Sammendrag
During a survey of Nudibranchs (Mollusca, Nudibranchia) in the inner parts of the Trondheimsfjord, a total of 21 dives (SCUBA) in seven different localities in the Beitstadfjord, the Borgenfjord and at Ekne were carried out. A total of 16 different species were found, of which three are new records for the Trondheimsfjord, and of which new or important records of ecological knowledge were observed for 10 species. The results proves diving with SCUBA to be an important method for studying nudibranch biology, a method not previously used in Norway.
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