When you have a smell from your Vagina it's most likely due to harmful bacterial growth which can lead to other health problems.
So if your Vagina is smelling like fish it's possible it could be a Urinary Tract infection that is causing the fishy Vaginal smell and you need to see a doctor to rule that possibility out.
You can help keep the fishy smell away by through washing of your Vagina during a shower and wear loose fitting clothing.