We have had some reports of players making special chum and it not being credited. However, what appears to be happening, is that the wrong recipe is being selected when starting production.
 
The first 9 recipes in Dockyard will give you regular chum. The last 6 recipes are special:
 
- Clam Chum
- Oyster Chum
- Shrimp Chum
- Herring Chum
- Tuna Chum
- Lobster Chum
 
So if you wish to produce Tuna Chum, make sure that you are selecting the recipe "Tuna Chum" and not "Chum". If you are not sure what type of chum you require in order to fulfill market contracts, you can mouseover the chum icon and the tooltip will let you know.
 
Happy fishing!