I just killed 20 bears and the something/20 is no longer there when I talk to Mawdryn. However, he is still asking for the bears, no level increase either...
There are only 2 out of 4 working Fishing daily quests. As I've only played in Yllse, I do not know the name of the maps in Vys or Zyp. It would be in Yllse's Sedless's equivalent. Where ever the fishing area is on said map.