Wash and clean the zucchini, cut them in half lengthwise and cut into thin slices. Peel and finely chop the onion. Wash the fish, dab dry and cut into cubes. Cook pasta in boiling salted water according to package instructions
Heat 2 tablespoons of oil in a coated frying pan. Sauté the fish in it while turning, season with salt and pepper and remove. Clean the pan, heat 2 tbsp. oil in the pan again. Sauté the zucchini in it while turning. Add the onion and fry briefly. Add cream cheese, deglaze with 250 ml water, bring to the boil briefly. Add fish, season with salt, pepper, lemon peel and lemon juice
Drain the pasta, let it drain. Wash basil, dab dry, pluck leaves and chop coarsely except for a little to garnish. Add basil and noodles to the sauce. Arrange on plates and garnish with the remaining basil, sprinkle with freshly ground pepper if desired.