I would be very concerned about the amount of mercury you are consuming when eating whale and dolphin meat.
It has been documented that some Japanese are eating dolphin meat and have no idea that they are. Call it a "bait and switch" pardon the pun. But anyways the amount of mercury present in the meat is insanely high.
I personally don't eat fish in general because of the filthy condition of the waters in Asia. They dump all their toxic crap in the water or there are fish farms where they pack as many fish in tanks and then load it up with antibiotics while the fish swim in their feces.
I don't want to sound like a hippie but I prefer eating "All Natural" food. My dad produces all natural dog food and really benefited when the Chinese made dog food poisoned many pets because there are literally NO standards in Asia. And the same goes for the veggies from Mexico where the workers crap and piss in the fields.
I actually have been healthier since eating all natural food than when I was eating whatever.
In 2004, a TV show in Japan actually explored this in Wakayama, because of the same concern as the one you voiced. They found that in fishing centers around Wakayama prefecture (Tanabe, Kushimoto, Taiji) the elevated mercury didn’t result in increased cancer or other problems.
Furthermore, Taiji was examined for mercury poisoning and none of its inhabitants exhibited any symptoms.
I’m also not worried about what I eat, because I wash and cook it. Nothing is 100% clean.