Fillet discoloration by red and melanized focal changes (RFCs and MFCs) is common in farmed Atlantic salmon Salmo salar. In farmed rainbow trout Oncorhynchus mykiss, similar changes have been noted, but their prevalence and histological characteristics have not been investigated. Thus, we conducted a study encompassing 1293 rainbow trout from 3 different farm sites in Norway, all examined at the time of slaughter. Both macroscopic and histological assessments of the changes were performed. Reverse transcription (RT)-qPCR analyses and in situ hybridization (ISH) were used to detect the presence and location, respectively, of potential viruses. Only 1 RFC was detected in a single fillet, while the prevalence of MFCs ranged from 1.46 to 6.47% between populations. The changes were predominantly localized in the cranioventral region of the fillet. Histological examinations unveiled necrotic myocytes, fibrosis, and regeneration of myocytes. Melano-macrophages were found in the affected areas and in myoseptal adipose tissue. Organized granulomas were observed in only 1 fish. Notably, the presence of inflammatory cells, including melano-macrophages, appeared lower compared to what has been previously documented in Atlantic salmon MFCs. Instead, fibrosis and regeneration dominated. RT-qPCR and ISH revealed the presence of piscine orthoreovirus 1 (PRV-1) and salmonid alphavirus (SAV) in skeletal muscle. However, these viruses were not consistently associated with lesioned areas, contrasting previous findings in Atlantic salmon. In conclusion, rainbow trout develop MFCs of a different character than farmed Atlantic salmon, and we speculate whether the observed pathological differences are contributing to their reduced occurrence in farmed rainbow trout.
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Iturriaga, Mathias
Brisa Espinoza, Marlen
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Brisa Espinoza, Marlen
Poblete-Morales, Matias
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Interdisciplinary Ctr Aquaculture Res INCAR, Concepcion 4030000, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Poblete-Morales, Matias
Gloria Feijoo, Carmen
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Interdisciplinary Ctr Aquaculture Res INCAR, Concepcion 4030000, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Gloria Feijoo, Carmen
Reyes, Ariel E.
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Interdisciplinary Ctr Aquaculture Res INCAR, Concepcion 4030000, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Reyes, Ariel E.
Molina, Alfredo
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Interdisciplinary Ctr Aquaculture Res INCAR, Concepcion 4030000, Chile
Univ Andres Bello, Ctr Invest Marina Quintay CIMARQ, Fac Ecol & Recursos Nat, Valparaiso 2340000, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Molina, Alfredo
Avendano-Herrera, Ruben
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Interdisciplinary Ctr Aquaculture Res INCAR, Concepcion 4030000, Chile
Univ Andres Bello, Ctr Invest Marina Quintay CIMARQ, Fac Ecol & Recursos Nat, Valparaiso 2340000, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Avendano-Herrera, Ruben
Antonio Valdes, Juan
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Univ Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
Interdisciplinary Ctr Aquaculture Res INCAR, Concepcion 4030000, Chile
Univ Andres Bello, Ctr Invest Marina Quintay CIMARQ, Fac Ecol & Recursos Nat, Valparaiso 2340000, ChileUniv Andres Bello, Fac Ciencias Biol, Dept Ciencias Biol, Santiago 8370146, Chile
机构:
Univ Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Han, Yuna
Kaneko, Gen
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Univ Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Kaneko, Gen
Nagasaka, Reiko
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Tokyo Univ Marine Sci & Technol, Dept Food Sci & Technol, Lab Food Chem & Funct Nutr, Tokyo 1088477, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Nagasaka, Reiko
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Kondo, Hidehiro
Hirono, Ikuo
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Tokyo Univ Marine Sci & Technol, Grad Sch Marine Sci & Technol, Lab Genome Sci, Tokyo 1088477, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Hirono, Ikuo
Takahashi, Shin-Ichiro
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Univ Tokyo, Lab Anim Cell Regulat, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Takahashi, Shin-Ichiro
Watabe, Shugo
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Univ Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Kitasato Univ, Sch Marine Biosci, Sagamihara, Kanagawa 2520373, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Watabe, Shugo
Ushio, Hideki
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Univ Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
Tokyo Univ Marine Sci & Technol, Dept Food Sci & Technol, Lab Mol Food Funct, Tokyo 1088477, JapanUniv Tokyo, Marine Biochem Lab, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan