Silver nanoparticles are incorporated in many consumer and biomedical products due to their unique antimicrobial properties. Continuous use of these products can result to accumulation of silver particles in the aquatic environment which may pose health risks to living organisms. This research was carried out to determine the effects of silver nanoparticles on the ventilation rate, haematological parameters and on selected tissues of Nile tilapia Oreochromis niloticus. Results showed that presence of silver nanoparticles in water increased the ventilation rate of Oreochromis niloticus....