus rutilus, infected by the tapeworm Ligula intestinalis with that of uninfected roach when they were exposed to the same overhead heron stimulus. Before the stimulus was presented, infected fish swam close to the surface and uninfected fish were preferentially found near the bottom of the tank. The stimulus clearly induced a change in the vertical distribution of infected fish only. On the other hand, infected roach were less active than un infected fish before, during, and after the stimulus was presented. Proximate mechanisms of these behavioural changes are discussed. These behavioural differences, i.e., roach surfacing, swimming, and response to stimulus, probably favour the predation of infected roach by avian predators.

Behaviour of roach (Rutilus rutilus L.) altered by Ligula intestinalis (Cestoda: Pseudophyllidea): a field demonstration

2001 ◽  
Vol 46 (9) ◽  
pp. 1219-1227 ◽  
Author(s):  
Géraldine Loot ◽  
Sébastien Brosse ◽  
Sovan Lek ◽  
Jean-François Guégan
Keyword(s):  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Ligula Intestinalis
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