Live coloration and diet of Gobius gasteveni (Teleostei : Gobiidae), with a first record from continental Europe.

The gobiid fish Gobius gasteveni, hitherto known only from 39 specimens fou nd in the English Channel, at Madeira and the Canaries, was found in fairly good numbers on the north-western Spanish coast. This first record for the continental European fauna allows us to recognize and describe for the fir st time the normal and defensive live coloration, as well as the diet of th is species. The general coloration is orange-brown, pale or dark depending on mood, wit h 6 to 9 darker blotches along the lateral mid line. The high colour contra st in the defensive mood shows a conspicuous white terminal fringe of the d orsal fins, and also sparse light-blue spots on the membrane. The diet is based mainly on crustacea, with a high percentage of the decapo d Pisidia longicornis, and polychaetes.