Black-Face Blenny, male (Tripterygion delaisi), Les Fourmigues, Presqu'île de Giens, France
This blenny specie presents a strong sexual dimorphism. Male individuals are yellow with a black face during reproduction period. Otherwise, male and female individuals are grey, brownish, or red.
Olympus OMD EM5 MkII, Zuiko 12-50mm Lens in Macro mode, Nauticam Housing, Dual Inon Z-240 Strobes. Settings 1/160, f/20, ISO250