Livestock and aquaculture feeds utilise crops such as soyabean and maize, with food conversion efficiencies similar in chicken and Atlantic salmon, and higher in pigs and cattle . Use of wild fish meal and oil has been decreasing, partly due to concerns regarding vulnerable small pelagic fish stocks . The instability of wild fish stocks has increased terrestrial crop feed components . The use of wild fish in fish feeds that may have been directly consumed may put low-income households at risk of food insecurity . An increasing demand for aquaculture products intensifies competition for feed supplies  . Increases in demands for animal protein and shifts to pescatarian diets will increase the existing competition for land resources, particularly in low- and medium-income countries, with negative impacts on food security , but may be mitigated by dietary changes, novel feeds and food waste usage for aquatic systems .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report