Vasil Kostov

Vasil Kostov
Ss. Cyril and Methodius University - Institute of Animal Science · Fishery Department

PhD, University Professor

About

105
Publications
22,799
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483
Citations
Additional affiliations
March 2010 - March 2016
Ss. Cyril and Methodius University in Skopje
Position
  • GENERAL MANAGER OF INSTITUTE OF ANIMAL SCIENCE SKOPJE

Publications

Publications (105)
Article
Background and purpose: Pigmented macrophage aggregates (PMAs) are a part of the immune system of fish and are considered as valuable biomarkers of the impact of water pollution on fish health.Materials and methods: Immunomodulatory effect of water contaminated with high levels of metals on spleen and splenic PMAs of Vardar chub (Squalius vardarens...
Article
Full-text available
The Prespa trout is a known mountain resident to four tributaries of Prespa Lake in a small area of the Prespa region. Facing threat of extinction, the endemic Prespa trout was categorized as an endangered species. The goal of this paper is to provide information on the condition factor and the L-W relationship with non-lethal research techniques....
Article
Full-text available
The threat posed by invasive non-native species worldwide requires a global approach to identify which introduced species are likely to pose an elevated risk of impact to native species and ecosystems. To inform policy, stakeholders and management decisions on global threats to aquatic ecosystems, 195 assessors representing 120 risk assessment area...
Article
Full-text available
The validity of four gudgeon species known for the ichthyofauna of North Macedonia has been a matter of different taxonomic disputes (except for Gobio ohridanus Karaman, 1924). Recently, a restoration of the species status was proposed for Gobio balcanicus Dimovski et Grupče, 1977 and Romanogobio banarescui (Dimovski et Grupče, 1974). So far, Roman...
Article
Environmental changes due to non-native species introductions and translocations are a global concern. Whilst understanding the causes of bioinvasions is important, there is need for decision-support tools that facilitate effective communication of the potential risks of invasive non-native species to stakeholders. Decision-support tools have been...
Article
Environmental changes due to non-native species introductions and translocations are a global concern. Whilst understanding the causes of bioinvasions is important, there is need for decision-support tools that facilitate effective communication of the potential risks of invasive non-native species to stakeholders. Decision-support tools have been...
Article
Pigmented macrophage aggregates (MAs) are known to change under influence of various factors, such as aging, season, starvation, and/or pollution. In this study, changes in the pigment content of the MAs in the spleen of Vardar chub (Squalius vardarensis, Karaman) (n = 129) collected in spring and autumn, from three rivers with different pollution...
Chapter
The catchment of the Danube River in the Republic of Macedonia consists of the source waters of the Binačka Morava, a tributary of the Južna Morava that represents the shorter headwater of the Velika Morava, which flows into the Danube near Smederevo.
Article
Full-text available
Metals play crucial physiological roles, but they can also cause irreparable toxic effects through binding to important cellular biomolecules in aquatic organisms. The aim of this study was to determine the exact molecular masses and to identify several selected metal-binding biomolecules in hepatic and gill cytosols of Vardar chub (Squalius vardar...
Article
Freshwater contamination with mining waste can result with high concentrations of toxic metals in the water and in fish organs. In North- Eastern Macedonia, several rivers (e.g., Zletovska, Kriva) are exposed to acid mine drainage from active Pb/Zn mines. Previous studies confirmed high concentrations of dissolved metals in their water. This study...
Conference Paper
Presence, number, position, and shape of postcranial skeleton have a diagnostic value, even for closely related species. In this study, beside the number of vertebrae in different subunits of the spinal column in four gudgeon species form R. Macedonia, a difference was noticed in the morphology of other elemetns of the postcranial skeleton. The arc...
Conference Paper
Osteological characters are considered as important diagnostic traits for inferring phylogenetic relationships within Cyprinidae. In this study for the first time is provided a detail description of the osteological features of four gudgeon taxa from R. Macedonia. Based on the results, os kinethmoideum, os mesethmoideum, os orbitosphenoideum, os ba...
Presentation
Full-text available
Abstract - Osteological characters are considered as important diagnostic traits for inferring phylogenetic relationships within Cyprinidae. In this study for the first time is provided a detail description of the osteological features of four gudgeon taxa from R. Macedonia. Based on the results, os kinethmoideum, os mesethmoideum, os orbitosphenoi...
