Party with the fishes this Halloween season at the Florida Aquarium while raising funds for its marine science education program. For adults, the 10th annual Nauti-Night Costume Bash invites guests to don their best disguises and vie for a $1,000 cash prize for "Most Original Costume." The price of admission includes live entertainment, steak and shrimp skewers from Polo Tropical, beer, wine and other beverages (no jail-bait, please; this is a 21-and-up event). The younger set can safely trick-o-treat at Guppyween and see the Aquarium transformed into a haunted mansion with more than 20 trick-or-treat stations scattered throughout the exhibits and Explore-A-Shore, the outdoor children's play pavilion. Nauti-Night, Fri., Oct. 26, 8 p.m.-midnight, $50 general in advance/$60 day of/$45 Aquarium members, and Guppyween, Sun., Oct. 28, 4-9 p.m., $12 ages 12 and over (kids in costume enter for free), The Florida Aquarium, 701 Channelside Drive, Tampa, 813-273-4000, flaquarium.org.