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Distribution of Tubifex tubifex lineages and Myxobolus cerebralis infection in the tailwater of the San Juan River, New Mexico

Journal of Aquatic Animal Health

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DOI: 10.1577/H04-018.1

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Abstract

We chose a hypolimnetic-release tailwater of the San Juan River, New Mexico, to characterize the etiology of whirling disease, a parasitic infection of salmonids. We sampled a 2-km reach of the tailwater in August and December 2001 and June 2002 to characterize environmental factors influencing the distribution and density of Tubifex tubifex lineages and Myxobolus cerebralis infection rates. Shortly after the scouring flow, organic matter in sediments and T. tubifex densities increased within deep habitats. In contrast, no differences were observed in T. tubifex densities and organic matter collected from shallow habitats throughout the three sampling dates. Within this study area, we found three sympatric lineages of T. tubifex (lineages I, III, and VI). Lineage VI dominated riffle reaches, whereas lineages I, III, and VI were observed in pool habitats. Myxobolus cerebralis infection rates were higher in T. tubifex collected in pool habitats (3.01%) than in those collected in riffle habitats (0.51%). Only lineage III exhibited infection with M. cerebralis. We suggest that the habitat and genotype of T. tubifex are important in characterizing prevalence of disease within the San Juan River tailwater. Scouring flow may have a beneficial effect on disease severity in salmonid hosts by reducing organic loading and hence T. tubifex abundance in deep habitats.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Distribution of Tubifex tubifex lineages and Myxobolus cerebralis infection in the tailwater of the San Juan River, New Mexico
Series title:
Journal of Aquatic Animal Health
DOI:
10.1577/H04-018.1
Volume
16
Issue:
4
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Aquatic Animal Health
First page:
179
Last page:
185
Number of Pages:
7