Patterns of Tetracapsuloides bryosalmonae infection of three salmonid species in large, deep Norwegian lakes

Abstract

Wild and cultured salmonids, including Atlantic salmon (Salmo salar), brown trout (Salmo trutta), rainbow trout (Oncorhynchus mykiss) and Arctic charr (Salvelinus alpinus), have high ecological, recreational

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

“…The detection of T. bryosalmonae by eDNA was consistent with parasite detection in fish in three of the five lakes (Lake Fyresvatn, Lake Tinnsjå, and Lake Norsjø) sampled in 2018 (Oredalen et al, 2022). In fish, T. bryosalmonae was recently reported in wild Arctic charr Lake Tinnsjå and Lake Norsjø and in farmed Arctic charr in Lake Fyresvatn.…”

Distribution and prevalence of the myxozoan parasite Tetracapsuloides bryosalmonae in northernmost Europe: analysis of three salmonid species

“…In contrast to Atlantic salmon and brown trout, we did not find any T. bryosalmonae infections among studied Arctic char. This is likely due to the low number of collected specimens and limited sampling locations, since T. bryosalmonae is able to infect Arctic char (Kristmundsson et al 2010, Mo & Jørgensen 2017, Svavarsdóttir et al 2021, Oredalen et al 2022.…”

“…T. bryosalmonae is widely distributed in temperate regions of Europe, ranging from Spain to Norway and from Iceland to Estonia (Peribáñez et al 1997, Kristmundsson et al 2010, Skovgaard & Buchmann 2012, Jenčič et al 2014, Dash & Vasemägi 2014, Mo & Jørgensen 2017, Oredalen et al 2022, Svavarsdóttir et al 2021. Additionally, T. bryosalmonae has been found close to 65°N latitude in Alaska, and in northern Norway and Finland (Kristmundsson et al 2010, Mo & Jørgensen 2017, Sobo ciński et al 2018, Gorgoglione et al 2020, Svavarsdóttir et al 2021.…”

“…Collected fish were stored individually in plastic bags and immediately frozen for transport to the laboratory. In the laboratory, the fish were thawed for measurement of total length and weight similar to as described in Oredalen et al (2022). Subsequently, using a sterile scalpel, a cross-section was produced by cutting the body between the front tip and the end of the dorsal fin as in Bruneaux et al (2017).…”

Mitigating human impacts including climate change on proliferative kidney disease in salmonids of running waters

“…The central hypothesis of this review is that due to the warming effect of climate change on water temperatures (Caissie, 2006;Sherwood et al, 2020;van Vliet et al, 2013), salmonid populations are increasingly under pressure of devastating effects of PKD (Waldner et al, 2020(Waldner et al, , 2021. The case is made that preserving a healthy river ecosystem with summercool water temperatures plays an important role in controlling the infectious disease (Oredalen et al, 2021; for lakes see : Sobocinski et al, 2018). Under ideal environmental conditions, that is, oxygenrich mountainous water, close to the source and with summer water temperatures lower than 15°C, T. bryosalmonae infections do not result in PKD (Kristmundsson et al, 2010;Ros et al, 2021;Wahli et al, 2002).…”