Pat the salmon fillet dry with paper towels and season both sides with sea salt and black pepper.
Dice the strawberries, blueberries, raspberries, and avocado into small, uniform pieces.
In a small bowl, combine the berries, avocado, lime juice, and chopped cilantro to create the salsa.
Heat avocado oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon skin-side down in the pan and sear for 4-5 minutes until the skin is crispy and golden.
Carefully flip the fillet and cook for another 3-4 minutes until the salmon is opaque and flakes easily with a fork.
Remove the salmon from the heat and let it rest for 2 minutes to lock in the juices.
Plate the salmon and top with a generous portion of the chilled berry salsa before serving.