Chinese mobile game developer and platform maker CocoaChina today revealed that its flagship franchise Fishing Joy is now generating $6.28 million per month in revenue worldwide, with more than 10 million daily active users (DAU), doubling its monthly revenue in two months.

CocoaChina attributes the game’s success to continued optimization and the rapid growth of the Chinese smartphone user base. The company also increased the game’s reach by reducing the game’s package size, making it more attractive to users with limited bandwidth and data plans.

Last month, the company’s U.S. general manager Lei Zhang told Inside Mobile Apps that Fishing Joy 2 (responsible for the vast majority of the revenue) was generating $4 million in gross revenue as of February.

Inside Mobile Apps also talked to CocoaChina in Nov. 2012 about the company’s strategy for the Chinese market. Zhang attributed Fishing Joy 2’s success to his company’s broad distribution strategy, a stringent anti-piracy policy, and most importantly, access to carrier billing. Back then Fishing Joy 2 was pulling in $1.6 million a month from the Chinese Android market.

Fishing Joy’s 10 million DAU is nothing to sneeze at as well. Monthly active users (MAU) and DAU figures are generally kept close to the vest by mobile game developers. For comparison, Electronic Arts’ hit resource management game The Simpsons: Tapped Out was said to have reached 2.8 million DAU after the title was ranked No. 1 on the iOS top grossing apps charts in October 2012.

Inside Mobile App also recently reported on CocoaChina’s high profile hire of Kai Zhao as its U.S. VP of Engineering and its plans to launch a social gaming platform in 2013.