Seasonal and vertical variations of water temperature and oxygen content in the Dospat reservoir, Bulgaria
2011
Hadjinikolova, L., Institute of Fisheries and Aquaculture, Plovdiv (Bulgaria) | Iliev, I., University of Plovdiv Paisii Hilendarski, Plovdiv (Bulgaria). Faculty of Biology, Department of Biochemistry and Microbiology
The changes in water oxygen content depending on the water temperature and depth of Dospat dam lake for the period May 2009 –April 2010 were investigated. The dam lake is situated in the Western Rhodopi Mountain. With it's altitude of 1200 m above sea level it is the highest dam lake in Bulgaria, with a total of 22 000 dka of flooded area. The average surface layer temperature values vary from 9.6 deg C (April) to 22.74 deg C (July). In the summer months these values are within the limits of 17.26 deg C – 22.74 deg C (0.5 m dept) – 5.26 deg C -5.47 deg C (30 m dept). Lower temperature values were reported during the spring (April-May) and autumn (November). The horizontal differentiation indicates that the average surface layer values of the oxygen content in the water vary from 4.22 mg/l to 11.48 mg/l. In the summer months sampling points the values were within the limits of 4.22 mg/l–7.47 mg/l (0.5 m depth) and respectively of 1.12 mg/l - 1.60 mg/l (30 m depth). These investigations gave the possibility to determine the periods and the depth zones with optimum values of temperature and oxygen content for trout rearing, which can be used for optimization of the technological process of the net cage aquaculture in Dospat dam lake.
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