What ships left sweden in 1915 or 1916 and docked in ottawa/halifax canada

Ottawa was not a port of entry. Library & Archives Canada offers a searchable database where you can put in the place of departure and discover which ships departed from Sweden during your specified time period.

I have a nephew who is looking for his biological mother. He knows her name but nothing else. I know that she would be in her 30's to early 40's in Ontario Canada. We don't know if she has married or not. How does he go about looking for her?

Apply for his adoption records! The Access to Adoption Records Act now allows adoptees to access their birth information.