Hello,
To me, this fish shown on the photos is more Acentrogobius nebulosus than Y. criniger.
As comparision with these 2 photos on fishbase:
http://www.fishbase.org/photos/PicturesSummary.php?StartRow=0&ID=49161&what=species&TotRec=3
and
http://www.fishbase.org/photos/PicturesSummary.php?ID=7228&what=species
You can clearly see on the 2 pics in Reeflex than the specimens shown have significative spots on the tail (sign for A. nebulosus) and not the clear stripes of Y. criniger.
Plus, but it's not that clear on the phoos, A. nebulosus have a more slender and long head.
keine
