The article examines the effects of climate change on UK fisheries and marine ecosystems, focusing on how rising sea temperatures are causing shifts in species distribution, such as mackerel and Atlantic bluefin tuna moving northward. This shift impacts food security, the fishing industry, and can lead to disputes over fishing quotas as fish cross jurisdictions. While there are opportunities for new species like anchovy and seabass in Scottish waters, challenges such as consumer preferences and rigid quota systems remain. The article highlights the need for the seafood industry to adapt dynamically and for supermarkets to educate consumers on sustainable seafood options.