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Diseases of Aquatic Organisms

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DAO 121:37-47 (2016)  -  DOI:

Accelerated deactivation of Myxobolus cerebralis myxospores by susceptible and non-susceptible Tubifex tubifex

R. Barry Nehring1,*, George J. Schisler2, Luciano Chiaramonte3, Annie Horton1, Barbara Poole1

1Colorado Division of Parks and Wildlife, 2300 South Townsend Avenue, Montrose, Colorado 81401, USA
2Colorado Division of Parks and Wildlife, 317 West Prospect Street, Fort Collins, Colorado 80526, USA
3Idaho Department of Fish and Game, 1800 Trout Road, Eagle, Idaho 83616, USA
*Corresponding author:

ABSTRACT: In the 1990s, the Tubifex tubifex aquatic oligochaete species complex was parsed into 6 separate lineages differing in susceptibility to Myxobolus cerebralis, the myxozoan parasite that can cause whirling disease (WD). Lineage III T. tubifex oligochaetes are highly susceptible to M. cerebralis infection. Lineage I, IV, V and VI oligochaetes are highly resistant or refractory to infection and may function as biological filters by deactivating M. cerebralis myxospores. We designed a 2-phased laboratory experiment using triactinomyxon (TAM) production as the response variable to test that hypothesis. A separate study conducted concurrently demonstrated that M. cerebralis myxospores held in sand and water at temperatures ≤15°C degrade rapidly, becoming almost completely non-viable after 180 d. Those results provided the baseline to assess deactivation of M. cerebralis myxospores by replicates of mixed lineage (I, III, V and VI) and refractory lineage (V and VI) oligochaetes. TAM production was zero among 7 of 8 Lineage V and Lineage VI T. tubifex oligochaete groups exposed to 12500 M. cerebralis myxospores for 15, 45, 90 and 135 d. Among 4 mixed lineage exposure groups, TAM production averaged 14641 compared with 2202495 among 12 groups of Lineage III oligochaetes. Among the 6 unexposed Lineage III experimental groups seeded into original Phase 1 substrates for the 45, 90 and 135 d treatments during the Phase 2 portion of the study, TAM production was reduced by 98.9, 99.9 and 99.9%, respectively, compared with the average for the 15 d exposure groups. These results are congruent with the hypothesis that Lineage V and Lineage VI T. tubifex oligochaetes can deactivate and destroy M. cerebralis myxospores.

KEY WORDS: Myxobolus cerebralis · Tubifex tubifex · Myxospore deactivation · Biological filtering

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Cite this article as: Nehring RB, Schisler GJ, Chiaramonte L, Horton A, Poole B (2016) Accelerated deactivation of Myxobolus cerebralis myxospores by susceptible and non-susceptible Tubifex tubifex. Dis Aquat Org 121:37-47.

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