Unfortunately, this type of bait is rare in shops. However, now it is available! This bait has many realistic elements such as legs, tail fibers and even semblance of tracheal gills.
It is a collective image of insect larvae without exact simulation. Common Alien silhouette looks like larvae of damselflies, delicious for different fishes. So you can expect to catch not only the usual pike and perch. You should realize that it is an imitation of larvae.
It is better to equip bait with light weight. Passing should be followed with pauses and suspending. However, traditional methods of passive bait animation give excellent results.