More than 1,600 box jellyfish were counted Monday morning, as of 1:30 p.m., according to the city's Ocean Safety & Lifeguard Services Division.
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City officials say University of Hawaii researchers did part of the count in Waikiki before Ocean Safety officials came on duty.
There were also about 125 jellyfish stings in Waikiki, which lifeguard treated with vinegar and hot and cold packs. Paramedics were not needed.
About 40 box jellyfish were counted at Makaha and another 10 at Ala Moana.
Box jellyfish signs are posted in those areas. Entering the waters will expose you to box jellyfish stings, according to city offciials.
Seek medical attention if you experience difficulty breathing.
City officials expect the numbers of jellyfish to drop significantly by Tuesday.
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