Ultrasound Imaging Used to Detect Cysts of Henneguya salminicola (Protozoa: Myxozoa) In the Flesh of Whole Pacific Salmon

Abstract

Whole sockeye salmon, Oncorhynchus nerka, were scanned using an ultrasound imaging system. In real images, representing cross-sections of the soma, cysts (confirmed by subsequent dissection) were depicted as dark spheres against a lighter background of somatic muscle. This technique proved to be unsatisfactory with fish that were previously frozen.