The issue I have heard with tuna is that when they catch them all together some Rabbonim are worried that you get dolphins mixed in and then they are all processed, chopped up, and canned without the dolphins ever being removed.
When purse seine fishing was first used to catch yellowfin tuna, fishermen would deliberately chase dolphins to get the yellowfin tuna that would swim among dolphins. I don’t know of any instance where canned tuna was contaminated by dolphin meat and I couldn’t find any referance of actual contamination.
Albacore does not swim among dolphins.