Variation in Infections of<i>Myxobolus cerebralis</i>in Field-Exposed Cutthroat and Rainbow Trout in Idaho

Hiner, M.M.; Moffitt, Christine M.

doi:10.1577/1548-8667(2001)013<0124:viiomc>2.0.co;2

Cited by 29 publications

(22 citation statements)

References 24 publications

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“…Other studies in the Intermountain West have demonstrated the relationship between M. cerebralis infection and stream temperature in the field (Baldwin et al 2000;Hiner and Moffitt 2001;Krueger 2002). However, mean water temperatures during the exposure periods of these studies were 6.2-10.88C.…”

Section: Environmental Aspects Of Myxobolus Cerebralis Infection Riskmentioning

confidence: 90%

“…Recent studies in Idaho and Colorado suggested that a relationship may exist between the abundance of T. tubifex and infection risk in salmonids (Hiner and Moffitt 2001;Nehring and Thompson 2003). Recent studies in Montana showed a significant relationship between the density of infected worms and M. cerebralis infection risk in salmonids (Krueger 2002).…”

Section: Biological Aspects Of Myxobolus Cerebralis Infection Riskmentioning

confidence: 99%

“…The distribution and severity of whirling disease in wild trout populations have been highly variable (Nickum 1999). The risk of infection varies among salmonid species MacConnell and Vincent 2002;Vincent 2002) and strains (Wagner et al 2002;Hedrick et al 2003), salmonid life history strategies (Downing et al 2002;Ryce 2003), T. tubifex genetic clades Beauchamp et al 2002), several environmental factors Hiner and Moffitt 2001), and the interactions among all these parameters (Kerans and Zale 2002). When challenged with triactinomyxons in the laboratory, Yellowstone cutthroat trout appear to be moderately susceptible to whirling disease in comparison to other, highly susceptible species, such as rainbow trout .…”

mentioning

confidence: 99%

“…No previous studies have examined the genetic composition of T. tubifex in Yellowstone National Park, but samples from the Madison River indicated the presence of a clade that is moderately susceptible to the transmission of whirling disease (Kerans et al 2004). Environmental factors that have been most important in influencing M. cerebralis severity in the field have included stream temperature regime (Baldwin et al 2000;Hiner and Moffitt 2001), flow (Vincent 2001), and sediment composition (Krueger 2002).…”

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confidence: 99%

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Myxobolus cerebralis in Native Cutthroat Trout of the Yellowstone Lake Ecosystem

et al. 2006

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Abstract.-The exotic parasite Myxobolus cerebralis was first detected in native adult Yellowstone cutthroat trout Oncorhynchus clarkii bouvierii from Yellowstone Lake in 1998, seriously threatening the ecological integrity of this pristine, naturally functioning ecosystem. We immediately began to assess the prevalence and spatial extent of M. cerebralis infection in Yellowstone cutthroat trout within Yellowstone Lake and to determine the infection risk of age-0 Yellowstone cutthroat trout, the relative abundance and actinospore production of tubificid worms, and the basic environmental characteristics of tributaries. During 1999-2001, juvenile and adult Yellowstone cutthroat trout were infected throughout Yellowstone Lake; the highest prevalence (15.3-16.4%) occurred in the northern and central regions. Exposure studies in 13 streams indicated that Pelican and Clear creeks and the Yellowstone River were positive for M. cerebralis; the highest prevalence (100%) and severity was found in Pelican Creek during mid-July. Sexually mature individuals of the oligochaete Tubifex tubifex were most abundant in early summer, were genetically homogenous, and were members of a lineage known to produce moderate to high levels of M. cerebralis triactinomyxons. Only 20 of the 3,037 sampled tubificids produced actinospores after 7 d in culture, and none of the actinospores were M. cerebralis. However, one non-actinospore-producing T. tubifex from Pelican Creek tested positive for M. cerebralis by polymerase chain reaction. Stream temperatures at Pelican Creek, a fourth-order, low-gradient stream, were over 208C during the first exposure period, suggesting that T. tubifex were capable of producing triactinomyxons at elevated temperatures in the wild. Although the infection of otherwise healthy adult Yellowstone cutthroat trout within Yellowstone Lake suggests some resistance, our sentinel cage exposures indicated that this subspecies may be more susceptible to whirling disease than previous laboratory challenges have indicated, and M. cerebralis may be contributing to a significant recent decline in this population.

