To make the vinaigrette, in a small bowl, whisk together the olive oil and the citrus juices. Whisk in the pepper and the salt to taste, Set aside.

Working with 1 orange at a time, cut a thin slice off the top and bottom to reveal the flesh, Stand the orange upright and remove the peel in wide strips, cutting downward and following the contour of the fruit. Holding the orange over a bowl, cut along both sides of each segment, releasing the segments from the membrane and allowing them to drop into the bowl. Using the knife tip, pry out any seeds from the segments. Squeeze the membrane over the bowl to collect extra juice that you can add to the vinaigrette at serving time.

Place the fennel in a bowl, add half of the vinaigrette, and toss to coat evenly. Divide the fennel evenly among 8 salad plates, forming a bed on each one, or arrange the fennel in a bed on a large platter.

In a saucepan, bring the wine to a simmer over medium heat. Add the shrimp and cook gently until they turn pink and are cooked through, about 4 minutes. Do not overcook or they will be tough. Using a slotted spoon, transfer the shrimp to a bowl. Add the scallops to the pan and simmer gently until just opaque throughout, about 2 minutes. Transfer with the slotted spoon to the bowl holding the shrimp. Add the squid to the pan and cook until they turn opaque, about 1 minute. Scoop out with the slotted spoon and add to the shrimp and scallops. Drizzle about one-third of the remaining vinaigrette over the seafood and toss to coat everly.

Using the slotted spoon, remove the orange segments from the bowl and distribute evenly over the fennel. Then distribute the warm seafood evenly over the fennel. Add the orange juice from the bowl to taste to the remaining vinaigrette and drizzle the vinaigrette over the salad. Top with the parsley. Serve warm or at room temperature.