The course is to provide the basics of aquatic biology on the aspects of natural history and diversity of fish. • Basic anatomy of Fish and Shellfish • Study of food and feeding habits of commercially important fish. • Digestive system, Natural fish food, Types of feeding • Qualitative and Quantitative methods of analysis of stomach contents. • Age and growth determination by direct and indirect methods. • Reproductive biology: maturity stages, gonadosomatic index, pondoral index, fecundity, sex ratio and spawning. • Eggs and larval stages and developmental biology of finfishes and shell fishes. • Tagging and marking of finfish and shellfish. • Behavior and cognition. Schooling, orientation and migration. • Symbiosis and biodiversity