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Thats a nice shot of the rock goby, we have a very nice specimin in our native tank at the college where I teach that was brought in by one of the children in my afterschool club. It has gotten very large now measuring around 15 cms!
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
Lat/Lng: 50.7, -3.0
OS grid ref: SY3492