IMHO, a salt bath is unnecessary when the parent stock is sourced from the destination pond and the harvested forage isn't clearly infested. If there were a very bad infestation in the forage pond, I think I would err on the side of safety and use them as fertilizer for tomatoes or something like that.
Rusto and I recently helped Snipe and John seine and transfer fish from a forage pond. It was a lot of hard work!
There have been discussions in the forage pond threads of plans to "directly" transfer forage fish to the main pond. This sounds great in practice to eliminate the hard work of seining and it also reduces the handling of the fish. However, I can easily imagine a non-expert like myself missing parasites in the forage pond and moving them right over to the main pond.
Would you advise a rule for direct transfers, such as: ALWAYS dip net or minnow trap a sample of your fish for examination before making any transfers.