Does uti cause vaginal fishy odor?

Usually not: Watery fishy smelling discharge is classic for bacterial vaginosis. With a bad case of BV you can have some irritation and UTI like symptoms of pain/burning with urination. See a local Family Medicine doctor or OB/GYN and have them examine you and test for BV. This is usually easily treated with a course of antibiotics.

No, BV does!: Sometimes disturbances to the natural bacteria in your vagina (douching, irregular bleeding, unprotected sex, etc) can allow abnl bacteria like Gardnerella to overgrow and cause a fishy odor. It's not sexually transmitted, but can be treated w/ Metronidazole(Flagyl)/Clindamycin/Boric Acid. See your GYN for a prescription and be examined for other potential causes. Nothing urgent/dangerous though.