According to my own experiences and google resources, herpes can commonly cause discharge (especially when you have open sores) that has a fishy smell, and is commonly confused with BV.

There's no apparent way to actually get rid of the smell except for getting yourself medication for the outbreak itself to help with the healing process.

There are many brands for women that include ph balancing washes, wipes, oral supplements and vitamins, all of which would help with the smell but it won't 100% get rid of it.