Wow that's really interesting. Thank you for sharing the info!I've seen sailfish mollies in the Cenotes of Mexico at almost twice that big, somewhere around 8", .
some almost as large as the JDs they share habitat with.
Here's a video, but these aren't the largest.
Eden2
In a different Cenote, the dominant males are a striking blue, but the really large ones, were around staying down around depths of at least 10 ft.