Fig. 5

Vertical movement patterns of four X-tagged eels: A–D HM1905, E–H HM2001, I–L HM2006, and M–P JZ1903. HM1905, HM2001, and HM2006 were released from the Tokai region and JZ1903 was released from the Sea of Japan coastline. A, E, I, M Part of the time series data of the vertical movement of X-tagged eels. The colors of the lines in the time series data indicate water temperature and the shaded area indicate nighttime. B–D, F–H, J–L, N–P The vertical temperature profile (B, F, J, N), the frequency of swimming depth (C, G, K, O) and temperature (D, H, L, P) of the eels through the tracking period. The colors in the scatterplot and histogram indicate daytime (yellow) and nighttime (blue) data