Article
Full-text available
The aim of this study was to investigate the influence of the biomanipulation on the living communities and water quality in the Strezhevo hydroecosystem, Republic of Macedonia in which a problem with increase of primary organic production has occurred. The biomanipulatory intervention in water bodies is used to prevent the development of macrophyt...
Article
Many bioindicators have not yet been well characterized regarding their tendency to bind trace elements by different cytosolic biomolecules in response to trace element exposure. Accordingly, our principal aim was to define the cytosolic distributions of Cd, Co, Cu, Fe, Mn, Mo, Se, and Zn among the biomolecules of different molecular masses in live...
Article
Full-text available
Ecotoxicological examinations based on seven heavy metals (Fe, Cu, Zn, Mn, Cd, Pb and Cr) concentrations in organs of gudgeon (Gobio gobio L.) caught by 14 monitoring points at Vardar River in Republic of Macedonia were performed. The organ’s samples elements were read-out on AAS in flame and graphite cuvette. Significant increase of Pb and Cd cont...
Article
Full-text available
Fish introductions, particularly in areas of high biological diversity and endemism, represent a major threat for biodiversity. In the Balkan Peninsula, 60 fish species have been introduced to date, of which 36 have become naturalised in inland waters. Since the Balkans are one of the world’s 35 biodiversity hotspots, this large presence of alien f...
Article
Full-text available
Lipid peroxidation product, malondialdehyde (MDA), was studied in Vardar chub(Squalius vardarensis Karaman) as indicator of oxidative stress, using native fish from three rivers in northern Macedonia: mining impacted Zletovska and Kriva rivers, and agriculturally impacted Bregalnica River. MDA concentrations were measured in the intestine in spring...
Article
Full-text available
After a detailed observation of the external morphological features, osteology architecture, it was concluded that analysed individuals had all the distinguishing features of the species A. melas. The presence of different size class permitted the supposition that the black bullhead has established a self-sustaining population in this river. Црното...
Article
Full-text available
Changes in fish macrophage aggregate centres (MACs) are a useful indicator of environmental stress. In this study we evaluated stereologically the values of these cells in the polluted sites compared to the clean site in the River Bregalnica. MACs aggregates were randomly distributed in spleen and often showed irregular form. Dominant pig-ment in t...
Article
Full-text available
The catalogue summarizes the data found in the collection of freshwater decapods of the Macedonian Museum of Natural History in Skopje, Republic of Macedonia. In the present work we have also critically reviewed the historical data on the occurrence and distribution of representatives of decapods present in the country. The popula-tions of decapods...
Article
Full-text available
Integrated chemical and biomarker approaches were performed to estimate if there is ongoing toxicity in the River Bregalnica, namely connected with the presence of metals. The study was performed in water, sediment, and barbel (Barbus peloponnesius), collected in two seasons, from two suspected polluted and one reference zones. The water analyses r...
Article
Pollution with heavy metals may influence the immune system of fish, leading to impairment of their health or even increase their mortality. The fish kidney is one of the first fish organs to be affected by water contamination. Amounts of kidney macrophages (MACs), which are involved in fish immune response, as well as the qualitative and quantitat...
Article
Full-text available
To evaluate whether molecular data support the distinctiveness of Salmo macedonicus (Karaman, 1924) and Salmo pelagonicus Karaman, 1938, and to examine a possible impact of non-native trout translocated from the Drim drainage on the indigenous trout of the Vardar drainage, 187 individuals from 15 populations sampled across both drainages were studi...
Conference Paper
Gobio and Romanogobio are the only native European freshwater cyprinid genera of the subfamily Gobioninae. They comprise a morphologically and ecologically diverse group of fishes, being a subject of many taxonomic studies. In the past in R. Macedonia four subspecies have been established (G. gobio ohridanus, G. gobio balcanicus, G. uranoscopus sta...
Presentation
Full-text available
Abstract - Gobio and Romanogobio are the only native European freshwater cyprinid genera of the subfamily Gobioninae. They comprise a morphologically and ecologically diverse group of fishes, being a subject of many taxonomic studies. In the past in R. Macedonia four subspecies have been established (G. gobio ohridanus, G. gobio balcanicus, G. uran...
Article
Full-text available
The effect of diets rich with DHA (docosahexaenoic acid) on egg production, the influence on egg structural components and DHA deposition in egg yolk were investigated on Hisex Brown laying hens. The experimental groups were fed with diets rich with 792 mg DHA kg-1 and 1180 mg DHA kg-1. The control group received commercial diets with no content of...
