Lymphocystis

Lymphocystis is caused by dsDNA, non-enveloped, iridoviruses, with particles measuring 200 +/- 50 nm, making them among the largest of the Iridoviridae. The iridovirus associated with gilthead sea bream (Sparus aurata) is known as Lymphocystis Disease Virus (LDV).
Pathogen is found in all environments but it is mainly a marine disease.