Again, it's kinda weird. I would say it's fairly easy to be vegetarian since there's a cultural understanding of vegetarians due to the cultural/religious practices of Buddhist monks.

For one, they typically have more bland foods, and typically live in the mountainous regions where there's less access to sea food. And again, what a lot of east Asian people consider meat varies from the western nomenclature.

Where instead of basing the ethical delineation on a scientific taxonomy, it's based more on whether something possesses a soul/conscious. If we examine the issue through that lens it can make sense that an invertebrate like a krill or even coral are closer to plants than mammals.