Jin yu 金鱼 (goldfish) in Chinese is pronounced the same as jin 金 (gold) and yu 玉 (jade), therefore can be used as a pun referring wealth.

Related Pun Picture:

May your household be piled high with gold and jade 金玉满堂

• Fig 1-2. porcelain vase, Qianlong period (1736 – 96), Qing dynasty, courtesy of the National Palace Museum, Taipei

  Fig 3. close-up from porcelain basin, Xianfeng period (1850 – 61), Qing dynasty, courtesy of the National Museum of China, Beijing