Institute of Animal Science

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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)
Ivanova, Lozenka
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Dragun, Zrinka
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Kostov, Vasil
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 vardarensis) (n=129) was examined in two seasons, spring, and autumn 2012. For this purpose, three rivers were chosen: the Zletovska River, heavily contaminated with metals, the Kriva River, moderately contaminated with metals combined with high level of organic matter, and the Bregalnica River, without heavy metal contamination. Spleen masses and splenosomatic indices (SSI) were used for determining the general impact of water contamination on the immune system of Vardar chub. Moreover, volumes and numbers of PMAs within spleen tissue were determined stereologically.Results: The isolated effect of high exposure to metals caused the reduction of spleen mass and/or SSI in the fish from the Zletovska River. The combined effect of exposure to metals and high levels of nutrients in the fish from the Kriva River referred to stimulation of PMAs response, namely increased volumes of splenic PMAs. The existence of seasonally dependent differences was noted since the observed variability in PMAs between rivers occurred only in the autumn.Conclusions: Splenic PMAs in the Vardar chub can be used as an additional biomarker of metal pollution, but with caution, since enhancement of the volumes and numbers of MACs depends on the exposure level of heavy metals, on the presence of the other contaminants, as well as on the physiological condition of the fish.</jats:p>
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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)
Manevska, Irina
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Kostov, Vasil
In this research, the common carp (Cyprinus carpio) was observed in two experimental groups with a probiotic-enriched feed. Group A received a lower concentration of probiotics and Group B a higher concentration of probiotics in the feed. The fish in the Control Group (C) did not receive any probiotics in their feed. Fulton’s condition factor and body mass were monitored by five control measurements. During the five control periods, the average body mass of the common carp in the Experimental Groups A and B displayed the significantly higher values when compared with the Control Group. Fulton’s condition factor was significantly lower in the Control Group (C) than in the two experimental groups, while no statistically significant difference was detected between the Groups A and B. These results indicate that a probiotic supplementation in aquacultural feed has a positive effect on the fish growth and its overall condition.</jats:p>
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INFLUENCE OF PROBIOTIC SUPPLEMENTED FEED ON GROWTH RATE OF COMMON CARP (Cyprinus carpio L.) IN AN INTENSIVE CAGE-CULTURED SYSTEM
(University Ss. Cyril and Methodius in Skopje Institute of Animal and Fishery Science, 2024)
Manevska, Irina
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Panchevski, Ivica
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Kostova, Marija
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Atanasova Panchevska, Natalija
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Kostov, Vasil
As a new technology solution, probiotic fish feed supplementation was the initial approach for this experiment to assess the influence of probiotic-supplemented food on the growth rate of common carp (Cyprinus carpio L.). The experimental design was set in a registered cage farm in a reservoir. For the trial, three cages were dimensioned. Two experimental groups were observed (A – with lower probiotic concentration, and B – with higher probiotic concentration) and a control group C, without probiotic feed addition. An equal number of 323 carp individuals were stocked in each group. The experiment was conducted over 180 days. The growth rate was evaluated during the experimental trial. The carp fed with probiotic-supplemented feed with lower concentration had a positive impact on growth rate (GR) (total, specific, and individual GR), i.e. carp individuals in group A during the first and the second phase, compared with control group C.
