This book discusses the harvesting, prevalence and benefits of tilapia and trout. Chapter One begins with a review of the risks and benefits of tilapia. Chapter Two provides a human health risk assessment of heavy metals in the consumption of the fish. Chapter Three studies the utilisation of by-products and waste generated from the tilapia processing industry. Chapter Four reviews thermal ecology of brown trout and the climate change challenge. Chapter Five examines reparative neurogenesis in the adult trout brain and peculiarity of development in the trout's brain cells in primary culture. Chapter Six focuses on the effects of plant-based feeds on the immune responses of rainbow trout.