Dear Ms. Dumont,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located three record series titled Crew Lists, 1811 - 1918, Records Relating to Vessels, 1793 - 1927, and Collectors' Records, 1798 - 1957. These record series are a part of the Records of the U.S. Customs Service (Record Group 36) and include crew lists for the Collection District of Boston and Charlestown, Massachusetts. To access these records, please contact the National Archives at Boston (RE-BO) via email at email@example.com.
If any of the ships he served on were flagged as Canadian vessels, there may be relevant records at the Library of Archives Canada.
We hope this information is helpful. Best of luck with your family research!