"I've had amazing feedback from the retailers where the fish have been placed.
"They say the fish have really made quite an impact on business.
"Quite a few people have voted already and due to the popularity of this season's competition we're going to extend the closing date for voting until November 18," he said.
The People's Choice Award winner will receive a prize and a place in the Fish Hall-of-Fame for permanent display within the city.
The painted fish and voting forms are at Penney's Souvenirs, Sole Outlet, City Focus, Monkey Kids, McLeod's Booksellers, Me and Moo Moo, Visitor Information Centre & i-SITE, Arts Village, Art Expo Gallery, Library Cafe, Hamill's and Absokiwilutely.