Aquaculture–culture of aquatic organisms including aquatic vegetations under controlled conditions which are now recognized as a viable and profitable farming or enterprise worldwide. Marine larviculture without live feed or crustacean cultures without microalgae are rarities in commercial aquaculture. The development of commercial formulated feeds remains today's upcoming challenge. In the mean time, the industry continues the struggle to produce stable quantities of high quality live feeds. There are important major areas of interest in which twenty three chapters are included. This textbook aims for a better understanding of biology and culture requirements live feeds with examples. This is a guide for anyone who interested in areas range from general aquaculture to animal nutrition to live feed manufacture and student communities in particular.