Begin filling 4 individual serving bowls starting with a scoop of cooked rice. Arrange vegetables on top, fanning each serving with a couple slices of avocado. Using slotted spoon, scoop diced fish from marinade and divide evenly over vegetables. Drizzle with remaining sauce. Garnish with lime wedges, cilantro, and sesame seeds, if using, and serve immediately. Optional finishing note: top each bowl with strips of nori and pickled ginger for balanced flavors.