Institute of Animal Science
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Item type:Publication, Genetic structure and distribution of oxynoemacheilus bureschi (balitoridae, teleostei), and its phylogenetic relationships with other European stone loaches(2008)Šedivá, Alena, Apostolou Apostolos, Janko Karel, Kohout, Jan, Kostov Vasil, Sanda RadekThe genetic differentiation of Oxynoemacheilus bureschi (Drensky, 1928) from all three drainages (Struma=Strymon, Mesta=Nestos, Vardar=Axios) where this species occurs, as well as its phylogenetic relationships with other European stone loaches, was assessed using the mitochondrial cytochrome b gene. The phylogenetic reconstruction revealed two distinct clades within the European stone loaches with high bootstrap values. Very low genetic variability with no internal haplotypic structure has been found between and within all examined O. bureschi populations, indicated by low polymorphism and similar haplotypes. According to the nesting design and demographic patterns, the range of O. bureschi was not constant, but underwent expansion in the recent past. Lack of variation, a rather unusual phenomenon for fishes from the southern Balkans, is ascribed to facilitation of dispersal due to seashore regression, confluence events and river capture during the Pleistocene. - Some of the metrics are blocked by yourconsent settings
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 isoflavones in feed on plasma estradiol concentration and productive performances in laying hens(2016)Gjorgovska Natasha, Filev Kiril, Levkov Vesna, Kostov Vasil, Nastova RodneIsoflavones 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 productive performances in ISA Brown laying hens fed with supplemented feed with large amount of isoflavones. Isoflavones as non steroid phytoestrogens were added in large amounts to the feed of laying hens in 0, 1000, 2000 and 3000 mg kg-1 of feed. Estradiol concentration in blood of the isoflavone-treated chickens was significantly higher in comparison with the control group (P < 0.01). The supplemented isoflavones in the feed have significant improvement on the egg weight during the 1st month (P < 0.05) and 2nd month (P < 0.01) and also for the whole experimental period (P < 0.05). Further studies are required to investigate the effect of isoflavones on other reproductive hormones (follicle stimulating hormone (FSH) and progesterone) which are related with the egg production. © 2010 by Islamic Azad Univerty, Rasht Branch, Rasht, Iran. - 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, 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, The effect of feed rich in DHA on egg production, egg components and DHA content in yolk(Bulgarian Journal of Agricultural Science, 2016)Gjorgovska Natasha Filev K.,Levkov V. Gjorgjievski S., Kostov VasilThe 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 DHA. Throughout the experiment there were no statistically significant differences in live weight of laying hens (g) and feed conversion ratio (FCR:g) between control and experimental groups (P>0.05). The structural components of eggs (egg weight, white weight, yolk weight and shell weight) were also not statistically significant (P>0.05), but only the egg yolk:white ratio was statistically different (P<0.01). The concentration of DHA in 100 g yolk was 818 mg and 974 mg in group 2 and 3, respectively. The transfer of DHA was significantly higher in the experimental groups fed with supplemented diet with higher amount of DHA (P<0.01). © 2016, National Centre for Agrarian Sciences. All rights reserved. - 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