I am experiencing a strong fishy vaginal odor , but with no discharge, no itchiness & dryness. what could this be ?

Vaginal infection: In spite of "no discharge" the abnormal bacteria in your vagina are causing an infection. The fishy odor is from the breakdown of chemicals that now produce putrescene and cadaverene which are, as they sound, very unpleasant to the "discriminating noses of the world." See a GYN MD now for diagnosis and Rx, and preserve everyone's sense of smell.