article · Animals
A 56-day feeding trial evaluated the effects of replacing dietary fish oil with camelina oil at various ratios in juvenile red seabream. The findings demonstrated that substituting fish oil up to complete replacement had no significant adverse impacts on growth parameters, feed conversion ratios, feed intake, biometric indices, or survival rates. Blood chemistry profiles remained unaffected across all dietary treatments. Whole-body composition showed no significant differences among treatments apart from crude lipid levels, which were highest in the fish oil control group. Modulation of liver antioxidant enzymes occurred, with lower catalase and superoxide dismutase activities observed under total fish oil substitution compared to control diets. The evidence indicates that camelina oil can replace up to 100 percent of dietary fish oil in red seabream feeds, provided essential long-chain polyunsaturated fatty acids such as EPA and DHA are maintained at required levels.
Aquaculture depends heavily on wild-harvested fish oil to nourish farmed marine species, creating ecological and supply challenges. Demonstrating that a plant-derived alternative like camelina oil can replace marine fish oil without compromising red seabream growth or general health offers a route toward more sustainable aquafeed production and reduced pressure on marine ecosystems.
This research provides applied, experimental evidence directly relevant to aquafeed manufacturers and commercial fish farming enterprises. By proving that camelina oil can functionally replace dietary fish oil, the work supports the development of alternative feed formulations. It represents an applied stage of testing in juveniles, meaning full commercial deployment would require scaling up validation across complete grow-out cycles and verifying economic viability.
AI-generated from the published abstract. Always read the original work before citing.
A 56-day feeding trial to evaluate the responses of red seabream (initial weight: 1.8 ± 0.02 g) to the substitution of fish oil (FO) with camelina oil (CO) at different ratios was conducted. The control diet formulated at 46% CP (6F0C) contained only FO without CO; from the second to the fifth diet, the FO was substituted with CO at rates of 5:1 (5F1C), 4:2 (4F2C), 3:3 (3F3C), 2:4 (2F4C), and 0:6 (0F6C). The results of the present study showed that up to full substitution of FO with CO showed no significant effect on growth variables BW = 26.2 g-28.3 g), body weight gain (BWG = 1275.5-1365.3%), specific growth rate (SGR = 4.6-4.7), feed intake (FI = 25.6-27.8), feed conversion ratio (FCR = 1.0-1.1), biometric indices condition factor (CF = 2.2-2.4), hepatosomatic index (HSI = 0.9-1.1), viscerasomatic index (VSI = 7.5-9.5), and survival rates (SR = 82.2-100) with different FO substitution levels with CO. Similarly, there were no significant differences (<i>p</i> < 0.05) found in the whole-body composition except for the crude lipid content, and the highest value was observed in the control group (291 g/kg) compared to the other groups FO5CO1 (232 k/kg), FO4CO2 (212 g/kg), FO2CO4 (232 g/kg) and FO0CO6 (244 g/kg). Blood chemistry levels were not influenced in response to test diets: hematocrit (36-33%), glucose (Glu = 78.3-71.3 mg/dL), total protein (T-pro = 3.1-3.8 g/dL), total cholesterol (T-Chol = 196.0-241 mg/dL), blood urea nitrogen (BUN = 9.0-14.6 mg/dL), total bilirubin (T-Bil = 0.4-0.5 mg/dL), triglyceride (TG = 393.3-497.6 mg/dL), alanine aminotransferase test (ALT = 50-65.5 UL/L), aspartate aminotransferase test (AST = 38-69.3 UL/L). A remarkable modulation was observed in catalase (CAT) and superoxide dismutase (SOD) activities in the liver, as CAT and SOD values were lower with the complete FO substitution with CO (0F6C), and the highest values were observed in the control and (4F2C). This study indicates that red seabream may have the ability to maintain LC-PUFAs between tissues and diets, and CO substitution of FO could improve both lipid metabolism and oxidation resistance as well as maintain digestibility. In conclusion, dietary FO can be replaced up to 100% or 95% by CO in the diets of red seabream as long as n-3 HUFA, EPA, and DHA are incorporated at the recommended level.
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DOI: 10.3390/ani11071990
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