With all this warm water tuna being caught. And eating it raw is my preferred method. What steps do I need to take to insure my brain doesn't get eaten by some worm? I lived through the 70's 80's, I have diminished brain capacity as it is. I see in videos in Japanese fish markets where the Bluefin are so cold they have a frost layer on them as they are dragged to the block. What is the way you guys care for your sashimi grade fish? Thank you for looking.