Bring a large pot of salted water to a boil and cook the whole wheat linguine until al dente, usually about 8-9 minutes.
While the pasta cooks, heat the ghee and extra virgin olive oil in a large skillet over medium heat until shimmering.
Add the minced garlic and red pepper flakes to the skillet, sautéing for 1 minute until the garlic is fragrant but not browned.
Increase the heat to medium-high and add the shrimp in a single layer, seasoning them with sea salt and black pepper.
Cook the shrimp for 2 minutes per side until they turn pink and opaque, then add the thinly sliced zucchini to the pan.
Toss the zucchini with the shrimp for 2 minutes until just tender, then pour in the fresh lemon juice to deglaze the pan.
Drain the linguine, reserving a small splash of pasta water, and add the noodles directly into the skillet.
Toss everything together to coat the noodles in the garlic butter sauce, adding a bit of reserved pasta water if needed for silkiness.
Remove the skillet from the heat and garnish with a generous amount of chopped fresh parsley before serving immediately.