As part of the Grouper Moon Project in Little Cayman, Cayman Island, this study used the sound produced by Nassau Grouper, Red Hind, Black Grouper, and Yellowfin Grouper to monitor the positions of these fish during the Nassau grouper spawning event that occurred in 2017. By using fish sound recorded by multiple instruments, we were able to monitor the presence and location of these fish before, during, and after the spawning. These continuous and overnight records added valuable observations to the limited period of times when divers are able to survey the area. Knowing the locations of the fish, it was possible to measure how loud these fish sounds are and determine how far they may be detected. The authors found that Nassau Grouper sounds were the loudest and may be detectable up to 300 m at this location. Additionally, the timing and locations of sound production suggest that there is no Nassau spawning events that occur during the night, but there may be overlap in space and time between Red Hind and Nassau Grouper spawning aggregations. 

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