Abstract
Research dives with PISCES IV in the Bay D'Espoir fiord system of southern Newfoundland revealed a rich and abundant fauna inhabiting the rock walls in the warm deep (790 m) central basin. The giant file clam Acesta excavata, otherwise unknown in the western North Atlantic, was in many places a dominant species. Species otherwise known from continental slope depths quite removed from the fiord included the anemone Actinauge sp., sponges, alcyonarians, the fish Phycis chesteri and Nezumia bairdii and the gooseneck barnacle Arcoscalpellum mitchellotianum. The food source for this abundant fauna is unknown. Nearby cold water basins are impoverished with respect to the fauna.
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