“…The high levels of lipid and fatty acid contents found in B. glaciale and M. muelleri (Phleger et al, 1999;Lea et al, 2002;El-Mowafi et al, 2010;Koizumi et al, 2014;Grimaldo et al, 2020) make the species commercially and economically interesting for industrial, neutraceutical, and pharmaceutical purposes (Gjosaeter and Kawaguchi, 1980;Gjosaeter and Tilseth, 1983;Gjosaeter, 1984;Johannesson, 1991;Lamhauge et al, 2008;Tacon and Metian, 2009;Irigoien et al, 2014;Olsen and Torrisen, 2015;Grimaldo et al, 2018Grimaldo et al, , 2020Davidson et al, 2019). Some trial fisheries and surveys on mesopelagic species have already been conducted in different parts of the world; in the Gulf of Oman, the Indian Ocean, the California Current, and the Northeast Atlantic (Valinassab, 1998;Lamhauge et al, 2008;Sebastine et al, 2013;Davison et al, 2015;Grimaldo et al, 2018Grimaldo et al, , 2020Malvarosa et al, 2019). But before such potential large-scale exploitation the ecological and the economic sustainability of the fishery needs to be thoroughly assessed.…”