Flesh turns opaque throughout
Flesh flakes easily with a fork
Center is just barely translucent or fully opaque, depending on preference
Internal temperature reaches 125°F to 130°F for medium-rare
Internal temperature reaches 135°F to 145°F for medium to well-done
Surface is lightly browned or seared if pan-cooked
Juice runs clear, not raw-looking
Flesh separates easily along the natural lines of the fish