Alx (Lice & Anchor worm) by eSHa eSHa alx is specially developed for ornamental fish against parasitic species of Crustacea (Maxillopoda) such as Argulus (carp lice) Lernaea (anchor worm) Ergasilus (gill lice) Salmincola (gill lice) etc. The parasitic Crustacea occur on and in the skin of fish and on the gills.