(Yicai Global) Oct. 30 -- China's mainland stock markets were mostly down by midday while growth stocks performed better than main indexes.

The Shanghai Composite Index slid 0.10 percent to 3,269.45 by noon. The Star Market Board 50 Index, or Star 50, climbed 0.25 percent to 1,361.65 after losing nearly 1 percent earlier.

The Shenzhen Component Index declined 0.42 percent to 13,463.32. The ChiNext Price Index, which tracks growth enterprises in Shenzhen, was down 0.09 percent to 2,697.91.

Editor: Emmi Laine