Overfishing and the climate crisis are two of the most prominent threats to marine life, affecting the size, distribution and abundance of species globally. To determine how these growing pressures influence the nutritional contribution of global fisheries, an international team of researchers led by Lancaster University have combined data on the micronutrient content of species with a vulnerability index that indicates species susceptibility to climate change and overfishing. They apply these metrics to more than 800 fish species across 157 countries.