Fish still is agility. I did it Saturday. What you are seeing is a combination of these three bugs:
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If you are on a dedicated server, your thrall buffs never update in the status window on the upepr left. The window is blank always.
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If a thrall is ‘satiated’, they have to kill one thing before any stat upgrade percent happens from force feeding. This is true of all foods, not just the agility one.
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Sometimes, right after a thrall levels, he needs to kill one thing before the % bonus from foods healing him to his new hitpoint level shows up. Again, all level up foods do this.
Feed your thrall a cooked fish, and go kill a baby deer. You’ll see the 14% AGI show up.
I guess I should say that this isn’t only a display error. They actually do not get the % bonus when it is not visible.