Histopathological lesions in the liver of salmonids, from the X to XII Region of Chile. Frequency and distribution according to the age and the season of the year, 1988-1998

• Published in: Archivos de medicina veterinaria
• Main Authors: LÓPEZ, I. C., CUBILLOS, V., ERNST, S., ROSENFELD, C.
• Format: Article in Journal/Newspaper
• Language: Spanish
• Published: Archivos de Medicina Veterinaria 2001
• Subjects: salmonídeos; alteraciones hepáticas; salmonids; liver damage; Atlantic salmon
• Online Access: http://revistas.uach.cl/index.php/amv/article/view/4641; https://doi.org/10.4067/S0301-732X2001000200008

The purpose of this report was to analize the kinds of lesions present in livers of salmonids grown in fish farms in the Tenth to Twelfth Region of Chile, from 1988 until 1998, in relation to age and seasons. Anatomic-pathologic reports from the Animal Pathology Institute of the Veterinary Science Faculty, corresponding to: 319 coho salmon (O. kisutch), 184 Atlantic salmon (S. salar), 26 chinook salmon (O. tschawytscha) and 180 rainbow trout (O. mykiss), were analysed The results of this research indicate that 45.0% of the total amount of liver samples received (from 1988 until 1998), corresponded to coho salmon. The largest percentage of liver samples received corresponded to smolts and 53.0% of them corresponded to coho smolts. Most of the liver samples were received between 1989 and 1992, mainly in summer. Their aetiology was related to the presence ofPiscirickettsia salmonis, that produces"Salmonid Rickettsial Septicemia"(SRS). A second peak was noticed between 1994 and 1996, increasing in autumn. This was attributed to the presence of"Limphoblastic Leukemia"(LL). Con el propósito de determinar los tipos de alteraciones presentes en hígados de salmonídeos y su relación con la edad y estaciones del año, se analizaron 709 informes anatomopatológicos correspondientes a muestras hepáticas de salmonídeos (S. salar, O. kisutch, O. tschawytscha, O. mykiss) recepcionadas en el Instituto de Patología Animal de la Facultad de Ciencias Veterinarias de la UACh, provenientes de centros de cultivo de la Xª a XIIª Región de Chile, durante el período 1988-1998.Los resultados obtenidos indican que del total de muestras recepcionadas, el 91,5% de los hígados presentaron alteraciones microscópicas, no apreciándose diferencias entre especies. Por otra parte, se observaron dos incrementos en la recepción de muestras en el lapso estudiado, el primero entre 1990-1992, en los meses de verano, y el segundo, entre 1994-1996, en los meses de otoño, correspondiendo a la presencia de Síndrome Rickettsial Salmonídeo y Leucemia ...