Marine environment is a habitant for several species and significantly plays an essential role in the food cycle and climate regulation. Several species including fish and invertebrates that are used as food for humans. Marine larvae species also contain metabolites and are useful for protection and cure of several diseases. This book provides information on aquaculture production, larval feeding, early stage of marine invertebrate’s bioassay and zebrafish model for drug toxicity. This book will interest scientists in the field of marine biotechnology, life sciences, materials scientists, aquaculture companies, and natural product researchers.