Long term partial replacement of dietary fish oil with rapeseed oil; effects on egg quality of Atlantic salmon Salmo salar
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Published source details
Rennie S., Huntingford F.A., Loeland A-L. & Rimbach M. (2005) Long term partial replacement of dietary fish oil with rapeseed oil; effects on egg quality of Atlantic salmon Salmo salar. Aquaculture, 248, 135-146.
Published source details Rennie S., Huntingford F.A., Loeland A-L. & Rimbach M. (2005) Long term partial replacement of dietary fish oil with rapeseed oil; effects on egg quality of Atlantic salmon Salmo salar. Aquaculture, 248, 135-146.
Actions
This study is summarised as evidence for the following.
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Use an alternative oil source: plant-based Action Link |
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Use an alternative oil source: plant-based
Between 2002 and 2003, a study in Norway (Rennie et al., 2005) found that salmon, Salmo salar, broodstock fed diets containing pure fish oil and a mix of fish and rapeseed oil had similar levels of adult fecundity, egg weights plus development and body weight in resultant fry. The fatty acid profiles of both the eggs and fry reflected the oil source and were different. Rates of fertilisation, eyeing and hatching plus fry survival to first feeding were similar between diets. Approximately 315 salmon were tagged and distributed across three sea cages. One cage was fed a broodstock diet containing 100 % fish oil. The other two cages were fed a diet containing 50% fish oil and 50% rapeseed oil. Fish were weighed intermittently. Fecundity and egg weights were measured in mature salmon transferred to fresh water. Eggs were fertilised using a pool of milt from three males of the same treatment. Pre-fertilised eggs and fry underwent fatty acid chemical analysis. Rates of fertilisation were recorded, alongside eyeing, hatching and survival rates in the fry.
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