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 (Makkar, 2018), but may be mitigated by dietary changes, novel feeds and food waste usage for aquatic systems (Berners-Lee et al., 2018; Hua et al., 2019; Cottrell et al., 2020).Competition over use of major aquaculture feed crops (Fry et al., 2016) with terrestrial livestock (Troell et al., 2014), and fish use by terrestrial livestock, will also place pressure on fish and crop resources