Legion Fishing: Conjurer Margoss - Whats the deal?

Conjurer Margoss is located on an island just off the edge of new Dalaran.  He can be reached, before flying, using the goblin glider if you don't have class specific talents such as levitate.  You can also fish up a consumed on use token, Emblem of Margoss, from the Underbelly in Dalaran  which will transport you to the island. 

Margoss requires you to hand in rep tokens, Drowned Mana, for 50 rep each, in order to become Best Friends with him, much like Nat Pagle in previous  expansions.

You can fish up the Drowned Mana in the lake on Conjurer Margoss' island although the drop rate isn't great.  You can also fish up boss tokens Mark of Aquaos which when thrown into the lake will spawn the boss Aquaos the Unleashed.

Once killed this creates a water shower/bubbles over the lake lasting for a few minutes.  While the bubbles are present 1-2 Drowned Mana is caught on every cast.  

Collecting enough Drowned Mana to become best friends (rep goes from Stranger - Pal - Buddy - Friend - Good Friend - Best Friend) takes a very long time if you try and do it solo.  The fastest way to complete this is by joining a raid group using the group finder.

With 40 people fishing together Aquaos is almost always up making collecting all the mana needed for the rep plus all the mounts, pets and toys take about 2-3 hours.

The vanity items sold by Conjurer Margoss are:

Friend - Crate of Bobbers: Squeaky Duck (toy)
Friend - Crate of Bobbers:Murloc Head (toy)
Good Friend - Sting Ray Pup (pet)
Best Friend - Trashy (pet)
Best Friend - Brinedeep Bottom-Feeder (mount)