There are four Exotic fish in Destiny 2 Season of the Deep. Here's where to find and catch them all—and don't forget to bring Bait!
All Exotic Fish and How to Catch Them in Destiny 2 - Siliconera
How To Get Wicked Implement In Destiny 2's New Secret Exotic Quest - GameSpot
Destiny 2: All Exotic And Legendary Fish
Destiny 2: All Exotic Fish
News - April, 2010
How to Catch Aeonian Alpha-Betta Exotic Fish in Destiny 2 - Siliconera
Destiny 2 Season Of The Wish: How To Get All Wish-Keeper Exotic Catalysts
Why You Should Fish in Destiny 2 (& How to Catch Exotic Fish)
NetWorld!, by David H. Rothman