Institute of Animal Science
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Item type:Publication, Genetic diversity of sabanejewia balcanica (actinopterygii: Cobitidae) in the western balkans and comparison with other regions(Institute of Vertebrate Biology, Czech Academy of Sciences, 2011)Eva Marešová, Antun Delić, Vasil Kostov, Saša Marić, Jan Mendel, Radek ŠandaInter-population variability within Sabanejewia populations from the western Balkans, and their phylogenetic position in comparison to other European populations were investigated. Of 79 samples analysed, 51 unique haplotypes were identified. Network analysis divided thirteen populations from five river basins into two clusters: cluster I was composed of populations from the Vardar drainage and tributaries of the neighbouring River Morava (River Danube basin), while cluster II contained the River Timok (eastern Serbia) and all the River Sava populations. The only locality that housed haplotypes of both clusters was the River Kutinska reka in the upper Morava basin. When compared with the haplotypes reported in former studies, both clusters fell within the ‘Danubian-Balkanian complex’. Cluster II was included in the most heterogeneous sub-lineage S. montana – S. bulgarica – S. balcanica (III), while cluster I was related to the sub-lineages S. doiranica – S. balcanica (II) and S. balcanica (VI). Recently published haplotypes from the Croatian Sava (rivers Petrinjčica and Rijeka) and Drava (rivers Drava and Voćinska) basins, as well as Czech and Slovak individuals from the Danube and Tisza river basins were included. The River Drava showed the same population subdivision as the River Kutinska reka. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effects of water contamination with heavy metals on pigmented macrophages in spleen of Vardar chub (Squalius vardarensis Karaman) from three rivers in the North-Eastern region of North Macedonia(Hrvatski Prirodoslovno Drustvo (Croatian Society for Natural Sciences), 2022-07-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Splenic Pigmented Macrophage Aggregates in Barbel (Barbus peloponnesius, Valenciennes, 1844) from River Bregalnica — Influences of Age, Sex and Season on a Pollution Biomarker(Central Fisheries Research Institute (CFRI) Trabzon, Turkey in cooperation with Japan International Cooperation Agency (JICA), Japan, 2016)Maja Jordanova, Katerina Rebok, Marija Naskovska, Vasil Kostov, Eduardo RochaMacrophages 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 stereological study of the relative and total volumes of PMQ in the barbel, Barbus peloponnesius spleen. Our focus is to disclose influences of age, sex and season on PMQ, and check if the there is any positive association with aging. The females had a significantly higher spleen and body weights and length. PMQ loaded with lipofuscin/ceroid and hemosiderin were dispersed throughout both spleen pulps. Seasons impacted on PMQ, despite no too markedly. Differences existed between sexes, with males having significantly higher relative volumes of PMQ: the total volumes had similar tendencies. The volumes of PMQ were positively associated with age. The new data reinforce the importance of studying influences of both intrinsic and extrinsic factors that model the quantities of PMQ so to better interpret their changes seen in biomonitoring works - Some of the metrics are blocked by yourconsent settings
Item type:Publication, ASSEMENT OF THE ECOLOGICAL STATUS OF THE CRNA RIVER BASED ON THE FISH FAUNA – CONTRIBUTION TO THE ESTABLISHEMENT OF THE MONITORING SYSTEM OF RIVERS IN R. MACEDONIA(Institute of Animal and Fishery Sciences - Ss. Cyril and Methodius“ University in Skopje,, 2011)The purpose of this study is to assess the longitudinal variation of species composition and the community structure of ichthyofauna from the Crna River, as well as the assessment of the ecological status of the river based on the fish fauna. The investigation is made on 12 sampling points on the river during August, September and October 2006 including the reservoir Tikveš. Twenty nine species belonging to 9 families have been recorded. Among them 21 are autochthonous (native) species and 8 are allochthonous ones. The structure of fish community is evaluated by using structural indices of species richness – d, diversity H’, homogeneity – J(e) and similarity (S). Reduction of fish diversity could be noticed along the river course. It seems that changes in the habitat condition mainly associated with human activities are the main factors which alter the structure of fish community. EFI values indicate a healthy, natural or nearly natural water ecosystem or good ecological status along the river course from the source region to the sampling point T3. After the inflow of the River Blato, at the profile “Trojkrsti” (T4), the ecological status deterio- rates. The remaining downstream parts of the river has a moderate ecological status, except the profile below the town of Bitola, which according to the EFI has a bad ecological status. Below the “Skočivir” profile, the water qual- ity improves toward moderate status. The use of selected parameters of the community is found to be the effective ba- sis for further development of the system of the ecological status assessment based on the fish fauna. