Seven Long Island-based startups made their case to a panel of investor judges at Adelphi University’s first “Pitch Island” event, with businesses ranging from wedding budget planners to clean energy technologies taking the stage.

The event, billed as a “shark tank” for local early-stage companies, gave entrepreneurs seeking up to $500,000 the opportunity to introduce their companies to a crowd inside Adelphi’s Performing Arts Center in Garden City Saturday afternoon.

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“You can make good money and you can start companies on Long Island,” said Peter Goldsmith, president and founder of LISTnet, a not-for-profit promoter of Long Island’s technology industry. “You don’t have to go to New York City.”

The afternoon event was a product of a public-private initiative involving Nassau County and local tech leaders. Startups had seven minutes to pitch their businesses and three minutes to answer questions from investors.

The companies seeking investment included: BattleShop, a competitive online shopping game; ChromaFish, a test kit and smartphone app that allows fish owners to better manage tanks; urSwim, a private swimming lesson service; MarryMapp, an online tool to manage wedding budgets; Brimes Energy, an engineering firm working on a device for harvesting energy from ocean waves; SwiMART, a wearable device for monitoring swimming performance; and eGifter, a software company specializing in online gift exchanges.

The event didn’t disclose whether participating startups received funding.