The Big A casino is taking a big bite out of Connecticut gambling resorts.

Mohegan Sun Tribal casino reports that revenues from its slot parlors and table games have plummeted — and blamed competition from the new Aqueduct Resorts World rival.

Table-game revenues dropped 8.7 percent and slot business fell 8.4 percent from a year ago at Mohegan.

Mohegan Sun officials said they were caught by surprise by the popularity of the electronic table games at Aqueduct — such as baccarat and sic bo — which have cut into business at its traditional table games with live dealers.

“Our table games are being impacted more by Aqueduct than anticipated. The location appears to be offsetting the fact that these are not ‘live’ table games,’’ said Mohegan CEO Mitchell Etess.

Its own marketing analysis finds that some New York gamblers are going to Aqueduct rather than taking the trek to Mohegan. Aqueduct opened in October 2011.

Aqueduct Resorts World declined comment.