This quest is no longer available in game.
Collect 12 Stunned Whitepetal Carp.
I've been talking to Tantan here... again... and he insists that fishing is some kind of fabulous. I was skeptical, but I gave it another go. I'm not a big fan of that whole holding a stick and waiting method though, so I tried something a bit more direct.
Would you be a doll and go collect any of the still intact fish floating belly up in the lake for me?