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”.

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.

scholarly journals Using osteological measurements to estimate body length in Amazonian manatees

2021 ◽  
Vol 51 (2) ◽  
pp. 156-161
Author(s):  
Gisele de Castro Maciel VALDEVINO ◽  
Vera Maria Ferreira DA SILVA ◽  
Rodrigo de Souza AMARAL
Keyword(s):  
Body Length ◽  
Management Strategies ◽  
Age Groups ◽  
The Body ◽  
Simple Linear Regression ◽  
Age Classes ◽  
Linear Measurements ◽  
Behavioral Studies ◽  
Condylobasal Length

ABSTRACT Body length is an important parameter in morphological, ecological and behavioral studies of a species and contributes to the understanding of the body condition of individuals. This parameter is essential for conservation and management strategies by informing studies evaluating growth rates, physical maturity and classification of individuals into age groups, promoting better accuracy for the biological parameters of the species. The aim of this study was to identify predictors of body length for Amazonian manatees (Trichechus inunguis) using metric characters of osteological materials. Eleven linear measurements of skull, jaw, scapulae and humeri were collected from 41 Amazonian manatee skeletons of different age classes (calf, juvenile and adult). Data were analyzed by simple linear regression. The condylobasal length was the best predictor of body length for the species (R = 0.943), however, all bones evaluated showed at least one measurement with the capacity to predict body size (R2 > 0.9). Results of this study are useful for inferring body length of Amazonian manatees using bones deposited in museums and biological collections, expanding the informative potential of these materials.

Optimizing Sampling from Trawl Catches: Contemporaneous Multistage Sampling for Age and Length structures

1992 ◽  
Vol 49 (8) ◽  
pp. 1555-1559 ◽  
Author(s):  
Jukka Horppila ◽  
Heikki Peltonen
Keyword(s):  
Optimal Strategy ◽  
Age Groups ◽  
Sampling Strategy ◽  
Rutilus Rutilus ◽  
Optimal Number ◽  
Optimal Sampling ◽  
Roach Rutilus Rutilus ◽  
Present Scheme ◽  
Multistage Sampling ◽  
Trawl Catches

The objective of this study was to find out the optimal sampling strategy for contemporaneous multistage sampling of age and length structures of trawl catches. Samples were taken from a roach (Rutilus rutilus) stock of Lake Vesijärvi, southern Finland. Two-stage sampling proved to be superior to three-stage sampling (i.e. subsamples from the trawl catches are unnecessary). Assuming that all the age and length groups are equally important, the optimal strategy is to sample 34 fish from each of 46 loads. Compared with the present scheme (500 fish from each of 10 loads), this design cuts down the total variance of the estimated proportions of different age and length groups to about one third. An age–length key was used when estimating the proportions of the age groups. The benefits of the applied age–length key were obvious. The estimates of the proportions of different age groups were more accurate than those obtained with age readings only. Increasing the fraction of age-determined fish increases the costs, diminishes the optimal number of samples, and consequently increases the variance of the estimated proportions of different groups.

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.

Catches, age and growth of the roach Rutilus rutilus (Cyprinidae) in the Middle Ob river basin (within the Tomsk region)

2021 ◽  
pp. 31-40
Author(s):  
Elena Aleksandrovna Interesova ◽  
Alexander Alekseevich Rostovtsev
Keyword(s):  
Positive Relationship ◽  
Age Groups ◽  
Hydrological Regime ◽  
Rutilus Rutilus ◽  
Age And Growth ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Roach Rutilus Rutilus ◽  
Significant Positive Relationship ◽  
Tomsk Region

