In biocatalysis Marine enzymes initially examines the character and level of interest in marine biological diversity, and also outlines the basics of biocatalysis. It’s a detail sources of marine enzymes, and to analyse examples from both chemical and stereochemical viewpoints of catalysis, including microbial enzymes and animal or plant sources. These processes can cash in of the habitat related properties of marine enzymes like salt tolerance, cold adaptivity, hyperthermostability then thereon enzymes, like salt tolerance, barophilicity, hyperthermostability ,cold adaptivity, then on and these properties are linked to the metabolic functions of the enzymes and to the ecological aspects of the natural source and . The New properties are often discovered at the molecular level of catalysis and particularly concerning stereochemical characteristics of the products.