From the looks of it, halibut's optional.  Maybe it's the shredded stuff that looks like carrots, but when confronted with shredded stuff that looks like carrots, it seems wise to assume it is shredded stuff that is carrots.

Also from the looks of it, you are strongly advised not to let lemons overwhelm the delicate flavors of the dish. Scoop out the pulp and garnish with rind-corpse!