The Effect of the Photoperiod on the Lipid Profile in Hatchery-Reared Atlantic Salmon Salmo salar L. Fingerlings (0+)

New data on the effect of additional lighting on the lipid profile of Atlantic salmon 0+ fingerlings during growth and development under artificial cultivation in fish farming conditions were obtained. The influence of different lighting modes, such as standard farming lighting conditions (control), experimental modes of 16 h of light and 8 h of dark (16 : 8), and constant lighting (24 : 0), were studied. Specific modifications of the lipid profile—mainly in the content of structural lipids (phospholipids) as well as indexes of the ratios of structural and reserve lipids: the cholesterol/phospholipids (Chol/PL) and triacylglycerols/phospholipids (TAG/PL)—were found in the fingerlings whose development took place under the conditions of experimental photoperiod regimes. These changes were more pronounced in young salmons cultivated under round-the-clock lighting (24 : 0).