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Evgeny I. Izvekov

Evgeny I. Izvekov
I.D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences · Laboratory of Fish Ecology

PhD

About

35
Publications
9,799
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246
Citations
Citations since 2016
14 Research Items
166 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530

Publications

Publications (35)
Article
Full-text available
In the 1960s, it was hypothesized that slow magnetic fluctuations could be a secondary zeitgeber for biological circadian rhythms. However, no comprehensive experimental research has been carried out to test the entrainment of free-running circadian rhythms by this zeitgeber. We studied the circadian patterns of the locomotor activity of zebrafish...
Article
Currently, little is known about inhibitory substances enabling tapeworms to settle in fish intestines thereby avoiding proteolysis. Contrary to previous studies with certain host–parasite pairs, this research compares the inhibitory capacities in three tapeworm species of the same genus Proteocephalus from four different fishes (P. torulosus from...
Article
Full-text available
The locomotor activity of zebrafish (Danio rerio) has a pronounced, well-studied circadian rhythm. Under constant illumination, the period of free-running locomotor activity in this species usually becomes less than 24 hours. To evaluate the entraining capabilities of slow magnetic variations, zebrafish locomotor activity was evaluated at constant...
Preprint
The locomotor activity of zebrafish (Danio rerio) has a pronounced, well-studied circadian rhythm. Under constant illumination, the period of free-running locomotor activity in this species usually becomes less than 24 hours. To evaluate the entraining capabilities of slow magnetic variations, zebrafish locomotor activity was evaluated at constant...
Article
The mechanisms enabling fish tapeworms to avoid proteolytic attacks by digestive enzymes of their fish host have been studied in less detail compared with mammalian cestodes. This study aimed to assess the inhibitory ability towards trypsin and chymotrypsin in Eubothrium rugosum, an intestinal parasite of burbot Lota lota, and establish its localiz...
Article
Over recent decades, changes in zebrafish (Danio rerio) behaviour have become popular quantitative indicators in biomedical studies. The circadian rhythms of behavioural processes in zebrafish are known to enable effective utilization of energy and resources, therefore attracting interest in zebrafish as a research model. This review covers a varie...
Article
ABSTRACT Adaptive mechanisms underlying the long-term existence of intestinal parasites in their enzymatically hostile environment are still poorly understood, particularly with regard to fish cestodes. The study describes the activity distribution of proteolytic enzymes along the gut of the bream Abramis brama infected with intestinal cestodes Car...
Article
The extract of the fish tapeworm Eubothrium rugosum was found to inhibit activity of intestinal proteases in its host, the burbot. A decrease in proteolytic activity of the intestinal mucosa, when using the E. rugosum extract as an inhibitor, is comparable with that of a serine protease inhibitor PMSF. This implies that the tapeworm-produced inhibi...
Article
Full-text available
Laterality of brain and behavior at the individual and/or group level is a characteristic of all vertebrate classes, including amphibians. It is well recognized that the right-eye/left-hemisphere system is more efficient in discrimination of edible and non-edible items. However, the ontogenesis of this or other lateralized responses has rarely been...
Article
Laterality of brain and behavior at the individual and/or group level is a characteristic of all vertebrate classes. The general pattern of left-right asymmetry in vertebrates is so that left-eye/right-hemisphere system is used to detect socially important images, like conspecifics, and also recognize danger, while the right-eye/left-hemisphere sys...
Article
Full-text available
Parasitic organisms inhabiting the alimentary canal should permanently resist the destructive action of host digestive enzymes. The intestinal parasites were shown to produce specific protease inhibitors protecting them from proteolysis. However, little is known about this adaptive mechanism in cestodes so far, especially for the tapeworms dwelling...
Article
Full-text available
The proteolytic activity in washings off the Triaenophorus nodulosus cestode tegument and the ability of the worms to inactivate proteolytic enzymes were studied. It was found that the major proteolytic activity in the washing samples is represented by the easily desorbed fraction most probably characterizing the activity of the host’s enzymes. Ser...
Research
Full-text available
The activities of major digestive hydro-lases (proteases, amylase, lipase and esterases) along the intestine were studied in the burbot Lota lota (L.) using different methods of activity expression. The enzyme activities were determined both in the whole gut segments and in the isolated mucosa, and then expressed in terms of tissue mass and protein...
Article
Full-text available
In the review, contemporary data on the influence of natural and artificial magnetic fields on fish behavior are considered. In this regard, elasmobranchs and teleosts appear to be studied most exhaustively. Elasmobranchs and some teleosts are able to perceive magnetic fields via electroreceptors. A number of teleosts can sense magnetic fields via...
Article
Full-text available
Embryos of the zebrafish Danio rerio were exposed for 24 h to a simulated geomagnetic storm. Fish that developed from these embryos came out of the starting enclosure into the aquarium sooner than those reared in the normal geomagnetic field. On the other hand, the two groups displayed no considerable differ� ence in general locomotor activity. We...
Article
Full-text available
The available data on the effect of natural and artificial magnetic fields on fish behavior are con�sidered. In this aspect, Elasmobranchii and Teleostei are studied more thoroughly. Elasmobranches and some teleosts are able to perceive magnetic fields via electroreceptors. Some teleosts can sense magnetic fields via sensory cells that contain crys...
Article
Unfortunately, in enzymes and activity distribution in Table 6, some lines were mismatched in the original publication. The corrected enzymes and activity distribution should read as given in Table 6 of the erratum.
