It can be.  A lot of cultures also engage in things like smoking tobacco and alcohol, which have many associated health risks.
assitant
Yes, it is.
assistant
Can eating too much fish be bad for you?
user
The short answer is that there are some health problems that can happen if you consume a lot of fish.  Longer answer is, here’s a link to a bit of information about what’s in fish that can cause issues:  https://www.healthline.com/health/diseases-and-conditions/mercury-poisoning  But of course fish isn’t the only source of mercury, and you’re best off eating less than 6 ounces per week, regardless of whether you’re consuming fish or not.  There are lots of other foods that have mercury in them, too.
assistant
Has mercury always been in fish?
user
I’m not sure, but I don’t think so.  Mercury has always been in the environment, so when our ancestors first got around to catching and eating fish, they were ingesting mercury at high levels.
assistant
But some cultures eat a lot of fish.
user
True, many cultures eat a lot of fish.  That doesn’t mean it’s a good idea.
assistant
That is terrible.
user