“Rainbow trout are not native to Korea and populations have been established in some watersheds. Most of Korea’s rainbow trout population is derived from privately owned commercial fisheries. The trout escaped by floods, accidents or illegal stocking and established fugitive populations in nearby rivers. The trout fishery here was abandoned long ago after being blown apart by a flood and creating one of the best rainbow rivers in the country.”
“But in the end, a small, pale-colored mayfly in Korea, Slovenia, or Chile pretty much looks the same as a small, pale-colored mayfly in Montana or Vermont. With a well-stocked flybox of nymphs and dry flies of the main three aquatic insects, you can fish the world’s trout streams and do just fine. ”
http://www.fieldandstream.com/article_gallery/Koreas-Only-Fly-Fishing-Guide/10
SwittersB & Exploring 