A man from Quebec has died following a boat explosion at a South Florida marina this week that also injured six people, officials say.

The explosion was Monday and the man has been identified as Sebastien Gauthier, 41, said Arielle Callender, a spokesperson for the Florida Fish and Wildlife Conservation Commission (FWC), in a statement to CBC News.

Gauthier was among seven passengers aboard a 37-foot [11.3-metre] vessel at the Lauderdale Marina in Fort Lauderdale.

According to preliminary information, the vessel exploded after its engines were started, said Callender.

The six other passengers were rushed to hospital for treatment.

Callender said an investigation by the FWC is ongoing. 

"Our deepest condolences to the family and friends of Mr. Gauthier during this difficult time," she wrote.