A day after being sold to a large publicly traded food company, Sea Cliff-based Pirate Brands LLC, a natural food business known for its Pirate's Booty line of snacks, said in a filing with the state that it will lay off all 55 employees from its Long Island headquarters by October.

The notice, filed with the state Labor Department Tuesday, listed the reason for the layoffs as economic, and noted that the office would be closing. State law requires employers with more than 50 full-time employees to file notice 90 days before layoffs.

Pirate Brands agreed last month to be purchased by Parsippany, N.J.-based B&G Foods Inc. for $195 million in cash. The deal closed Monday.

Neither B&G or Pirate Brands returned requests for comment.

In a conference call announcing the acquisition agreement last month, B&G chief executive David Wenner said he planned to integrate sales and administrative duties as well as the distribution systems of Pirate Brands and B&G after the deal closed.

B&G, which had a stock market value of $1.8 billion at the end of the trading Wednesday, entered the snack foods market in October through a string of acquisitions. In the past year, the company has bought several other snack brands, including Old London and TrueNorth.

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Its other brands include Ac'cent seasonings, B&M baked beans and Cream of Wheat.

Wenner said Pirate Brands' business has experienced double-digit growth in recent years, and he saw further opportunities in expanding the snacks' flavor varieties.

Pirate Brands, which also sells the Smart Puffs and Original Tings snacks, formerly operated as Robert's American Gourmet Food LLC.