The Blue Mirror Clouser Size 4 is an excellent, weighted saltwater baitfish fly with blue reflective flash. Its Clouser-style construction swims hook-point-up and produces a darting, jigging action that can suggest sandeels and other small marine prey.
Fish it on an intermediate or sinking line with firm strips and pauses. Adjust the countdown before retrieving to search the water column, and rinse the hook and materials in fresh water after every saltwater session. The sort of effective fly that can quickly earn a permanent place in the box.