Perfectly cooked steamed fish is opaque throughout, flakes easily with a fork, and reaches an internal temperature of 145°F (63°C).
Determining the doneness of steamed fish involves a combination of visual cues, texture assessment, and, ideally, temperature measurement. Here's a breakdown:
Visual Inspection: Raw fish is translucent. As it cooks, the proteins coagulate, causing the flesh to become opaque. Look for a consistent opacity throughout the fillet. If any part still appears glassy or translucent, it needs more steaming.
Flake Test: Gently insert a fork into the thickest part of the fish at a 45-degree angle. Twist the fork gently. If the fish is cooked, it will easily separate into flakes. If it resists flaking or appears rubbery, it's not done yet.
Internal Temperature: The most accurate way to ensure doneness is to use a food thermometer. Insert the thermometer into the thickest part of the fish. The internal temperature should reach 145°F (63°C). This is the recommended safe internal temperature for fish according to food safety guidelines.
Moisture: Perfectly steamed fish should be moist and tender. Overcooked fish will be dry and tough.
Use a thin, flexible fish spatula to gently lift the cooked fish from the steamer basket. This will prevent the delicate flesh from breaking apart.