A few fishing suggestions:
1. Make rock worm meat (fish eat worms) and fish/reptilian scales (lures) targetable as bait. Weight vs bait bundles offsets the gold saved.
2. Suggested Flavor Item: "Can of Worms" For sale at fishing vendors. When target PC adds10 squirming worms to PC inventory (useable as bait). When target thrown unleashes 3 hostile rock worms. (should be slightly more expensive, slightly less weight then bundle of bait)
3. Add fishings spots: The Underwater Lair (Scamander), Along the Scamander, The Dark Canal (am I just missing where these spots are?)
Any other fishing suggestions out there from ya'll?