Hello
Klaatu347, I know, it looks as if it is a writing error, and when we had this quest on Gf1 it also said 10 kg at first, and then later it was corrected to 100 kg.
But, this time I confirmed with the dev team that 10 kg is correct, and the quest will credit the catch of the target fish over10kg. It's a nice break for players, I guess.