Infectious disease in aquaculture

Abstract: This chapter describes what is known about the main components and
responses of the innate and adaptive immune system of fi sh. The chapter fi rst
reviews the organs, cells and molecules of the immune system known in a few
economically important or model fi sh species. Molecular evidence suggests a
similar immune system exists throughout the jawed vertebrates yet marked
differences are also apparent. The innate parameters are at the forefront of fi sh
immune defence and are a crucial factor in disease resistance. The adaptive
response of fi sh is commonly delayed but is essential for long lasting immunity
and a key factor in successful vaccination.