Article
Full-text available
There are so many reports of introduction of non-native fish species in Europe but reports including introduction of species from Serrasalmidae, especially from piranhas fish are scarce. This paper documents the first record of the occurrence of the exotic red bellied piranha, in Dojran Lake, the southern part of Republic of Macedonia. The morpholo...
Article
Full-text available
Isoflavones are phytoestrogens which have estrogen-like activity in animals and humans with structure similar to 17-β-estradiol and capable of binding to estrogen receptors (ERs).This experiment was conducted to demonstrate the effect of isoflavones on estradiol concentration in blood and its influence on the produc-tive performances in ISA Brown l...
Article
Full-text available
Preparation of the River Basin Management Plans (RBMP) requires postulation and implementation of at least a one year surveillance monitoring of the selected water bodies in the catchment. The monitoring should be as comprehensive as possible, focused on detection of reference conditions and should reveal the water bodies' ecological status and the...
Article
Full-text available
Nutritional manipulation and genetic selection for egg size and production may lead to changes in egg components. This experiment was carried out to analyse the egg structure parameters of eggs produced by Hisex Brown laying hens fed with a diet including different supplements. The intensity of egg production was significantly higher in the groups...
Article
Many natural freshwater ecosystems, especially in the north eastern Macedonia, are polluted with heavy metals, which are released by active mines. Long-term exposure to high levels of dissolved metals might result in increased metal bioaccumulation in organs of aquatic organisms, and consequently might cause various sub-toxic and toxic effects. The...
Article
Full-text available
Preparation of the River Basin Management Plans (RBMP) requires postulation and implementation of at least a one year surveillance monitoring of the selected water bodies in the catchment. The monitoring should be as comprehensive as possible, focused on detection of reference conditions and should reveal the water bodies' ecological status and the...
Article
Macrophages are involved in innate and acquired immune responses, being key players in immunotoxicology. Changes in the quantities of pigmented macrophage aggregates (PMQ) in fish are often used as biomarkers of pollution. Most studies offer only qualitative data on PMQ changes, and effects of age, sex and season are poorly known. We present a ster...
Article
Full-text available
The catalogue summarizes the data found in the collection of freshwater decapods of the Macedonian Museum of Natural History in Skopje, Republic of Macedonia. In the present work we have also critically reviewed the historical data on the occurrence and distribution of representatives of decapods present in the country. The populations of decapods...
Article
Full-text available
This is the first record of the common bream, Abramis brama (Linnaeus, 1758), introduced into the Tikvesh Reservoir, Crna Reka river, as a part of the Vardar river basin in the Republic of Macedonia. Twenty-two specimens of this cyprinid fish species were captured in the Tikvesh Reservoir on October 2014. Two of them were immediately frozen for fu...
Article
Quantification of histopathological alterations in the gills of Vardar chub (Squalius vardarensis Karaman) was performed in 2012 in rivers of north-eastern Macedonia, with the aim to examine the effects of water quality in the rivers (Zletovska and Kriva River - impacted by active Pb/Zn mines ; Bregalnica River - contaminated by agricultural waste)...
Article
Full-text available
The aims of this study were to determine the influence of the factors affecting fin damage under different rainbow trout production systems and to compare the findings with the known experimental reports. The study was based on a questionnaire that included information about the main factors i.e. oxygen level in exit water, water temperature, stock...
Article
Full-text available
Recent field studies have shown that the survival of Zingel balcanicus (Karaman, 1937) was enabled in an isolated area along the Treska River. The presence of two opercular spines in Z. balcanicus, compared to only one in Zingel streber, has attracted our interest for investigating more details about osteological characters of Z. balcanicus in orde...
Data
Recent field studies have shown that the survival of Zingel balcanicus (Karaman, 1937) was enabled in an isolated area along the Treska River. The presence of two opercular spines in Z. balcanicus, compared to only one in Zingel streber, has attracted our interest for investigating more details about osteological characters of Z. balcanicus in orde...
Article
Full-text available
The objective of this study is to contribute to the optimization of monitoring activities of the Mantovo Reservoir (SouthEastern part of the Republic of Macedonia), to propose effective measures to reduce the pressures and improve the status of the reservoir. Development of an effective system of water bodies status assessment in accordance with th...