Article
Full-text available
The young roach Rutilus rutilus (L.) (Cyprinidae) displays lateralized behavior when facing a barrier through which a simulated bigger fish was visible. The asymmetry consists in a significant tendency to detour a barrier rightwards in the presence of a dummy fish. However, asymmetry is insignificant without the model. A comparison with the availab...
Article
Full-text available
In the review, contemporary data on the influence of natural and artificial magnetic fields on fish behavior are considered. In this regard, elasmobranchs and teleosts appear to be studied most exhaustively. Elasmobranchs and some teleosts are able to perceive magnetic fields via electroreceptors. A number of teleosts can sense magnetic fields via...
Article
Full-text available
For the first time, behavioural lateralisation was shown in a chondrostean fish (sterlet sturgeon Acipenser ruthenus). A significant directional bias was found in young A. ruthenus swimming along a circular swimway. This laterality manifested itself as an individual preference for a certain movement direction (either clockwise or counterclockwise)...
Article
Full-text available
The activities of major digestive hydrolases (proteases, amylase, lipase and esterases) along the intestine were studied in the burbot Lota lota (L.) using different methods of activity expression. The enzyme activities were determined both in the whole gut segments and in the isolated mucosa, and then expressed in terms of tissue mass and protein...
Chapter
Full-text available
The influence of trematode and cestode infections on the glycogen content in the muscles and liver of various fish species was studied. The glycogen content was found to increase in the muscles of young cyprinid fishes (ide Leuciscus idus, dace Leuciscus leuciscus, goldfish Carassius auratus, and roach Rutilus rutilus) following the experimental in...
Article
Full-text available
In humans, hemispheric language dominance is, to some degree, associated with handedness. Significant associations have been reported between several other lateralized functions. Much less is known about the organization of cerebral asymmetries in nonhuman species and, in particular, whether the presence of reversed asymmetry of one function is ass...
Article
Full-text available
The asymmetry in selecting the direction of movement, i.e., the preference to swim clockwise or counterclockwise, was found in yearling roaches Rutilus rutilus (Cyprinidae) placed into a ring-shaped tank under infrared light. A positive correlation was revealed between the behavioral laterality and asymmetry of the surface area of paired frontal bo...
Article
Full-text available
The activities of the main digestive hydrolases were comparatively studied in bream infected and noninfected with cestodes Caryophyllaeus laticeps (Pallas, 1781). It was shown that enzyme activities are distributed in the fish intestine in an irregular manner; the gradient of protease and lipase activities along the gut is presented. Following the...
Article
Full-text available
In the higher vertebrates, asymmetries of different functions of individual are poorly connected with each other. At present it is unknown whether this poor link is a secondary phenomenon or it is characteristic of different kinds of functional asymmetry already at early stages of vertebrate evolution. In connection with this problem, in the roach...
Article
Full-text available
The underyearlings of roach, Rutilus rutilus, displayed a bilateral asymmetry of C-bend—the initial stage of escape behavior. Most individuals exhibited a significant bias to turn leftward or rightward after being stimulated by electrical current. This individual asymmetry was consistent when the same fish were retested ten days later. A significan...
Article
Full-text available
The bilateral asymmetry of C-turn - the initial stage of escape behavior - was revealed in the roach, Rutilus rutilus. Under the action of electric stimulus, the individuals bent to different sides. Such an asymmetry was related to the bilateral asymmetry of morphological characteristics: the significant negative correlation was found with the asym...
Article
The initial stage of the escape response (C-bend of the body) upon sudden impact of electric current on free-swimming fish was studied in young roach (Rutilus rutilus). More than half of the fish showed distinct behavioral laterality. i.e., a stabile tendency to bend either to the left or to the right, and retained it until the next test conducted...
Article
Full-text available
Published data on the taxonomic composition of the intestinal bacterial flora in fishes living under different conditions (marine and freshwater fishes) and differing in the type of feeding are reviewed. The results confirm the conclusion that the composition of intestinal microflora differs depending on fish ecology. A limited number of bacterial...
Article
Full-text available
Current data on the relation of locomotory responses laterality to taxonomy and mode of life in fish, as well as to asymmetry of CNS, sensory, and somatic organs, are examined. Although the correlations of behavioral laterality with some of the abovementioned features are already found, the causes inducing lateralities of many fish responses remain...
Article
Full-text available
Factors causing variability of behavioral laterality in Teleostei are reviewed. The laterality has been revealed in many fish species belonging to various families. The best ever demonstrated example of the laterality is the different use of the right and left eyes when a fish responds to different visual objects. Magnitude and sign of the laterali...
Article
Full-text available
Описание и критический анализ наиболее распространенных, а также новых методов определения оптимальных температур, условно разделенных на две группы - этологические и физиологические. К первой группе относятся методы, основанные на использовании поведенческих реакций, ко второй группе - методы, в которых для тестирования применяются различные проце...

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Projects

Projects (2)
Project
to study changes in Danio rerio behavioral characteristics in response to various combinations of magnetic fields and lighting modes
Project
the study involves amphibians and most primitive living osseous fish and aims to answer the question which kind of behavioural lateralization is the most aincient in vertebrates