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DYNAMICS OF THE PLANKTON COMMUNITY ROTIFERA, CRUSTACEA (COPEPODA AND CLADOCERA) FROM ONE HORIZONTAL AND THREE VERTICAL PROFILES IN THE KOZJAK RESERVOIR
(Srpsko društvo za zaštitu voda, 2025)
Manevska, Irina
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Tasevska, Orhideja
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Slavevska Stamenković, Valentina
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Hinić Jordanovska, Jelena
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Kostova, Marija
The Kozjak Reservoir, as the largest artificial lake in North Macedonia, is characterized by high ecological and hydrological significance. This study focuses on the dynamics of zooplankton communities, specifically Rotifera, Crustacea (Copepoda and Cladocera), through research conducted along one horizontal and three vertical profiles within the reservoir. Zooplankton, as a key component of the ecosystem, was analyzed to determine its density and species diversity at different depths and profiles. The highest community density was recorded in the thermocline layers at a depth of 6 meters. During the summer period, Bdelloidea and Diaphanosoma populations dominate, while integrated samples show a significant presence of Eudiaptomus. Saprobiological analysis indicates β-mesosaprobic characteristics of the water, with values ranging from 1.2 to 2.6. These findings provide a basis for further understanding of the ecology of the Kozjak Reservoir and its biological productivity.</jats:p>
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ECOLOGICAL IMPACTS OF COAL MINING AND PHOTOVOLTAIC POWER PLANT OPERATIONS ON THE MACROINVERTEBRATE COMMUNITY IN OSLOMEJ RESERVOIR AND TEMNICA RIVER (NORTH MACEDONIA)
(Srpsko društvo za zaštitu voda, 2025)
null, null
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Hinić Jordanovska, Jelena
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Slavevska -Stamenković, Valentina
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null, null
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Manevska, Irina
Coal mining and photovoltaic power plant operation significantly impact the macroinvertebrate communities in freshwater ecosystems due to changes in water quality and habitat structure resulting from dramatic erosion processes. Therefore, monitoring the macroinvertebrate community serves as an important indicator of ecological health. This study presents the ecosystem conditions in Oslomej reservoir and river Temnica based on the aquatic invertebrate community. The obtained results showed that Oslomej reservoir and river Temnica suffer habitat degradation and put up with different pollutants, introduced through the soil and sediment that entered the reservoir and the river during the construction of the PV Oslomej 3, as well as from previous acid mine drainage from the coal mine “Oslomej”.</jats:p>
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Speaking their language – Development of a multilingual decision-support tool for communicating invasive species risks to decision makers and stakeholders
(Elsevier BV, 2021-01)
Copp, Gordon H.
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Vilizzi, Lorenzo
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Wei, Hui
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Li, Shan
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Piria, Marina
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 developed mostly in English language only, which increases linguistic uncertainty associated with risk assessments undertaken by assessors not of English mother tongue and who need to communicate outcomes to local stakeholders. To reduce language-based uncertainty, the 􏰢ecology-of-language’ paradigm was applied when developing the Aquatic Species Invasiveness Screening Kit 􏱜AS-ISK􏰛, a decision-support tool that offers 􏱘􏳏 languages in which to carry out screenings and communicate outcomes to stakeholders. Topics dis- cussed include uncertainty related to language-specific issues encountered during the AS-ISK translation and the potential benefits of a multilingual decision-support tool for reducing linguistic uncertainty and enhancing communication between scientists, environmental managers, and policy and decision makers.
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LENGTH-WEIGHT RELATIONSHIP AND CONDITION FACTOR OF THE ENDANGERED AND ENDEMIC PRESPA TROUT (SALMO PERISTERICUS KARAMAN, 1938) FROM LEVA RIVER, |KRANSKA RIVER AND BRAJČINSKA RIVER
(University Ss. Ciril and Methodius in Skopje, 2021-12-30)
Kostov, Vasil
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Manevska, Irina
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Arsovska, Julijana
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Manasievska Simić, Silvana
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. Electrofishing was conducted on a total of 27 sampling points on Leva, Kranska and Braj􏲎inska rivers. The results showed that Prespa trout have long and slender bodies with low weight value. The condition factor of Prespa L-W as a relationship between weight and length, is used for the growth pattern estimation and condition index, in order to enrich conservation studies and aid management decision makers at national level. L-W relationship and condition factor are closely related and useful for evaluation of fish populations.
