You are not thinking this creative enough. With sharks it's one bite and it's over. It should be something with real agony. Like rats with blunt teeth, or a murder of crows (yep, flock of crows is a murder). Hyenas would be good, they'd laugh to him between bites.
If it is fish, I'd go for piranhas
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Or crocodiles, I'd settle for crocodiles
Or maybe
If it is fish, I'd go for piranhas
And because the ochre orc loves his hair so much, there has to be scalping