Somewhere on teh intarwebs Steve Pope wrote:
[snip]
> (Tangentially: in Hawaii, they sell:
> normal-grade Ahi,

Longline caught (usually), pulled aboad dead on the hook, put into ice
slurry when landed.

> sushi-grade Ahi

Landed on the boat alive, bled out and put into an ice slurry within
minutes.

> at a higher price that looks identical, and cheaper pet-food-grade Ahi
> that looks only slightly worse.)

Dead on the hook, line having been set for more than 12 hours (no upper
limit), not chilled properly on the boat.
--
Shaun.

"Give a man a fire and he's warm for the day. But set fire to him and he's
warm for the rest of his life." Terry Pratchet, 'Jingo'.