This book presents a comprehensive review of various biological and ecological studies in animal science, including their embryology, evolution, classification, habitats and distribution. Topics discussed herein include cod aquaculture; the evolutionary history and habitats of the caucasian rock lizard; neuronal plasticity in the lizard brain; the house dust mite and allergic airway inflammation in asthma; special characteristics of the formation of population structure in Pacific cod and novel methodologies to assess metabolic changes of Atlantic cod (gadus Morhua) larvae in response to environmental factors.