... have been investigated. Viability Health and Environment in Aquaculture 285.2 Avoidance of infective period If actinospore emergence occurs only in a certain time of the year, rearing fish ... stages into the intestinal epithelium, several factors are involved in the progression of the disease (Quiroga et al., 2006). One of the most Health and Environment in Aquaculture 18Actinospore ... e.g., Echinactinomyxon, Raabeia, Triactinomyxon, Pseudotriactinomyxon, Hexactinomyxon, Ormieractinomyxon, Siedleckiella, Synactinomyxon, Antoactinomyxon, Hungactinomyxon and Unicapsulactinomyxon....