Geographic distribution of Tetracapsuloides bryosalmonae infected fish in Swiss rivers: an update

Wahli, Thomas; Bernet, Daniel; Steiner, Pascale; Schmidt‐Posthaus, Heike

doi:10.1007/s00027-006-0843-4

Cited by 62 publications

(72 citation statements)

References 28 publications

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“…This vertical transmission capacity should enable T. bryosalmonae to persist indefinitely in the local bryozoan population without the vertebrate host, representing a potentially very effective dispersal strategy for the parasite. On the other hand, highly heterogeneous distributions of T. bryosalmonae at the micro-geographic scale shown here and by others (Wahli et al 2007, Peeler et al 2008 indicate that the realized dispersal ability of the parasite may be much more restricted. In order to evaluate which of the scenarios holds true for T. bryosalmonae, quantification of the relative roles of drift and gene flow among T. bryosalmonae populations using microsatellite or single nucleotide polymorphism markers would be required.…”

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confidence: 42%

Proliferative kidney disease (PKD) agent Tetracapsuloides bryosalmonae in brown trout populations in Estonia

Dash¹,

Vasemägi²

2014

Dis. Aquat. Org.

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Proliferative kidney disease (PKD) caused by the myxozoan parasite Tetracapsuloides bryosalmonae is a serious parasitic disease threatening both farmed and wild salmonid populations, but very little is currently known about the distribution of the parasite in the Baltic Sea region. In this study we (1) report the development of a novel multiplex PCR method for fast and reliable screening of T. bryosalmonae; (2) use this multiplex PCR method to show that the PKD agent T. bryosalmonae is widespread in natural brown trout Salmo trutta L. populations in Estonia; (3) evaluate monthly and yearly variation of T. bryosalmonae prevalence in juvenile trout; (4) assess T. bryosalmonae prevalence in different age-classes of fish (0+ vs. 1+ and older) and report the presence of the PKD agent in the kidneys of returning sea trout spawners; and (5) suggest the freshwater bryozoan Plumatella fungosa as a putative invertebrate host of T. bryo salmonae in Estonia. Our results demonstrate a highly heterogeneous distribution of T. bryosalmonae at the micro-geographic scale, indicating that PKD could have an important negative effect on recruitment in Estonian brown trout populations.KEY WORDS: Tetracapsuloides bryosalmonae · Salmo trutta · Salmonid fish · Natural population · Parasite · Host · Myxozoa · Bryozoa Resale or republication not permitted without written consent of the publisherDis Aquat Org 109: [139][140][141][142][143][144][145][146][147][148] 2014 While the effects of temperature on T. bryosalmonae proliferation and the renal pathological responses of the salmonid host are well documented, considerably less is known about the distribution of the parasite and the severity of PKD in wild salmonid populations (Sterud et al. 2007, Peeler et al. 2008, Kristmundsson et al. 2010, Okamura et al. 2011, Skovgaard & Buchmann 2012. For example, the prevalence of PKD is spatially variable within and among river systems (Feist et al. 2002, Sterud et al. 2007, Wahli et al. 2008, Skovgaard & Buchmann 2012. However, the potential effects of temporal variation, different life history strategies (e.g. migratory vs. resident fish), and juvenile age on T. bryosalmonae prevalence is not known. Yet, such knowledge is necessary for a better understanding of the life cycle and dispersal of T. bryosalmonae, and the epidemiology of PKD.The Baltic Sea catchment contains approximately 1000 anadromous brown trout Salmo trutta L. populations and numerous wild resident brown trout stocks (HELCOM 2011). Very little is currently known about the distribution of the PKD-causing parasite T. bryosalmonae and its bryozoan host(s) in the Baltic Sea region and its potential impact on wild trout populations (Skovgaard & Buchmann 2012). Earlier reports from Estonia documented the occurrence of T. bryosalmonae in Atlantic salmon and brown trout in a few rivers based on histopathological work (Kadakas et al. 2001), but no information is available on the prevalence of T. bryosalmonae among wild anadromous and resident brown trout populations in Eston...

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confidence: 42%

Proliferative kidney disease (PKD) agent Tetracapsuloides bryosalmonae in brown trout populations in Estonia

Dash¹,

Vasemägi²

2014

Dis. Aquat. Org.