Conference Paper
Full-text available
Pollution of surface water presents the major ecological problem in developed industrial world. Various human activities lead to the deterioration of water quality and mining presents one of those impacts. This need for resources has been proven to have extremely negative influence on all biological as well as physico-chemical characteristics of wa...
Conference Paper
Full-text available
Anthropogenic activities increase discharge of different pollutants in the aquatic environment which cause deterioration of the environment. Mining activities release in the environment different inorganic species and metals, which has negative effects on the water quality, aquatic organisms and humans. Aquatic organisms are affected by metal conce...
Conference Paper
Full-text available
Contamination of surface waters is a world-wide environmental problem. Anthropogenic activities like industry and mining can increase metal concentrations in the surface waters and may result in significant deterioration of water quality. Microorganisms are commonly used as biological indicators of surface water conditions. Microorganisms respond r...
Conference Paper
Full-text available
Fish parasites with a complex life cycle, including intermediate and paratenic hosts, can be used as indicators of aquatic environmental stress. Their identification is however often difficult, due to the high level of intraspecific variability. The aim of the present study was to identify metazoan parasites found in Vardar chub (Squalius vardarens...
Conference Paper
Full-text available
In the past decades, the interrelation between parasites and contaminants has gained increasing interest, especially in aquatic ecotoxicology. Fish intestinal parasites, acanthocephalans, were reported to effectively accumulate metals in concentrations that are orders of magnitude higher than those in the commonly used indicator organisms like fish...
Conference Paper
Full-text available
Mining activity can seriously affect the quality of surface water, especially regarding the levels of trace elements, which present a serious threat to the aquatic organisms because of their toxicity, persistence and bioaccumulation. The aim of this study was to assess bioavailability of metals and metalloids in the river water based on their accum...
Conference Paper
Full-text available
The natural environment of many river ecosystems, especially in the north eastern part of Macedonia, is more and more polluted with heavy metals, most of which were released into the environment by the active mines in this region. It could be presumed with high certainty that long-term exposure to high levels of dissolved metals will result in incr...
Conference Paper
Full-text available
Fish are frequently selected as the organisms of choice in aquatic biomonitoring due to their top position in the biotic communities and their sensitivity to low concentrations of environmental pollutants. Among other pollutants, metals represent a serious threat to the aquatic environment, since they are not biodegradable and can accumulate in the...
Conference Paper
Full-text available
Metallothionein (MT) and total cytosolic protein (TP) concentrations were determined as biomarkers of water contamination in gill and hepatic cytosols of Vardar chub (Squalius vardarensis) caught in three rivers in north-eastern Macedonia, one agriculturally impacted (Bregalnica) and two mining impacted (Zletovska and Kriva), in spring (May/June) o...
Conference Paper
Full-text available
Histopathological alterations on the gills of Vardar chub (Squalius vardarensis) were studied in three rivers in Pb/Zn mining region in north-eastern Macedonia. The Zletovska and Kriva River are directly impacted by active Pb/Zn mines Zletovo and Toranica, respectively, whereas the Bregalnica River is moderately contaminated mainly by agricultural...
Conference Paper
Full-text available
The mine waste was recognized as one of the most serious threats for freshwater ecosystems, and it still represents one of the biggest environmental concerns in Macedonia. Some of the reasons for its toxicity are the acidity and high content of trace metals, which could lead to significant loss of biodiversity. Macedonian most significant mineral d...
Conference Paper
Full-text available
Disturbed natural balance as a result of significant pollution pressure by mining activities has been already reported for the major waterways in the Republic of Macedonia. An exceeded metal concentration in the aquatic environment has the potential to induce serious harm in wild organisms, to impair their health, condition, reproduction or their h...
Article
Full-text available
This paper analysed a total of 76 fish individuals collected at four different localities in Republic of Macedonia. The following were encompassed: River Strumica, River Vardar and two natural lakes-Ohrid Lake and Prespa Lake. The samples affiliated with the four previously mentioned barbel species on the territory of Republic of Macedonia: Barbus...
Article
Full-text available
Mine waste is recognized as being one of the most serious threats for freshwater ecosystems, and it still represents one of the greatest environmental concerns in Macedonia. The aim of our investigation was to obtain an in-depth understanding of mining influence on freshwater systems from water contamination to effects on aquatic organisms. In this...