What is this stuff? Blue Heron Bridge, of course

[tarponchik]

While editing a pic of scorpionfish I took under BHB, I've noticed something (no, not the arrowcrab). What is that thing stretched across the base of the pectoral fin?
Does not look like a weed.

The fish on the 3d photo = hairy blenny?

 

[Full Circle]

3rd photo = Probably Masquerader blenny, Labrisomus conditus, in the Hairy blenny complex. I’ve photographed them often at BHB. Less seen is the Mock blenny, L. cricota, difference being first three dorsal spines taller than the rest. From DNA sources there is yet to be an L. nuchipinnis from Florida.
Shorefishes - The Fishes - Species

 

[tarponchik]

Thanks! These are not listed in Humann & Deloach, unfortunately.

 

[Full Circle]

Thanks! These are not listed in Humann & Deloach, unfortunately.

Pages 314-5 in the 4th Edition of the book

 

[tarponchik]

I got the 3d. Looks like I need to upgrade, thanks again.