Lašišinių žuvų gausumo tyrimai Dubysos regioniniame parke, Dubysos upėje bei jos intakuose
In this masters work underway salmonidae family - Salmo salar L., Salmo trutta trutta L. and Salmo trutta fario L. population viability and plurality research in Dubysa river, Dubysa regional park. The object of the study: - In Raseiniai districk situated Dubysa regional park teritory in the streami...
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| Format: | Master Thesis |
| Language: | Lithuanian English |
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Institutional Repository of Aleksandras Stulginskis University
2010
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| Online Access: | http://asu.oai.elaba.lt/documents/1783596.pdf http://asu.lvb.lt/ASU:ELABAETD1783596&prefLang=en_US |
| Summary: | In this masters work underway salmonidae family - Salmo salar L., Salmo trutta trutta L. and Salmo trutta fario L. population viability and plurality research in Dubysa river, Dubysa regional park. The object of the study: - In Raseiniai districk situated Dubysa regional park teritory in the streaming Dubysa affluent , and in Dubysa: Dubysa (above Ariogala bridge and between Ariogala and Geluva), Dratvinyje (above Lyduvenai) and Tvarkanteje (above Akstinai). The aim of the study: - explore abudance of salmonide, what kind of circumstances influence their abudance, to establish who have influence fot fish stock boast, sugest a means to improve fish reserve. Methods: - to diagnose profusion of the salmonidae we use impulsive flush electro fishery device , by the method of Zippin was definable numerous and biomass of the fish. In every place was underway two or three catches, it depend on plenty of fish. Was measure temperature of the water amount of the melting water, visual estimated compositon of the soil. Investigation facts calculated in percents, measure up composition of salmon age. The results: - to value superfluitu of the salmon, viability, and concider the circumstanstances of the enviroment. Willing to save abundence of the salmonidae, the necessary ti save them. So departments, agencys, they need to use the means of protection salmonidae, postively control fishing the salmond in the moment of spawning. Also we need to protect water pools from pollution, to employ effective protection of biodiversity, with natural ecosystem. Racionally use natural resources, reduse waste and dung level and their noxious effect for nature, give more information to people about that, what damege for fish gives pollution rivers and other water mines. |
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