Figure 2
From: Patterns of biophonic periodicity on coral reefs in the Great Barrier Reef

Example of daily periodicities over three example days of fish choruses (I – VI) around Lizard Island. Mean square pressure for Chorus I to VI is in frequency bands 400–700, 340–360, 20–280, 90–150, 150–500, 260–350 Hz, respectively. Black circle = sunset; red circle = sunrise.