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Investigation of cyprinid fish species spawning grounds in Lake Ohrid
2003
Talevski, T. | Talevska, M. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
In this paper are presented investigation of cyprinid fish spawning grounds in Lake Ohrid. Keeping the optimum population condition of particular fish species is possibly only if we care to study and sustain fish spawning grounds.
Показать больше [+] Меньше [-]Comparing analysis of chlorophyll 'a' and phaeophytin 'a' concentrations in Palic lake [Serbia, Serbia&Montenegro]
2003
Camprag, N. | Lehoczki, I. (Zavod za zastitu zdravlja, Subotica (Serbia and Montenegro))
This work show and compare results of chlorophyll 'a' and phaeophytin 'a' concentrations during three years systematic examination. The samples were collected from the fourth sector of Palic lake, ones a month, during 2000, 2001, and 2002 using method by Szilagyi. Comparing values, a great seasonic changes of chlorophyll 'a' and phaeophytin 'a' concentrations is noticed.
Показать больше [+] Меньше [-]Fauna of monogenean trematods - parasites of some cyprinid fishes from the lake Dojran (Macedonia) [The Former Yugoslav Republic of Macedonia]
2003
Stojanovski, S. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia)) | Hristovski, N. | Cakic, P. | Hristovski, M. | Nastova-Aleksova, R.
During the parasitological investigations on the gills of 3 cyprinid species from Lake Dojran (the Former Yugoslav Republic of Macedonia), are found 4 monogenean species: in Rutilus rutilus dojranensis are found Dactylogyrus similis and Dactylogyrus suecicus, in Scardinius erythrophthalmus dojranensis is found Dactylogyrus difformis, and in Alburnus alburnus macedonicus is found Ligophorus sp. Prevalence in Rutilus alburnus dojranensis is 40.46%, in Scardinius erythrophthalmus dojranensis is 55.56%, and in Alburnus alburnus macedonicus is the lowest and amounts 2.02%. All monogenean species represents the first record for parasitic fauna of fish species in the Former Yugoslav Republic of Macedonia. Finding of Ligophorus sp. in the fishes of the family Cyprinidae is new to science generally.
Показать больше [+] Меньше [-]The importance of protection of the belt of stoneworts for the surviving of the benthic macroinvertebrate communities from Lake Ohrid
2003
Trajanovski, S. | Trajanovska, S. | Budzakoska, B. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
The most extended and deepest belt of macrophytic vegetation, the belt which almost without exceptions define the lower limit of littoral region of Lake Ohrid, consists algae from the family Characeae. Permanent presence of sunlight, well oxygen saturation, their density which decreases the waves action, together with the facts that these algae are food and shelter for the numerous endemorelic species from the very rich fauna of macro invertebrates, make the stonworts the most attractive life habitat in Lake Ohrid. Our results are found on researching of three types facies from four different localities in Lake Ohrid: sandy-muddy facies without of stoneworts, facies covered by stoneworts and facies covered by Gastropod and Bivalvia shells, also without of stoneworts. Without exceptions, in all four localities we approved the mentioned affirmation about the great importance of the stoneworms as life habitats, both by the number of present taxa and the density of the macro invertebrate communities.
Показать больше [+] Меньше [-]Change in biodiversity of ichthyofauna from the Lake Ohrid [The Former Yugoslav Republic of Macedonia]
2003
Taleski, T. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
Every country must to concern the biodiversity of flora and fauna, especially in ecosystems rich with endemic and relict species. Such ecosystem is the Lake Ohrid.
Показать больше [+] Меньше [-]Changes in the composition of gastropod fauna of the profile HBZ-Radozda from Lake Ohrid
2003
Budzakoska, B. | Trajanovski, S. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
In this paper, we present the results from both quantitative and qualitative composition of the Gastropod fauna from Lake Ohrid (profile HBZ-Radozda) with their vertical distribution in littoral and sublittoral region of the lake. The results of our investigations shows some changes in biodiversity and the density of gastropod communities that settle this profile, compared with the investigations made 30 years ago.
Показать больше [+] Меньше [-]Activities of extracellular acid, neutral and alkaline phosphomonoester-hydrolases in the water of littoral region of Lake Ohrid
2003
Vasileska, A. | Novevska, V. (Hidrobioloski institut, Ohrid (The Former Yugoslav Republic of Macedonia))
The activities acid, neutral and alkaline phosphatases, as well as total phosphatases activities were estimated in the water of the Lake Ohrid tributaries Sateska, Koselska, Velgoska and Cherava. The same analyses were performed in the littoral zones where the tribitaries enter Lake Ohrid. The study covers the period from September 2000 to October 2001. The obtained results show that different types of phosphatase effect different extracellular activities, an observation which is probably the result of differences in the location within the cells and the way of intracellular synthesis.
Показать больше [+] Меньше [-]Water quality of the littoral zone of Lake Ohrid at tourist locations [The Former Yugoslav Republic of Macedonia]
2003
Lokoska, L. | Jordanoski, M. | Mitic, V. | Patceva, S. | Veljanoska-Sarafiloska, E. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
The aim of this work is to confirm water quality of the littoral zone of Lake Ohrid at tourist locations during the tourist season 2002. Water quality is presented through following microbiological and chemical parameters: number of psychrophilic and mesophilic heterotrophic bacteria, urolitic bacteria, most probable number of total coliforms (MPN), indicators for fecal pollution (Escherichia coli, Clostridium perfringens), chlorophyll a, dissolved oxygen, biochemical oxygen demand for five days (BOD5), organic loading and total nitrogen.
Показать больше [+] Меньше [-]The biomass investigation of Potamogeton perfoliatus L. from Lake Ohrid in the localities with different anthropogenic influence
2003
Talevska, M. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
In this paper investigations of biomass of red head grass Potamogeton perfolitus L. from Lake Ohrid were presented. The material was collected from 2 localities along the Ohrid Lake's coast (Grasnica and Kaneo), where anthropogenic influence is different expressed. The results from the investigations show that there are differences in biomass between investigated localities.
Показать больше [+] Меньше [-]Comparative investigations of the macrophytic vegetation and ichthyofauna from the Lake Ohrid [The Former Yugoslav Republic of Macedonia]
2003
Talevska, M. | Talevski, T. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
In this paper is given the comparative review of investigation of the macrophytic vegetation and ichthyofauna in 4 localities (Grasnica, Gradiste, Veli Dab, and Cerava) from the littoral region of the Lake Ohrid. In the investigated localities are evidenced macrophytic species and fish species as bioindicators for saprobility. Based on the obtained results, it can be concluded that qualitative composition of macrophitic vegetation and ichthyofauna are different and depend from locatities where investigated made.
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