This book presents topical research from across the globe in the study of the biology, habitats and threats to aquatic animals. Topics discussed include the acoustic ecology of pinnipeds in polar habitats; the immunotoxicological reactivity of hemocytes of juvenile mudcrabs; the potential threat of genotoxic metals to marine mammal health; toxic contaminants in aquatic medium concerns and the role of bacteria in the chilled storage and cryopreservation of sperm in aquatic animals.