Climate change significantly impacts global fisheries and aquaculture through rising ocean temperatures, ocean acidification, and deoxygenation, alongside altered freshwater flows and fish habitat loss. These changes are modifying fish distribution and productivity, with projections indicating a decrease in global fish community biomass by as much as 30% by 2100, particularly in tropical regions. Ocean acidification specifically impairs shell formation for crucial marine organisms like zooplankton, disrupting entire food webs and threatening vital ecosystems such as coral reefs and mangroves. The consequences extend to the sustainability of fisheries, the livelihoods of dependent coastal and inland communities, and global fish trade, leading to significant geopolitical and economic repercussions. While the fishing industry is a relatively small contributor to overall greenhouse gas emissions, it still emits millions of tonnes of CO2 annually, highlighting the importance of reducing its fuel use and environmental footprint.