It’s a sure sign that Memorial Day weekend is fast approaching.

The first reported white shark attack on a seal of the season was confirmed off Massachusetts over the weekend.

The aftermath of the shark predation incident was captured by the Nantucket Current — on the west end of Nantucket, at Smith’s Point in Madaket.

The shark attack on a seal was recorded on the Atlantic White Shark Conservancy’s Sharktivity app.

“1st of the season,” the Sharktivity app post reads.

The white shark was estimated to be between 7- and 9-feet long.

“This is the time of year that white shark activity starts to pick up,” shark researcher John Chisholm posted about the incident. “If you have a sighting or witness a predation, please use the @sharktivity app to let us know.”

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Meanwhile last week, several basking sharks were seen off Plymouth. Chisholm was alerted to the site, and he counted at least five basking sharks close to the beach.

Basking sharks are up to 30 feet long, and they filter feed on plankton.

The slow-moving sharks — which are often mistaken for great white sharks — have been spotted on some recent whale watches across the region.

“Both white sharks and basking sharks are off Massachusetts now,” Chisholm posted. “Here’s a cheat sheet on how to tell them apart. Remember, if you see a white shark please use the @sharktivity app to report it.”

Chisholm every spring receives many shark reports that turned out to be basking sharks, instead of great white sharks.

They’re often mistaken for white sharks given their similar proportions.

White sharks have a pointed dorsal fin, while basking sharks have a rounded fin. Also, white sharks have two-tone coloration, and basking sharks have uniform coloration.

Another main difference is that white sharks have large gill slits, while basking sharks have extra large gill slits.

Chisholm continues to remind people who see a white shark to report it on the Atlantic White Shark Conservancy’s Sharktivity app.