DarkEngine :
hahahah..........Thanks man. But what if there are bits of tuna in it??/
What kind of pickles can you buy in a store that have bits of tuna in it lol? But as far as 6 month old pickles that have been opened they should be fine, the tuna is the wildcard in the whole situation. Assuming it was cooked in some sort of fashion (i.e. not completely raw) before being introduced to the pickling brine then yes it'll be fine. The liquid will prevent bacteria and other pathogens from forming just like it does with the cucumbers (pickles)
DISCLAIMER: If you eat them and get sick it's not my fault