vörösvértestén
Vörösvértestén, also known as "red blood cell stone" or *erythroclast* in scientific terminology, is a rare and poorly understood phenomenon observed primarily in certain species of freshwater fish, particularly in the Danube River basin. The term originates from Hungarian, where *vörösvér* means "red blood" and *tészté* refers to a dough-like or gelatinous substance, describing the appearance of the affected tissue.
This condition is characterized by the formation of dense, gelatinous masses within the fish's blood vessels
Vörösvértestén has been documented in species like the Danube bleak (*Alburnus alburnus*) and other cyprinid fish.
The condition has gained attention in scientific and conservation circles due to its potential as a bioindicator