Mariculture's autofisher is sometimes producing "phantom" items - items that can't be shift-clicked from the gui and dissapear once thrown/placed. Happens mostly to pearls, junk (sticks, leather, etc) and vanilla fish

I've not had this happen to me yet, I'll do some more experimenting, I've changed the loot/fish stuff a little bit so I may have fixed this on it's own in my dev.

ok, i have, it's one of those silly instances where i forgot to do .copy when fetching the loot, so it's generating item stacks with a stack size of 0.

Fixed in 1.2.2