Small yellow fish (30mm TL) caught among Fucoids in a middle shore pool, N. Cornwall
No interactions present.
for the poor quality of the image.
Its not a bad photo at all considering the size! Good spot.
Unfortunately the id is not as straightforward as it first seems. Some sources including my Marine fishes on Wales book which is normally very good have 2 species a. dentatus and a. microcephalus. Worms (http://www.marinespecies.org/aphia.php?p=taxdetails&id=272523) the best resource on marine taxonomy that I have found says that they are in fact the same species and that a. microcephalus is a synonym. So, so far so good ID wise however there is another species the two-spotted clingfish (Diplecogaster bimaculata) which is identical except for different teeth and in males only the two spots. So this is either a. dentatus or a female two spotted clingfish!
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
This has been subsequently discussed in http://www.ispotnature.org/node/289896 proving how valuable iSpot resource is.
Lat/Lng: 50.54459, -4.98123
OS grid ref: SW888758