Season the salmon fillet evenly with sea salt, black pepper, and garlic powder on both sides.
Heat the sesame oil in a medium non-stick skillet over medium-high heat until shimmering.
Place the salmon in the skillet skin-side up and sear for 4 to 5 minutes until a golden crust forms.
While the salmon cooks, whisk together the tamari, rice vinegar, and freshly grated ginger in a small bowl.
Flip the salmon and pour the ginger-tamari mixture into the pan, allowing it to bubble and thicken into a glaze for 3 minutes.
Assemble the bowl by placing the warm cooked brown rice at the base.
Arrange the sliced cucumber, radishes, and shelled edamame over the rice.
Place the glazed salmon on top, drizzle with any remaining pan sauce, and garnish with sesame seeds.