Evaluación Clínica Del “Posible Síndrome De La Marca Roja” En Ejemplares De Trucha Arcoíris (Oncorhynchus Mykiss) Cultivadas En Sistema Ras En La Estación Piscícola La Cascada.

Abstract

This clinical case internship report describes the clinical evaluation of a condition consistent with red spot syndrome (RMS) in rainbow trout (Oncorhynchus mykiss) raised in recirculating aquaculture systems (RAS) at La Cascada Fish Farm (Mutiscua, Norte de Santander). Multifocal, reddish, and slightly raised dermal lesions were observed, without systemic involvement or associated mortality. The diagnostic plan included sampling for microbiology, molecular biology, necropsy, and histopathology; dermatitis with myositis consistent with RMS was found. Treatment consisted of oral Florfenicol (initial phase at 20 mg/kg for 3 days and maintenance phase at 15 mg/kg for 9 days), supplemented with vitamin C (ascorbic acid) at 1 g/kg of feed, as immunomodulatory, antioxidant, and tissue repair support. Progressive clinical improvement was documented (reduction in redness and exudate, and recovery of skin integrity), although systematic photographic evidence failed to record a natural disaster that caused mass mortality. These findings provide preliminary evidence of RMS and underscore the importance of biosecurity, differential diagnosis, and therapeutic support in farmed salmonids.