The data on the catch, age composition and growth of the roach Rutilus rutilus L. in commercial herd in the Middle Ob basin (in the Tomsk region) are presented. It is shown that the catches of the roach in the middle of the 20th century were 2098 tons per year. In the second half of the 1960s, they fell sharply by more than two times. It was caused by a decrease in the areas of effective spawning due to the reduction of runoff in the Ob during spring floods as a result of the regulation of the level regime by the dam of the Novosibirsk hydroelectric power station. After that, the catch of roach remained at about 1013 tons per year until the beginning of economic reforms in the country, when the catch of this species became unprofitable, as a result of which catches decreased to an average of 436 tons per year. Currently, the basis of commercial catches is made up of roach with a commercial length of 140 to 210 mm and a weight of 50 to 150 g at the age of 2+...5+. It is noted, compared with the 1970–1980s, there is a shift in the age series towards an increase in the value of older age groups, which may indicate underutilization of the stock of the roach. The statistically significant positive relationship between catches of roach and the average duration of flooding of the floodplain in the years of the occurrence of generations that form the basis of catches was revealed. Prolonged floods also provide better conditions for fish feeding (a statistically significant positive relationship between the mass of fish of the same age and the duration of flooding of the floodplain is shown). Thus, the hydrological regime in the spring has a decisive influence on the state of the stocks of roach in the Middle Ob.

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

Positioning Behaviour in Roach Shoals: The Role of Body Length and Nutritional State

Behaviour ◽  
1998 ◽  
Vol 135 (8) ◽  
pp. 1031-1039 ◽  
Author(s):  
Daniel Hoare ◽  
Paul Reeves ◽  
Jens Krause
Keyword(s):  
Body Length ◽  
Average Length ◽  
Rutilus Rutilus ◽  
Functional Explanation ◽  
Large Fish ◽  
Roach Rutilus Rutilus ◽  
Front Position ◽  
Leading Position ◽  
Food Particles

AbstractThis study investigated the positioning behaviour of individual fish in small shoals of 2 and 10 roach, Rutilus rutilus. In pairs consisting of one small and one large fish with an average length difference of 10 mm, no difference was observed in the number of initiations of shoal movement between small and large fish. However, once both fish were moving, large fish took up the front position more frequently than small ones. A subsequent experiment showed that body length was positively correlated with swimming speed which could explain the leading position of large fish. In a second experiment, using pairs of size-matched fish we found that in moving shoals fish which had been deprived of food for 7 days were more likely to take up front positions than well-fed conspecifics. No difference, however, was observed in the frequency of initiations of shoal movement. A final experiment with pairs and shoals of 10 fish showed that fish in the front position (and in the front half of the shoal for shoals of 10 fish) were much more likely to obtain food particles than fish in other shoal positions when resources were limited. This could provide a functional explanation for the occurrence of food-deprived fish in front positions. Our results suggest that the initiation of new swimming directions in stationary shoals does not follow the same principles as positioning behaviour in shoals that are already on the move.

Morphological, histological, and molecular aspects of Myxobolus zaikae n. sp., a parasite of the roach Rutilus rutilus, in Lake Baikal

2020 ◽  
Vol 142 ◽  
pp. 75-82
Author(s):  
MD Batueva
Keyword(s):  
Connective Tissue ◽  
Lake Baikal ◽  
Rutilus Rutilus ◽  
Lateral View ◽  
Cyprinid Fish ◽  
Spore Morphology ◽  
Frontal View ◽  
Roach Rutilus Rutilus ◽  
The Common ◽  
Molecular Aspects

A new myxobolid species, Myxobolus zaikae n. sp., was found in the connective tissue near the kidney and liver blood vessels of the common roach Rutilus rutilus, while fish myxosporean fauna were being investigated in Lake Baikal, Russia. The parasites were studied on the basis of spore morphology as well as with histological and molecular methods. Mature spores of M. zaikae n. sp. are round or ellipsoidal in the frontal view and lemon-shaped in the lateral view, measuring 11.37 ± 0.11 µm (10.2-14.0 µm) in length, 10.29 ± 0.10 µm (9.6-11.0 µm) in width, and 6.3 ± 0.08 µm (5.8-7.1 µm) in thickness (mean ± SD; n = 50). Polar capsules are equal and pyriform, measuring 4.5 ± 0.07 µm (3.4-5.2 µm) in length and 2.9 ± 0.03 µm (2.6-3.3 µm) in width. Polar capsules contained polar filaments coiled with 5 to 6 turns. Phylogenetic analysis showed that this newly described species clusters with other myxobolid species infecting the connective tissue of different organs from Palearctic cyprinid fish.

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