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<p>As aquaculture demand outpaces finite fish-oil supply, reliance on fish oil (FO) has become increasingly unsustainable for marine feeds. A promising alternative to fish oil replacement is linseed oil (LO), which provides n-3 essential fatty acid precursors for marine fish. Thus, the present study aimed to evaluate the substitution of FO with LO in diets for juvenile Gulf corvina, a Sciaenid species with high aquaculture potential. Four levels of FO substitution (0%, 33%, 66%, 100% LO) were evaluated in triplicate groups, using isonitrogenous (49% protein) and isolipidic (9% lipids) formulated diets with defatted shark meal as a protein source. Fish with an initial weight of 58&#xa0;g were reared at 24&#xa0;°C in a recirculating system composed of twelve 250-L fiberglass tanks. Fish were fed for 10&#xa0;weeks at a daily ration of 3% of biomass, divided into three equal meals per day. Growth was significantly higher in fish fed diets containing 0% and 33% LO compared to 66% and 100% LO. Muscle fatty acid content resulted in significant differences for fish fed the 66% and 100% LO diets compared to the control and 33% LO. Selective retention of the EFA in fish muscle was detected, particularly for EPA and DHA. Additionally, we evaluated the effect of fish oil substitution on the acute upper thermal tolerance of the fish by using a thermal challenge test (CTMax) to assess changes in the temperature tolerance of the juveniles under each dietary treatment. Upper thermal tolerance (critical thermal maximum, CTMax) did not differ among dietary treatments. In conclusion, up to 33% of the FO can be replaced by LO without affecting productive parameters, acute upper thermal tolerance, and fatty acid profile of the fish muscle, indicating that LO is a promising sustainable alternative lipid source for this species.</p>

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Effects of replacing dietary fish oil with linseed oil on growth, fatty acid profile, and acute upper thermal tolerance in juvenile Gulf corvina (Cynoscion othonopterus)

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • V. Rosas,
  • J. P. Lazo

摘要

As aquaculture demand outpaces finite fish-oil supply, reliance on fish oil (FO) has become increasingly unsustainable for marine feeds. A promising alternative to fish oil replacement is linseed oil (LO), which provides n-3 essential fatty acid precursors for marine fish. Thus, the present study aimed to evaluate the substitution of FO with LO in diets for juvenile Gulf corvina, a Sciaenid species with high aquaculture potential. Four levels of FO substitution (0%, 33%, 66%, 100% LO) were evaluated in triplicate groups, using isonitrogenous (49% protein) and isolipidic (9% lipids) formulated diets with defatted shark meal as a protein source. Fish with an initial weight of 58 g were reared at 24 °C in a recirculating system composed of twelve 250-L fiberglass tanks. Fish were fed for 10 weeks at a daily ration of 3% of biomass, divided into three equal meals per day. Growth was significantly higher in fish fed diets containing 0% and 33% LO compared to 66% and 100% LO. Muscle fatty acid content resulted in significant differences for fish fed the 66% and 100% LO diets compared to the control and 33% LO. Selective retention of the EFA in fish muscle was detected, particularly for EPA and DHA. Additionally, we evaluated the effect of fish oil substitution on the acute upper thermal tolerance of the fish by using a thermal challenge test (CTMax) to assess changes in the temperature tolerance of the juveniles under each dietary treatment. Upper thermal tolerance (critical thermal maximum, CTMax) did not differ among dietary treatments. In conclusion, up to 33% of the FO can be replaced by LO without affecting productive parameters, acute upper thermal tolerance, and fatty acid profile of the fish muscle, indicating that LO is a promising sustainable alternative lipid source for this species.