Legion Fishing: Fisherfriend - Akule Riverhorn

Akule Riverhorn is located in Highmountain on a small boat in the river that surrounds Thunder Totem, to the west (32:42).

He says:
"The rivers call to me"
"How can I help?"
"I am collecting the hundreds, maybe thousands, of pieces from the shattered totem.  You might have some luck finding them with a fishing pole."

Rep token: Ancient Totem Fragment

Boss token: Water Totem Figurine

Boss: Tarn Riverhorn

The  Water Totem Figurine will spawn Tarn Riverhorn who jumps onto the boat.  Killing him will apply two totems giving 100% chance to fish up the Ancient Totem Fragments.

From my first 100 casts I got:

18x Highmountain Salmon

65x Silver Mackerel

13x Ancient Totem Fragment

4 x Water Totem Figurines (giving 69 Ancient Totem Fragments)

Akule Riverhorn sells the following items depending on your rep level:

Buddy - 10x Highmountain Salmon
Friend - Lures: Swollen Murloc Egg and Frost Worm
Good Friend - Lures: Funky Sea Snail, Trawler Totem (toy)
Best Friend - Crate of Bobbers: Floating Totem (toy)

Trawler Totem (use: summon a Trawler Totem, granting 4 fishing skill to all nearby players for 2 min.)