沪指小幅低开，水产概念走强

Group 1 - The cross-border payment sector opened high, with Zhongyou Capital hitting the daily limit, Sifang Jingchuang rising over 8%, and companies like Cuiwei Co., Zhongyi Technology, and Lakala also opening high [3]. - The A-share market opened with the Shanghai Composite Index down 0.08%, the Shenzhen Component Index up 0.07%, and the ChiNext Index up 0.41% [4]. - The market showed varied performance, with sectors such as aquatic products, marine economy, and diversified finance leading in gains, while non-ferrous metals, public transportation, internet, electricity, and software services sectors faced declines [5]. Group 2 - The Hong Kong stock market opened with the Hang Seng Index down 0.12%, while the Hang Seng Tech Index rose by 0.21%. Sectors like brain-machine interfaces and innovative pharmaceuticals showed strength [6].