The Secret Fish Have Been Found!
Thanks to the whole community for their efforts in discovering the last remaining secret fish, this couldn't have been done without everyone that was involved.
The Secret Fish Rewards
Completing the achievement Secret Fish of Mechagon rewards you with the Secret Fish Goggles which allows you to find secret fish throughout Azeroth. Completing the achievement Secret Fish and Where to Find Them rewards you with the Hyper-Compressed Ocean toy, which creates a huge water sphere that you can fish in for 15 minutes.