The Netherlands and China posted world best times to win gold in the men's and women's quad sculls races.
China clinched the women's quad sculls in 6:05.13, more than six seconds ahead of silver medallists Poland and bronze winners Australia.
On the men's side, the Netherlands won gold -- one of four medals they picked up during the day's competition -- in 5:32.03, 1.72 seconds ahead of Britain's crew, with Australia claiming bronze.