1. Introduction
  1.1 Background
  1.2 Research Objectives
2. Overview of the Immune System
  2.1 Components of the Immune System
  2.2 Innate and Adaptive Immunity
  2.3 Immune Responses and Mechanisms
3. Comparative Anatomy of Marine Animal Immune Systems
  3.1 Invertebrates
      3.1.1 Mollusks
      3.1.2 Crustaceans
      3.1.3 Echinoderms
  3.2 Fish
      3.2.1 Cartilaginous Fish
      3.2.2 Bony Fish
  3.3 Marine Reptiles
  3.4 Marine Mammals
4. Immune System Adaptations in Marine Environments
  4.1 Challenges and Pressures
  4.2 Unique Defense Mechanisms
  4.3 Immunological Interactions with Marine Microorganisms
5. Immune System Function in Marine Animal Health
  5.1 Disease Resistance and Susceptibility
  5.2 Immune System Development and Maturation
  5.3 Immunological Memory