Place fish, lemon juice, dill, cayenne pepper and black pepper to taste in a bowl

Toss to combine and set aside to marinate for 40 minutes

Make pasta and cook until al dente

Drain and rinse thoroughly

Place in a large mixing bowl and set aside to cool thoroughly

Steam or microwave zucchini, carrots and celery separately for 2-3 minutes or until just tender

Refresh under cold running water and set aside to cool completely

Drain fish and place fish, fettuccine, zucchini, carrots and celery in a large salad bowl

To make dressing, whisk together mustard, dill, lemon juice, oil and black pepper to taste in small bowl

Pour dressing over salad and toss gently

Serve immediately.