Figure 10 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 10 Sum of days with water temperature appropriate for reproduction and egg incubation (Tw <5 °C, left) and summer stress duration (Tw >24 °C, right) per seasons (data source: Executive agency for exploration and maintenance of the Danube river (EAEMDR)).