Still haven't fiddled with the lake trout, but I made barramundi ceviche last night...it was excellent--a nice, medium firmness (no problems with disentigration) and the preparation gave the fish a good zing.
I sliced the skin off of a smallish filet, chopped the fish into a half-inch or smaller dice, and tossed with enough lime, lemon, grapefruit and just splash of yuzu juice to cover. Marinated for about two hours (I wanted to make sure it was fully 'cooked' in citrus out of fear-o-aforementioned parasites), tossed with chopped red onion, salt-pepper, and topped with avocado dice and served on an El Milagro tostada.
Here's the slightly more involved
recipe that I drew from for this experiment...I might attempt the yuzu foam next time.