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First data on the structure of the vertebral column in Gobio and Romanogobio species (Actinopterygii, Cypriniformes, Gobionidae) from Ohrid Lake and the Vardar River basin
(Pensoft Publishers, 2021-03-31)
Arsovska, Julijana
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Simonović, Predrag
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Kostov, Vasil
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Slavevska-Stamenkovič, Valentina
<jats:p>The validity of four gudgeon species known for the ichthyofauna of North Macedonia has been a matter of different taxonomic disputes (except for<jats:italic>Gobio ohridanus</jats:italic>Karaman, 1924). Recently, a restoration of the species status was proposed for<jats:italic>Gobio balcanicus</jats:italic>Dimovski et Grupče, 1977 and<jats:italic>Romanogobio banarescui</jats:italic>(Dimovski et Grupče, 1974). So far,<jats:italic>Romanogobio stankoi</jats:italic>(Karaman, 1974), has not been a part of any recent investigation and it is still considered as a junior synonym of<jats:italic>Romanogobio elimeius</jats:italic>(Kattoulas, Stephanidis et Economidis, 1973) or<jats:italic>R. banarescui</jats:italic>due to the lack of distinctive morphological characters. The osteological characters in the structure of the vertebral column, have significance to the systematics of the gudgeons, especially in elevation of<jats:italic>Romanogobio</jats:italic>at the level of genus. To contribute to resolving the taxonomic status in these gudgeon species, the goal of this paper is to identify distinctive characters by presenting and analyzing the structure of their vertebral column. Samples were inspected from the fish collections in the Institute of Biology (<jats:italic>G. ohridanus</jats:italic>), the Institute of Animal Science (<jats:italic>G. balcanicus</jats:italic>), and the Macedonian Museum of Natural History (both<jats:italic>Romanogobio</jats:italic>species). Fish samples were X-rayed as well as cleared and double-stained. Obtained data on the number of vertebrae were presented through the vertebral formula following Naseka (1996). Multiple Correspondence Analysis (MCA) was used to check the interrelation between taxa and the number of vertebrae in all units of the vertebral column.<jats:italic>G. balcanicus</jats:italic>is distinguished from<jats:italic>G. ohridanus</jats:italic>mainly in the predorsal and preanal subregion (10 vs. 11 vertebrae and 1 vs. 0 vertebrae, respectively), while<jats:italic>R. stankoi</jats:italic>distinguishes from<jats:italic>R. banarescui</jats:italic>by the number of vertebrae in the preanal and postanal subregion (2 vs. 4 vertebrae and 19 vs. 17 vertebrae, respectively). The structure of vertebral column offers distinctive morphological characters for the four gudgeon species from Ohird Lake and the Vardar River basin.</jats:p>
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A global-scale screening of non-native aquatic organisms to identify potentially invasive species under current and future climate conditions
(Elsevier BV, 2021-09-20)
Vilizzi, Lorenzo
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Copp, Gordon H
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Hill, Jeffrey E
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Adamovich, Boris
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Aislabie, Luke
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 areas across all six inhabited continents screened 819 non-native species from 15 groups of aquatic organisms (freshwater, brackish, marine plants and animals) using the Aquatic Species Invasiveness Screening Kit. This multi-lingual decision-support tool for the risk screening of aquatic organisms provides assessors with risk scores for a species under current and future climate change conditions that, following a statistically based calibration, permits the accurate classification of species into high-, medium- and low-risk categories under current and predicted climate conditions. The 1730 screenings undertaken encompassed wide geographical areas (regions, political entities, parts thereof, water bodies, river basins, lake drainage basins, and marine regions), which permitted thresholds to be identified for almost all aquatic organismal groups screened as well as for tropical, temperate and continental climate classes, and for tropical and temperate marine ecoregions. In total, 33 species were identified as posing a 'very high risk' of being or becoming invasive, and the scores of several of these species under current climate increased under future climate conditions, primarily due to their wide thermal tolerances. The risk thresholds determined for taxonomic groups and climate zones provide a basis against which area-specific or climate-based calibrated thresholds may be interpreted. In turn, the risk rankings help decision-makers identify which species require an immediate 'rapid' management action (e.g. eradication, control) to avoid or mitigate adverse impacts, which require a full risk assessment, and which are to be restricted or banned with regard to importation and/or sale as ornamental or aquarium/fishery enhancement.
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The effect of different pollutants exposure on the pigment content of pigmented macrophage aggregates in the spleen of Vardar chub (Squalius vardarensis Karaman, 1928)
(Wiley, 2020-09)
Ivanova, Lozenka
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Dragun, Zrinka
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Kostov, Vasil
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 impact was examined: Zletovska River (metals), Kriva River (metals and municipal wastewater), and Bregalnica River (municipal wastewater). Collected data revealed increased relative volume and number of MAs containing hemosiderin under the influence of metals, significant in autumn (p < .05). In chub exposed to metals combined with municipal wastewater, significant increase of lipochrome accumulation in MAs in autumn, melanin in MAs in fish captured in the spring season, and number of splenic MAs containing combination of melanin and lipochrome was noted. Volumes and number of MAs containing combination of hemosiderin and lipochrome increased in spleen of fish captured in autumn from both Zletovska River and Kriva River, most likely due to the contribution of hemosiderin and lipochrome, respectively. Values measured for the various pigments in splenic MAs in fish captured from Bregalnica River, were overall closer to the values measured for fish captured from Kriva River. Notably, melanin and lipochrome are more likely to be found in fish from waters influenced by municipal wastewater (organic pollution) and hemosiderin in fish spleen from water influenced by mining activity (heavy metals pollution).

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