Didrik Nils Lund

I am new to this forum and am trying to find records of my g-grandfather coming to NY as a merchant marine, at least that is the story. He was the son of Georg Lund and Henrikke Margarethe Fischer. Born in Bergen on 10-10-1866. Henrikke was born in Nykirken 3-5-1834. Her fathers name was Didrick Nils Fischer. Georg Lund his father was born on 12-8-1832. I have a lot of information of the family going back to Norway, but cant seem to find when he arrived in the US. I found somewhere where he was a chandler in the US census records, and the story was he came over as a merchant marine. Any help would be appreciated.