Given the likelihood of increased boating activity over the July Fourth holiday weekend, the state Department of Environmental Conservation is temporarily suspending shellfish harvesting in three areas along the North Shore.

Discharges from boat toilets can contaminate shellfish, making it unsafe for people to eat, the DEC said.

Boaters are reminded that the discharge of treated or untreated sewage is prohibited in all of Oyster Bay Harbor, Port Jefferson Harbor and the Sand Hole, which include the areas where shellfish harvesting is suspended starting Saturday at sunrise.

Specifics of the closures can be found on the DEC’s 24-hour recorded message line at 631-444-0480.

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The ban is expected to be lifted on Thursday.

As a precautionary measure since 1995, these areas have been “temporarily uncertified” for shellfish harvesting on both the Fourth of July and Labor Day weekends.