On the origin of spring fish mortality cases occurring to alburnus belvica karaman, 1924 and alburnus scoranza bonaparte, 1845 in Albania


The metabolic rate of fish, as all poikilothermic livings, is closely dependent on the temperature. The analyses of fresh total body of 620 freshwater fishes (respectively 400 specimens during the years occurring fish mortality cases and 220 during other years without outbreak) from 2 species (Alburnus belvica Karaman, 1924 from Lake Prespa and Alburnus scoranza Bonaparte, 1845 from the Fierza reservoir in Ohrid-Drin-Skadar/Shkodra drainage) originating in natural waters. The data revealed the average values from 30.85 to 12.48 % dry matter, while the gross energy content ranged from 5.83 to 11.88 MJ/kg. Based on our data ones the gross energy content is below 3.8 MJ/kg then the diseases and mortality are occurred among fishes.


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