Both lineages III and VI cysted at 5☌ but not at 17☌ or 27☌. There was no detectable effect of lineage, infection, or photoperiod on cysting. Lineage VI exhibited significantly higher adult survival, weighed more initially, gained more weight, and had higher natality (production of immature tubificids) than did lineage III regardless of temperature, photoperiod, or infection treatment. cerebralis at all temperatures, whereas lineage III exhibited infection levels of 4.3% at 5☌, 3.3% at 17☌, and 0% at 27☌. Monocultures of lineages III and VI were subjected to infection (0 and 500 myxospores per worm), a range of temperatures (5, 17, and 27☌), and various diurnal photoperiods (12:12, 14:10, and 16:8 dark : light) over a 70-d period by using a split-split plot experimental design.
In addition, the environmental effects on the growth, reproduction, and survival of T. tubifex varies with water temperature however, little is known about the interactive effects of temperature and photoperiod on the susceptibility of T.
Release of the triactinomyxon form of the parasite from T. Tubifex tubifex is the definitive host for Myxobolus cerebralis, the causative agent of whirling disease in salmonid fish.
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