White Fish Risotto

Name: White Fish Risotto
Ingredients: 6 cups low-sodium chicken broth; 16 ounces bottled clam juice; 2/3 cup fresh orange juice (2 oranges); 5 thyme sprigs; 2 tablespoons chopped mint, plus leaves for garnish; 2 pounds skinless cod fillets, about 1 inch thick; Kosher salt; Pepper; 2 tablespoons unsalted butter; 1 tablespoon extra-virgin olive oil; 1 small yellow onion, minced; 1 garlic clove, minced; 1 1/4 cups arborio rice; 1 cup fresh or thawed frozen peas; 5 medium radishes, thinly sliced (1/2 cup)