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Section: Environmental Aspects Of Myxobolus Cerebralis Infection Riskmentioning

confidence: 90%

Section: Biological Aspects Of Myxobolus Cerebralis Infection Riskmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Myxobolus cerebralis in Native Cutthroat Trout of the Yellowstone Lake Ecosystem

et al. 2006

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“…Some parasites, such as Myxobolus cerebralis, can have deleterious effects on some species but not others (e.g. Hiner & Moffitt 2001, Blazer et al 2004. Consequently, understanding the prevalence and potential effects of parasites on fishes may be important for explaining patterns associated with fish population dynamics and assemblage structure.…”

Section: Introductionmentioning

confidence: 99%

Infection by a black spot-causing species of Uvulifer and associated opercular alterations in fishes from a high-desert stream in Wyoming

Quist

Bower²,

Hubert³

2007

Dis. Aquat. Org.

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Black spot is a common disease syndrome of freshwater fishes. This study provides information on the rank of density of the black spot agent and opercular bone alterations associated with at least one digenean, Uvulifer sp., infecting native and non-native catostomids and cyprinids of the Upper Colorado River Basin. We evaluated the density rank of pigmented metacercariae and associated alterations in the operculum of the bluehead sucker Catostomus discobolus, flannelmouth sucker C. latipinnis, white sucker C. commersoni, catostomid hybrids, roundtail chub Gila robusta, and creek chub Semotilus atromaculatus, sampled from Muddy Creek, Wyoming, USA in 2003 or 2004. All fish species contained individuals that exhibited gross signs of the black spot agent. Bluehead and flannelmouth suckers had 100% prevalence of infection. Although the other suckers and chubs contained encysted metacercariae in at least one individual, the presence of pigmented metacercariae was not apparent (i.e. based on gross observations) in many individuals. Catostomids had higher densities of metacercariae than cyprinids, as shown by frequency distributions of density ranks. Opercular holes (i.e. holes that completely penetrated the opercle and were in direct association with the pigment associated metacercariae) and pockets (depressions on the external surface of the opercle associated with metacercariae) were abundant among catostomids but rare among cyprinids.KEY WORDS: Black spot disease · Uvulifer sp. · Opercular lesions · Colorado River · Native fish Resale or republication not permitted without written consent of the publisherDis Aquat Org 78: [129][130][131][132][133][134][135][136] 2007 mediate host snail and transforms into sporocysts, which in turn produce free-swimming cercariae. Infection occurs when a fish encounters cercariae that penetrate its integument and develop into encysted metacercariae, and the worm undergoes development in the fish before it will mature in the appropriate avian final host. Encysted metacercariae of some species can survive more than 4.5 yr in a fish (Hoffman & Putz 1965). The characteristic black spot is the result of the fish forming a capsule of connective tissue containing melanophores around the encysted metacercaria (Davis 1967, Berra & Au 1978.Many researchers have investigated the effects of encysted metacercariae on fishes, but results have been inconsistent. In the laboratory, heavy infections have been shown to be fatal or to reduce growth in some cases (Hunter & Hunter 1938, Hoffman 1956, Lemly & Esch 1984. In natural systems, results are more variable with some studies showing deleterious effects from heavy infections by black spot agents (Harrison & Hadley 1982, Lemly & Esch 1984, whereas others show little or no effect from the parasite (e.g. Vinikour 1977, Baker & Bulow 1985.During studies of the ecology of fishes in Muddy Creek, Wyoming, we observed the widespread prevalence of metacercariae, with apparent different densities per infected individual among fish species. We ...

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Comparative Epidemiology of Myxozoan Diseases

Fontes

Hallett

2015

Myxozoan Evolution, Ecology and Development

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Variation in Infections ofMyxobolus cerebralisin Field-Exposed Cutthroat and Rainbow Trout in Idaho

Cited by 29 publications

References 24 publications

Myxobolus cerebralis in Native Cutthroat Trout of the Yellowstone Lake Ecosystem

Myxobolus cerebralis in Native Cutthroat Trout of the Yellowstone Lake Ecosystem

Infection by a black spot-causing species of Uvulifer and associated opercular alterations in fishes from a high-desert stream in Wyoming

Comparative Epidemiology of Myxozoan Diseases

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