That's my rule also. I'm mostly pescetarian, and don't eat freshwater fish neither raw or cooked. Even some salt-water fish is not recommended to eat raw. But

That's my rule also. I'm mostly pescetarian, and don't eat freshwater fish neither raw or cooked. Even some salt-water fish is not recommended to eat raw. But frequently even fishmongers and chefs themselves don't know the exact spicies of the fish they selling or serving. There is so much of mislabeling in that industry, so it's impossible to know without DNA testing. I encountered even some celebrity chefs preparing raw dishes from freshwater fish. Some even doing it to save money, knowing that it may cause liver cancer to their customers. It's not that eating raw freshwater fish will always lead to the health problems, the fish should be from an endemic region, but it's still a lottery.