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Police told the Otago Daily Times about 5pm that the search had been suspended for the day and efforts would resume tomorrow morning.
"Unfortunately, due to the amount of time that has passed, we are now searching for a body," Sergeant Nathan White, Otago Coastal SAR Coordinator said
"It has been an unsuccessful day of searching in testing conditions, but from the outset of this operation the dedication and determination of volunteers from Surf Life Saving NZ and LandSAR, while covering vast lengths of coastline, gives me confidence that we're doing everything we can to recover the missing teenager."
A shoreline search will begin around 7am tomorrow.
Police have been working with Surf Life Saving New Zealand, LandSAR and MarineSAR to locate the teenager, who on Thursday jumped into the water from a cliff at Second Beach, near St Clair, and did not return to shore.
The search extended further south yesterday, between Second Beach and Tunnel Beach, and included a drone, a dive squad and inflatable rescue boats (IRBs).
Otago Surf Life Saving search and rescue co-ordinator Max Corboy said six IRBs, with four snorkelers aboard, swept the coast from Second Beach to Black Head yesterday as the search area expanded.
"We’re really hopeful and we really want to get a result for the family so they can have closure."
The closure applied to the gathering of seafood, and recreational activities such as surfing and fishing.
A shoreline search was completed yesterday morning, and the police dive squad was called.
The initial search began at 4.30pm on Thursday after police received reports of a male in trouble in the water.
Police continued the search until 9pm that day, with the assistance of Surf Life Saving New Zealand.
An Otago Regional Rescue Helicopter assisted initially but was stood down; it was not called yesterday.