A bottlenose dolphin was brought ashore dead in Monmouth County early Sunday morning after a boater spotted it floating in the ocean overnight. Volunteers from the Marine Mammal Stranding Center in Brigantine drove to Long Branch Sunday morning to assess the carcass, said its director, Sheila Dean. More information about the animal would likely be available Monday, she said. The nonprofit marine life organization has responded to 12 other bottlenose dolphin strandings this year, according to data available on its website. One was found dead in Spring Lake last weekend, the data shows. Paul Mar…