Fig. 4

The temperature and depth profiles of four tagged eels released from the Sea of Japan coastline. The time series data retrieved from pop-up satellite archival tags are shown: A, B JZ1903, C JZ1901, D JZ1902, and E JZ1905. The tag type is represented in the parenthesis after each eel ID. A The depth–temperature time series profile retrieved from the X-tag are shown as the colored line. The gray shaded area denote nighttime and yellow triangle indicate the surfacing time of the X-tag. B–E The daily minimum and maximum temperatures recorded for each individual eel are represented by the gray bar lines