Trading Mitten Crab for Arapaima or Arowana

[Lord Levias]

The title is pretty self explanatory. I will trade an Arapaima or an Arowana for a Mitten Crab.

 

[GolguiAr]

I am pretty sure you cannot trade animals. They cannot be dropped on the floor, or sent in letters. Unless there is some sort of cheat way to do it?
Otherwise you would need to go to a town that is at the right season to catch them