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Biological, Ecological and Taxonomic Characteristics of the Species Pelasgus minutus (Karaman, 1924) (Cypriniformes: Leuciscidae) from Belchishko Blato, Republic of North Macedonia(Acta Zool. Bulg, 2014-08)Vasil Kostov, Irina Manevska, Julijana Arsovska, Dijana Blazhekovikj-Dimovska, Stojmir Stojanovski & Lidija Velkova-JordanoskaPelasgus minutus is an endemic Macedonian ichthyofauna species inhabiting Lake Ohrid and its basin. It is an endemic species for the Balkan Peninsula and Europe. According to the European Red list, it is in the Data De- ficient (DD) category. In the Habitats Directive, it is placed in Annex II. Kottelat and Freyhof (2007) consider that the population of P.minutus in Lake Ohrid is probably extinct. The Belchisko Blato is its last refugium. This study aims to investigate the species’ main morphological, physiological, and ecological features due to a need for more information regarding its biological characteristics. A total of 71 individuals were analysed during the ichthyological research. Sixteen meristic counts are presented, and 41 morphometric measurements are performed with percentage relationships. The gender structure indicates a stable population. The percent- age representation is 4.2% juvenile, 43.7% male and 52.1% female individuals, with age range from 0+ to 3+. The majority of the population belongs to individuals aged 2+ (47%), and the rest are as follows: 1+ (28.2%), 3+ (19.7%) and 0+ (5.1%). Sexual maturity is reached during the second year of life (1+). The most minor sexually mature male and female individuals are aged 1+. Spawning occurs during the late winter months (February- March). The average absolute fecundity is 1549 eggs, ranging from 1144 to 1549. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Havy metals in organs of gidgeon (Gobio gobio L.) from Vardar River, R. Macedonia(Faculty od agriculture, Trakia University, Stara Zagora, 2017)Rodne Nastova, Vasil Kostov, Irina Ishlinovska - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Histopathology investigation on the Vardar chub (Squalius vardarensis) populations captured from the rivers impacted by mining activities(Elsevier Inc., 2016)Maja Jordanova a,n, Katerina Rebok, Zrinka Dragun, Sheriban Ramani, Lozenka Ivanova, Vasil Kostov, Damir Valic, Nesrete Krasnici, Vlatka Filipovic Marijic, Damir KapetanovicMany 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 aim of this study was to assess the health of Vardar chub (Squalius vardarensis) inhabiting mining impacted rivers Zletovska and Kriva, in comparison with chub from the re- ference Bregalnica River. It was done by use of indicators of tissue damage (histopathology of liver and go- nads) and general indicators of exposure to environmental stressors (condition factor, organo-somatic indices and external/internal macroscopic lesions). Histological assessment of gonads revealed good reproductive health in all three rivers, indicating high tolerance of gonads to contaminant exposure. Contrary, several external/internal lesions were more pronounced in chub from severely metal contaminated Zletovska River. Prevalence of hepatic lesions was also higher in mining impacted rivers (in Kriva, 70%; in Zletovska, 59%) compared to Bregalnica River (38%). The spectrum of histological lesions observed in chub liver varied from non-speci!c minor degenerative conditions, such as lymphocyte in!ltration, !brosis, parasites, granulomas and lipidosis, to extensive and/or more severe changes such as bile duct proliferation, necrosis, megalocytosis, light-dark hepatocytes and hepatocytes regeneration. The results of histopathological investigation for all three rivers showed clear signs of water contamination, especially prominent in mining in"uenced rivers. More research efforts should be devoted to study of environmental conditions and metal contamination in the mining impacted rivers worldwide, especially of their effects on health of local ichthyofauna. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, FACTORS AFFECTING FIN DAMAGE OF FARMED RAINBOW TROUT(Mac Vet Rev 2015; 38 (1): i-xi, 2015)Aleksandar Cvetkovikj, Miroslav Radeski, Dijana Blazhekovikj-Dimovska, Vasil Kostov, Vangjel StevanovskiThe 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, stocking density, daily feed ration, number of meals and grading frequency on seven rainbow trout farms. Standard multiple regression analysis, based on a previously published fin damage dataset, was used to assess the relationship between the level of fin damage per fin and the factors. Daily feed ration received the strongest weight in the model for the caudal, anal and both pectoral fins, whereas number of meals received the strongest weight in the model for both pelvic fins. Grading frequency received the strongest weight only in the dorsal fin model. Lower levels of daily feed ration and number of meals combined with higher water temperature increased the level of fin damage, whereas stocking density had no effect. The results conform to the experimental research on fin damage in rainbow trout. The research model contributes to the overall assessment of fish welfare and the regression analysis used in this study could be used on rainbow trout farms to evaluate the effect of the main factors on the level of fin damage. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of histopathological alterations in the gills of Vardar chub ( Squalius vardarensis Karaman) as an indicator of river pollution(Elsevier BV, 2015-08) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The influence of probiotic-enriched feed on Fulton’s coefficient and body mass of the common carp (Cyprinus carpio) reared in an intensive cage system(Hrvatsko Agronomsko Drustvo, 2025-06-30)