Place fish in a shallow dish

Whisk together orange zest, orange juice, olive oil and 2 teaspoons tarragon

Pour over fish, turning to coat

Marinate in refrigerator for 1 hour

Preheat oven to 425 degrees

In a small dish combine mustard, melted butter and honey

In another dish combine breadcrumbs, pecans, parsley and remaining 2 teaspoons tarragon

Remove salmon from marinade and arrange on a parchment lined baking sheet

Brush with mustard mixture and coat with crumb mixture, pressing crumbs gently to coat

Bake for 12 to 16 minutes or until fish is cooked.