Beside, the farmers also raised nipper prawn and banana prawn in order to diversity farming species, and make full use of water surface.
Freshwater fish farming in Quang Ninh developed remarkably in the districts of Dong Trieu, Yen Hung, Uong Bi, Hai Ha, Dam Ha, Tien Yen, and Hoanh Bo. Currently, in the province there are 3,175ha of water surface used for freshwater fish farming, including 1,500ha transformed from low-efficient rice cultivating area into aquaculture. Freshwater fish output last year amounted to 5,200MT.
In 2009, nearly 500 households farmed Otter snout clams in an area of more than 300ha, concentrating in the districts of Van Don, Hai Ha, Cam Pha and Ha Long. In Van Don alone, more than 1,000MT of Otter snout clams have been harvested.
The farmers use nearly 500ha of sea water for oyster farming in cage and raft, including 650 cages concentrating in Van Don district, and some other in Ha Long city, and Cam Pha townlet, with an output of around 2,500-3,500kg of oyster per raft.
Beside, Quang Ninh province also has 3,490ha used for farming mollusks such as clam, scallop, and Ben Tre clam with an output of 7,335MT. The production of other farmed mollusk species included 5,565MT of abalone, sea cucumber, sea urchin and snails.
The farming of many high value marine fish such as grouper, yellow sea bream, perch, and black king fish, etc. developed widely in Quang Ninh. In 2009, marine fish farming area occupied more than 1,000ha of water surface in the gulf with 7,375 cages, providing an output of 2,885MT.