The edited book covers the climate change impact broadly across the ecosystems including increasing pressure on livelihood and food supplies to the society. Climate change, in particular, rising temperatures, can have both direct and indirect effects on global fish production. Fisheries and aquaculture is one of the important sectors of agriculture for livelihood and nutritional security. Fish, being poikilothermic in nature are very sensitive to any change in the ecosystem. In commercial aquaculture, it is crucial to ensure that environmental rearing conditions are adequate, if not optimal, for fish growth, welfare and profitability. Thus, the book develops an understanding regarding changes in relevant environmental parameters and its affect in the growth and physiological performance of fish. Fish feeds on natural food organisms, but the adverse changes in the ecosystem attracts nutritionists to provide better food and feeding strategies for optimum growth and survival of the fish. it is become necessary to develop preparedness about the changes and their mitigation strategies through fish nutrition and feeding strategies. This book addresses the potential impact of climate change on the aquaculture sector under sections - Assessment of Global Warming Impact on aquatic resources and fish production, Adaptation in Fish Digestive Physiology and Biochemistry under Changing Environment, Prioritization of fish feed technology with respect to changing climate for adaptation and mitigation, Strategies and planning on reproductive physiology and feed management for biodiversity conservation. The chapters are contributed by the experts in the field of fish nutrition and physiology. The book assists fish farmers, entrepreneurs, planners and advisors specifically related to nutritional and physico-biochemical changes in fishes to adapt or mitigate the adverse effect of climate change.