Vorticella, a ciliate protozoan evidenced by a conspicuous ring of hair-like stalks found in clusters but attaching independently to the rostrum and appendages.
It is a bell-shaped or cylindrical organism with a conspicuous ring of cilia (hairlike processes) on the oral end and a contractile unbranched stalk on the aboral end. Vorticellas reproduce by longitudinal fission.
Ellobiopsis sp. appears as green, elliptical to elongate cylindrical stalks penetrating into the body of the shrimp. This pest can affect motility and breeding, which often leads to secondary bacterial infections evidenced by opacity and whitening of the body of the shrimp and usually leading to mortality.