Hawai’i Ocean Observing System’s series of public talks highlights what UH-Manoa researchers are learning about Hawai’i’s waters. Talks are at 6 p.m. every second Wednesday at Outrigger Waikiki on the Beach. www.hioos.org. Free. Validated parking is $5. ph: 923-0711.

“Tracking Tuna and Sharks Around Hawai’i and the Pacific,” Kim Holland, researcher, Hawai’i Institute of Marine Biology, UH-Manoa.