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“…Several investigations have noted the presence of T. bryosalmonae infections and discussed the possible connection with decreases in populations of infected fish. In Switzerland, it has been suggested that recent decreases in brown trout populations were caused by PKD (Wahli et al 2002(Wahli et al , 2007. A similar scenario is thought to be the case for Atlantic salmon in Norway (Sterud et al 2007), and (Kristmundsson et al 2010) hypothesize that PKD may play a significant role in the recent decline in Arctic charr populations in Iceland.…”

Section: Effects Of Pkd In Wild Fishesmentioning

confidence: 88%

“…It is clear now from several studies that Tetracapsuloides bryosalmonae is widespread in wild hosts in both Europe and North America and that many wild salmonids suffer from PKD (Wahli et al 2007, Okamura et al 2011. While PKD constitutes a serious problem for freshwater production of salmonids in Europe and North America (Hedrick et al 1993, Okamura et al 2011, the effects of T. bryosalmonae infections on wild fish populations are still debatable.…”

Section: Effects Of Pkd In Wild Fishesmentioning

confidence: 99%

“…Even though a relation between PKD and stock declines of brown trout has been suggested (Wahli et al 2007), mass mortalities due to this disease are rarely observed in wild salmonids with the exception of the observations made by Sterud et al (2007). Recorded cases are typically either subclinical infections or cases with clinical signs, where no mortality could be documented (Wootten & McVicar 1982, Feist & Bucke 1993.…”

Section: Effects Of Pkd In Wild Fishesmentioning

confidence: 99%

“…Yet, the impact of PKD on wild fish is a matter of some uncertainty because the effect of PKD on wild fish populations has not been adequately documented. At some European localities, it has been concluded that PKD is responsible for high mortality in wild brown trout Salmo trutta (Wahli et al 2002(Wahli et al , 2007 and Atlantic salmon S. salar (Sterud et al 2007). Even though this is probable, it is difficult, however, to prove with certainty that PKD is the only cause of the observed mortalities.…”

Section: Introductionmentioning

confidence: 99%

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Tetracapsuloides bryosalmonae and PKD in juvenile wild salmonids in Denmark

Skovgaard¹,

Buchmann²

2012

Dis. Aquat. Org.

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The myxozoan Tetracapsuloides bryosalmonae is the causative agent of proliferative kidney disease (PKD), a widespread and serious condition in salmonid fishes in Europe and North America. In Europe, PKD is primarily reported affecting farmed rainbow trout Oncorhynchus mykiss, but limited information exists on the occurrence and effects of T. bryosalmonae in wild salmonids. We investigated the presence of T. bryosalmonae in salmonids in Denmark and found that the parasite is common in the dominant wild Danish salmonid, brown trout Salmo trutta, and that it also appears in wild Atlantic salmon S. salar. Clinical signs of PKD were present in some brown trout, but in most cases the parasite was found through histology and/or PCR investigations of kidney tissue in fish that showed no signs of infection. Even though there was high similarity between internal transcribed spacer 1 (ITS1) sequences of T. bryosalmonae from wild brown trout, Atlantic salmon and farmed rainbow trout, a geographic pattern was indicated among T. bryosalmonae ITS1 phylotypes. None of the investigated streams were found free of T. bryosalmonae, but prevalence of the parasite was highly variable.

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Use of environmental DNA to detect the myxozoan endoparasite Tetracapsuloides bryosalmonae in large Norwegian lakes

Oredalen

Jenkins

et al. 2022

Environmental DNA

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Geographic distribution of Tetracapsuloides bryosalmonae infected fish in Swiss rivers: an update

Cited by 62 publications

References 28 publications

Proliferative kidney disease (PKD) agent Tetracapsuloides bryosalmonae in brown trout populations in Estonia

Proliferative kidney disease (PKD) agent Tetracapsuloides bryosalmonae in brown trout populations in Estonia

Tetracapsuloides bryosalmonae and PKD in juvenile wild salmonids in Denmark

Use of environmental DNA to detect the myxozoan endoparasite Tetracapsuloides bryosalmonae in large Norwegian lakes

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