Fresh fish?

Catch it yourself.
Freshest I've had is either Rainbow trout straight from the stream...
Cleaned it on the bank, and fried it in a little saved bacon fat.

Or the Yellowtail tuna sashimi... On an overnight fishing boat out of San Diego. As the deckhand cleaned and filleted our catch, he'd flip slices to us. There is the reason for wasabi in the tube!