Polyploidy affects fillet yield, composition, and fatty acid profile in two-year old, female rainbow trout, Oncorhynchus mykiss

Gonadal development in fish is a dominant physiological process that alters growth and fat metabolism, thereby affecting fillet quality. Sterile, triploid (3 N) female rainbow trout are generated by pressure-induced shock of zygotes (3NP), crossing diploid (2 N; fertile) tetraploid (4 male to produce offspring 100% the time (3NC; sterile). We have shown intercross-triploids (3NC) faster rates than triploids (3NP). Using subset these animals, we examined yield, texture fatty acid composition; additionally, composition triglycerides phospholipids was determined. Variables were measured immediately prior ovulation animals. Separable muscle as percent whole body weight higher (P ≤ 0.05) 3NC (46.5%) compared with 3NP (43.6%) fish, both had yields 2 N (38.3%) individuals. Fillets from fillets contained more intramuscular crude (13.4%, 11.2%, 8.17%, respectively). Also, fewer total saturated acids (29.2%) (33.4%) which turn, (34.9%) fillets; suggesting diploids stored SFA used for egg development. Although polyunsaturated relative all (PUFA, 28.7%) (23.6% 24.8%, respectively), highest concentration per gram fillet. levels C12:0, C14:0, N. Fatty acids, C16:0 16:1, 3NC, C22:6n3, C20:3n6 C18:1n9c 3NP. Linoleic (18:2n6c) followed 0.05). Thin Layer Chromatography plates separate lipid classes evaluate each class. Ploidy did not affect > present triglyceride phospholipids. Albeit, 0.10) C16:1, C18:1n9c, C18:2n6c, C18:3n3 C22:1n9 phospholipids; whereas C16:0, C20:4n6, C20:5n3, C22:6n3. Notably, 3 times C22:6n3 docosahexaenoic (DHA) triglycerides. Overall, exhibited superior concentrations females, profile different, exceptions C16:1.