I made this Moist Fillet farming guide to help out players who want to farm meat instead of buying them from the Auction House. I decided to search for places with a high density of mobs which I can kill and drop Moist Fillet. I traveled around Nazjatar, and after a while, I made a list of places.
Nazjatar - 1
The best place to farm Moist Fillet is at the Forgotten Tunnel in Nazjatar. The Deeptide Frenzy in the small lake has a fast respawn rate. (I feel like this will get nerfed really soon.)
Nazjatar - 2
Kill Abyssal Eels, Coral Slitherers, Deeptide Frenzy and Razorshell Turtle around the marked areas.
While I was farming there, the respawn rate was fast enough that I could just farm at the area marked with number one, but if you are killing the mobs too fast you have to move between the two areas. (kill turtles along the way between the two).
Nazjatar - 3
Kill all kinds of beasts around the marked area.