Fresh Wild Pacific Coho Salmon and Corn Chowder

1 tablespoon butter

1 tablespoon vegetable oil

1 cup diced celery hearts

½ red onion

diced

1 carrot

peeled and diced

1 small sweet red bell pepper

chopped

1 small sweet yellow bell pepper

chopped

3 Yukon Gold potatoes

peeled and diced

or more to taste

2 cups fish stock

2 (8 ounce) bottles clam juice

2 earscorn

removed from cob

1 pound coho salmon - skinned

boned

and chopped into 1-inch pieces

1 cup heavy whipping cream

3 tablespoons chopped fresh dill

2 tablespoons chopped fresh thyme

1 teaspoon chopped fresh tarragon

kosher salt and ground black pepper to taste

1 pinch chopped fresh parsley