French ace Roussel sank his teeth into Sharks' defenseman Marc-Edouard Vlasic during a scuffle at the end of Vancouver's 4-0 defeat to San Jose on Friday.
The NHL's department of player safety said in a statement the $5,000 fine on Roussel was the maximum allowable under present regulations.
A video of the clash saw Canadian Olympic gold medallist Vlasic react furiously after his tussle with Roussel in the final moments of the defeat.
Roussel received cross-checking and roughing minor penalties and a 10-minute misconduct penalty.
Roussel has a chequered disciplinary record and was suspended for two games in 2015 for a cross-check. He was also fined for sucker-punching an opponent earlier that season.
The 29-year-old, who started his NHL career with the Dallas Stars, signed a four-year $12 million contract with Vancouver in July.