This book includes some of the vital pieces of work being conducted across the world, on various topics related to ichthyology or the study of marine fish and its varied branches such as aquatic biology. The text also includes modern techniques of ichthyology that are practiced across the globe. While understanding the long-term perspectives of the topics, the book makes an effort in highlighting their impact as a modern tool for the growth of the discipline. This book is appropriate for students seeking detailed information in this area as well as for experts. It includes contributions of international scientists which will provide innovative insights into this field.