Preheat oven to 350 degrees, fold a large piece of parchment paper(about 15'by 16') in half to crease, open and lay it flat.
On one side of crease, mound zucchini, top with shallot,olive oil, and lemon slice. Season with salt and pepper. Place salmon on top; drizzle with lemon juice and season with salt and pepper
To close, fold parchment over salmon; make small overlapping pleats to seal the open sides and create a half moon shaped packet. Place n a rimmed baking sheet; Bake until salmon is opaque though out, 15 to 17 minutes.