A total of 57 contributed research and review papers, as compiled in this edited volume, are basically the presentations of the 19th All India Congress of Zoology, organized by the Zoological Society of India at Gauhati University, Guwahati, India: December 2008. Wide ranging research themes have been scientifically explored in these papers, classified under 4 thematic sections: Biodiversity and wildlife Biology; Fish and Fishery Biology; Entomology and Sericulture; and Biochemistry, Toxicology and Physiology. Moreover, as the Congress was held in the north eastern part of India having a highly rich and amazing biological diversity, the proceedings incorporates a number of papers which provide a detailed description of the biological resources of the region. Contributors are eminent scientists from all over India.