Now I'm trying to catch me a big swordfish for my skill hall, now my question is. Will it come up as " You catch a big swordfish" or will it be the normal phrase, also will it have it's own stack if you bank it? Thanks in advance.

I don't remember the catch phrase, but it looks very different in your inventory and it also has its own stack in the inventory/bank.

be careful not to cook it though, or it reverts back to just a cooked swordfish

Ah good, I was worried it would look simalar.

but it wont cook if you just do a cook all on a normal one.