I had the opportunity to head back up into the mountains on Monday through Majia village to the Shalawan waterfall area with my fly rod in tow. Having seen several good 8-10" fish in this pool above the waterfall earlier in the season, I hoped to snag a bite or two, but the fish stayed at the bottom all afternoon. The water was incredibly clear and I could easily spot them on the bottom a good 15' down without sunglasses. It also didn't help to have two wild girls running through the water and climbing around on the edges of the pools, but then again, fishing was not the primary goal for the trip and the place is so spectacular it was hard to be too upset!
If you haven't made the trip to Shalawan, the drive alone is worth the time even without the short hike at the end. The access road climbs along the contours of the river valley below, snaking eastward and upward toward the northwestern flanks of Beidawushan北大武山 the southernmost 3000m peak on Taiwan. There are several good blog guides to the area. We used Taiwan's Waterfalls the first time we visited, but Follow Xiaofei also has some great photos and videos of the area. Incidentally, if there are any birders out there, I've seen and heard Plumbeous Redstarts around the pools above the waterfall every time I've been there (August & October 2015, March 2016).