Rinse fish and pat dry; cut lengthwise into 1/4-inch-thick strips, then stack two or three at a time and cut into pieces 1 to 1 1/2 inches long. Place in a bowl. Pour lime juice over fish and mix.
In a 1 1/2- to 2-quart pan over high heat, bring pineapple juice, coconut milk, onion, and garlic to a boil; cook 2 minutes. Stir in fish mixture and remove from heat. Let cool about 5 minutes, stirring occasionally, then chill until cold, at least 40 minutes, or up to 4 hours, stirring occasionally.
Stir in cilantro and add hot sauce and salt to taste. Spoon equal portions into martini or wine glasses or small bowls. Garnish with a generous spoonful of Pineapple Salsa. Serve with taro chips if desired.
Nutritional analysis per serving without salsa.