* SSEC -0.1 pct, CSI300 -0.2 pct, HSI flat
* Hang Seng China Enterprises index down 0.2 pct
* New U.S. tariffs on $200bn of Chinese imports could come this week
SHANGHAI, Sept 4 (Reuters) - China's stock markets extended losses on Tuesday, with investors concerned over slowing growth at home and the U.S. set to impose fresh tariffs on $200 billion worth of Chinese imports as early as this week.
** At the mid-day break, the Shanghai Composite index was down 1.55 points or 0.1 percent at 2,719.19, extending losses from five consecutive negative sessions.
** China's blue-chip CSI300 index was down 0.16 percent, with its financial sector sub-index lower by 0.17 percent, the consumer staples sector down 0.13 percent, the real estate index down 0.37 percent and the healthcare sub-index down 0.73 percent.
** Chinese H-shares listed in Hong Kong fell 0.21 percent to 10,790.65, while the Hang Seng Index was flat at 27,721.21.
** China reported another outbreak of deadly African swine fever late on Monday, its third new case in two days, as the highly contagious disease spreads rapidly through the world's top pork producer.
** Manufacturing activity took a hit from weak orders in August, surveys showed, a sign firms are feeling the pinch from an intensifying trade war between the United States and China that could derail global growth.
** Shenzhen-listed shares of construction equipment maker Zoomlion were flat after hitting more-than-nine-year lows on Monday after posting a 23.6 percent drop in first-half profit.
** The smaller Shenzhen index was unchanged for the day and the start-up board ChiNext Composite index was weaker by 0.55 percent.
** Around the region, MSCI's Asia ex-Japan stock index was weaker by 0.26 percent while Japan's Nikkei index was down 0.14 percent .
** The yuan was quoted at 6.8221 per U.S. dollar, 0.02 percent firmer than the previous close of 6.8235.
** The largest percentage gainers in the main Shanghai Composite index were Ningxia Xinri Hengli Steel Wire Rope Co Ltd , up 10.06 percent, followed by ADD Industry Zhejiang Co Ltd, gaining 10.02 percent and Milkyway Chemical Supply Chain Service Co Ltd, up by 10.01 percent.
** The largest percentage losses in the Shanghai index were Yifeng Pharmacy Chain Co Ltd, down 5.35 percent, followed by Harbin Gong Da High-Tech Enterprise Development Co Ltd, losing 5.03 percent and LBX Pharmacy Chain JSC , down by 4.33 percent.
** So far this year, the Shanghai stock index is down 17.73 percent, while China's H-share index is down 7.6 percent. Shanghai stocks have declined 0.17 percent this month.
** The top gainers among H-shares were China Gas Holdings Ltd , up 2.04 percent, followed by China Vanke Co Ltd , gaining 1.34 percent and Tencent Holdings Ltd , up by 1.27 percent.
** The three biggest H-shares percentage decliners were New China Life Insurance Co Ltd, which has fallen 2.55 percent, Huatai Securities Co Ltd, down 1.6 percent and Shenzhou International Group Holdings Ltd, down by 1.6 percent.
** About 4.89 billion shares have traded so far on the Shanghai exchange, roughly 37.6 percent of the market's 30-day moving average of 13.02 billion shares a day. The volume traded was 10.22 billion as of the last full trading day.
** As of 04:15 GMT, China's A-shares were trading at a premium of 18.28 percent over the Hong Kong-listed H-shares.
** The Shanghai stock index is below its 50-day moving average and below its 200-day moving average.
** The price-to-earnings ratio of the Shanghai index was 11.49 as of the last full trading day, while the dividend yield was 2.7 percent.
** So far this week, the market capitalisation of the Shanghai stock index has fallen by 0.17 percent to 28.97 trillion yuan.
** In Hong Kong, the sub-index of the Hang Seng index tracking energy shares dipped 0.2 percent while the IT sector rose 1.3 percent. The top gainer on Hang Seng was CK Asset Holdings Ltd, up 3.42 percent, while the biggest loser was WH Group Ltd, which was down 1.48 percent.
(Reporting by Andrew Galbraith; Editing by Sunil Nair)