Short Answer:

You know salmon is fully cooked when it flakes easily with a fork, appears opaque throughout, and reaches an internal temperature of 63°C (145°F). The flesh should be firm but still moist, not dry or raw in the center.

Visual cues like color change, texture, and separation of the layers help indicate doneness. Checking with a thermometer ensures accuracy, making the salmon safe to eat while remaining tender and flavorful.

Detailed Explanation:

Determining Doneness of Salmon

Knowing when salmon is fully cooked is essential for achieving a moist, tender, and safe-to-eat fillet. Overcooked salmon becomes dry and tough, while undercooked salmon can be raw or unsafe. Air frying requires careful attention to temperature, time, and visual cues to ensure perfect results.

Visual Cues

1. Color – Fully cooked salmon changes from translucent pink to opaque. The flesh should be uniform in color and no longer shiny or raw-looking in the center.
2. Flaking – Gently press the fish with a fork; fully cooked salmon flakes easily along the natural lines of the muscle fibers. Undercooked salmon resists flaking and may appear mushy.
3. Separation – The layers of the fillet should start to separate slightly, indicating it has reached proper doneness.

Temperature Check

1. Internal Temperature – Using a food thermometer is the most reliable method. Salmon is considered safe to eat when it reaches 63°C (145°F) at the thickest part of the fillet.
2. Placement – Insert the thermometer into the center of the thickest section to avoid false readings from thinner edges.
3. Accuracy – Temperature measurement ensures the salmon is cooked thoroughly without overcooking the exterior.

Texture Assessment

1. Firmness – Fully cooked salmon feels firm to the touch but still gives slightly under gentle pressure.
2. Moisture – Properly cooked salmon retains moisture; overcooked salmon is dry, while undercooked salmon is soft and raw in the center.

Timing Guidelines

1. Air Fryer – At 180–200°C (350–400°F), salmon usually cooks in 8–12 minutes depending on thickness.
2. Thin vs Thick Fillets – Thinner fillets require shorter cooking time; thicker fillets need longer. Monitor closely to avoid overcooking.

Additional Tips

1. Preheating – Preheat the air fryer to promote even cooking.
2. Avoid Overcrowding – Single-layer placement ensures hot air circulates properly, allowing consistent doneness.
3. Resting – Let salmon rest for 2–3 minutes after cooking to allow juices to redistribute, ensuring moist and tender fillets.

Conclusion:

Salmon is fully cooked when it reaches 63°C (145°F), appears opaque, flakes easily, and has a firm yet moist texture. Using a combination of visual, tactile, and temperature checks ensures safety, flavor, and proper texture. Careful timing and handling in an air fryer prevent overcooking while delivering perfectly tender and flavorful salmon every time.