A newly elected leader of Tokyo has postponed a plan to relocate the world's biggest fish market, one of the city's most famous landmarks.

Gov. Yuriko Koike announced Wednesday that she would decide on a date only after an environmental assessment of the new site is completed in January. The move had been scheduled to take place in early November.

The current Tsukiji fish market is to be moved to the site of a former gas plant in Toyosu, a reclaimed area in Tokyo Bay, and there are concerns about soil contamination.

Koike, who was elected last month, also questioned the relocation cost of 580 billion yen ($ 5.7 billion). Construction costs alone have nearly tripled from the original estimate to 275 billion yen ($2.7 billion).