AAQ, the “some” who are machmir on canned tuna include rav moshe feinstein. He held that there needs to be a mashgiach on the boat at all times, to prevent mixtures of tuna and crustaceans. Salmon may have been different, since it has a distinct color. The issue didn’t involve bishul akum as far as I know.
The OU allowed it, and certifies bumble bee and other companies that do not have full-time mashgichim. Rav Aharon kotler held this was acceptable.
Canned tuna was one of the very few things that rav belsky would not eat with an OU certification.