Black Triggerfishes congregate and feed near the surface so snorkelers see them often. They’re mostly black with bright lines at the base of their dorsal and anal fins, but they can also display iridescent blue lines between their eyes and blue lines along the length of their bodies.
Graham's Island 
Nice!
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Thanks Janet.
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These look so cool.
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They’re fun little fish and when their colors show they’re quite striking.
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