Cholesterol/metabolism; Diet/veterinary; Liver/metabolism; Phytosterols/metabolism; Salmo salar/metabolism; Triglycerides/metabolism; Animals; Aquaculture; Cholesterol/administration & dosage; Cholesterol/blood; Cholesterol 7-alpha-Hydroxylase/biosynthesis; Cholesterol 7-alpha-Hydroxylase/genetics; Cholesterol 7-alpha-Hydroxylase/metabolism; Diet/adverse effects; Dietary Proteins/administration & dosage; Dietary Proteins/adverse effects; Dietary Proteins/metabolism; Fatty Acids, Monounsaturated; Fish Proteins/biosynthesis; Fish Proteins/genetics; Fish Proteins/metabolism; Gene Expression Regulation, Developmental; Liver/enzymology; Liver/growth & development; Liver X Receptors; Olive Oil; Orphan Nuclear Receptors/biosynthesis; Orphan Nuclear Receptors/genetics; Orphan Nuclear Receptors/metabolism; Oxidoreductases Acting on CH-CH Group Donors/biosynthesis; Oxidoreductases Acting on CH-CH Group Donors/genetics; Oxidoreductases Acting on CH-CH Group Donors/metabolism; Phytosterols/administration & dosage; Phytosterols/adverse effects; Plant Oils/administration & dosage; Plant Oils/adverse effects; Plant Oils/metabolism; Plant Proteins/administration & dosage; Plant Proteins/adverse effects; Plant Proteins/metabolism; Rapeseed Oil; Salmo salar/blood; Salmo salar/growth & development; Soybean Oil/administration & dosage; Soybean Oil/adverse effects; Soybean Oil/metabolism; Sterol Regulatory Element Binding Protein 2/biosynthesis; Sterol Regulatory Element Binding Protein 2/genetics; Sterol Regulatory Element Binding Protein 2/metabolism; Triglycerides/administration & dosage; Triglycerides/blood; Weight Gain