The destruction of marine habitats and the marine environment generally results from the cumulative impact of several threats, such as fishing (bycatch, illegal and ghost fishing), pollution in all its forms (chemical, organic and physical), and climate change. All these threats have contributed to the degradation of the seabed and marine biodiversity. Endangered vertebrates are the most affected by these problems. This book presents scientific information on the biology and ecology of sea turtles, sharks, and cetaceans, as well as fisheries' impact on these endangered species to enhance conservation and management efforts.