Enas Sheet Mustafa and Shahbaa Khalil AL-Taee Doi: https://doi.org/10.37940/AJVS.2020.13.2.1 Abstract The fish inhabitant in an aquatic environment so it persists exposure to pathogen and stressor factors so they have a developing immune system similar to that in high vertebrate with some differences points. Head Kidney considered the main and primary hematopoietic organs while spleen, thymus and … Continue reading Innate and Adaptive Immunity in Fish: A Review