There are no records of shark attacks here in Panama, or at least not that I know of. Although, there are sharks in both the Pacific Ocean and the Caribbean Sea, that is for sure, shark attacks such as are reported in places such as Florida do not happen here.
There is, however, a season when jellyfish is abundant in the waters of Panama and everybody knows that it usually starts around March and goes for 20 days or so. The people who live in condominiums near the ocean receive a memo telling them not to go swimming at the beach or to look carefully at the sand because the jellyfish sometimes wash ashore, too. They also post the same memo on the elevators so everyone is informed.