“…The fatty acid composition of cellular membranes can modify permeability (Imen et al, 2013;Palacios, Bonilla, Perez, Racotta, & Civera, 2004). Huster, Jin, Arnold, and Gawrisch (1997), Hishikawa, Valentine, Iizuka-Hishikawa, Shindou, and Shimizu (2017), and Cornet et al (2018) reported that high levels of PUFA, such as DHA, could make membranes thin, flexible and fluid, while Morris, Lockwood, and Dawson (1982) reported the possible relationship between decreased permeability and increased SFA in the gills of amphipod crustaceans (Gammarus duebeni). From another point of view, the accumulation of n-3 PUFA, especially EPA and DHA, can alter the membrane microenvironment and thereby enhance NKA activity (Bell et al, 1997;Bystriansky & Ballantyne, 2007;Grant et al, 2008 It is generally believed that when external salinity is altered, the response of serum osmolality in teleost fish can be divided into two stages: first, a passive increase or decrease in serum osmolality occurs depending on the environment; second, osmolality begins to recover through physiological regulation and remains stable (Sturrock, Hunter, Milton, & Trueman, 2013;Zhu et al, 2018).…”