Status of the burbot (<i>Lota lota</i> L.) in the Lower Danube (Bulgaria) - a species threatened by climate change.

We calculated a decreasing trend in the number of the days with Tw below 5 °C during the winter (Fig. 10 , left), a strongly increasing trend of prolongation of the summer stress with Tw higher than 24 °C (Fig. 10 , right), and a trend of average increase of Tw with 0.056 °C per year (Fig. 11 ) for 2000–2017.

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