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- W2023696282 abstract "There is an increasing trend towards the replacement of fish oil (FO) by vegetable oils in feeds for farmed fish, particularly marine carnivores. Previous researches on partial or complete replacement of FO by alternate vegetable oils for young gilthead seabream (Sparus aurata) were successful. The aim of the present study was to investigate the effects of different dietary vegetable oils on seabream growers' health and liver structure. Two dietary vegetable oil blends (Mix 1 and Mix 2), namely sunflower oil, cottonseed oil and either linseed oil (LO) or soybean oil (BO), were tested as 60% FO substitutes versus the 100% FO control (CTR) diet. Three isonitrogenous (∼47% CP) and isolipidic (18.2% L) diets were fed, twice a day, 6 days a week to apparent satiation, to triplicate groups of seabream growers (mean IW, 130.85 g) in PVC tanks. The growth trial lasted for 20 weeks at an average ambient water temperature of 27.0±1.8°C. At the end of the experiment, fish attained market size (300–400 g) and their health status was evaluated by blood analyses, head kidney prints and liver histology. Haemoglobin and haematocrit contents, erythrocyte (RBC) and leucocyte (WBC) count remained significantly unaffected by any dietary treatments. Despite the apparent relatively higher thrombocyte counts for fish fed vegetable oil diets, especially Mix 2 as compared with those of CTR fish, variations were found to be insignificant (P>0.05). However, a slight deformation in erythrocyte shape was noticed in the blood films of fish fed the vegetable oil diets. Inclusion of either dietary vegetable oil blend had also elevated the number of both developing myelocytes and phagocytes in fish head kidney prints examined compared with those of CTR fish particularly for Mix 2 group. Liver from seabream fed vegetable oils showed slightly swelled hepatocytes due to accumulation of oil droplets in the cytoplasm. In the liver sections investigated ultra-structurally, nuclei and cytoplasmic organelles were shifted towards the cell periphery. Hepatocytes of fish fed Mix 2 diet showed relative shrinkage and picnotic nuclei, compared with those of CTR fish, suggesting an effect on lipid transport and/or metabolism in fish. The comparative hepatic features between experimental fish groups were described. Accordingly, Mix 1 diet (with LO) was considered better than Mix 2 (with BO) in terms of influence on seabream growers' health status." @default.
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- W2023696282 date "2007-06-01" @default.
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- W2023696282 title "Effect of dietary vegetable oils on health and liver histology of gilthead seabream (Sparus aurata) growers" @default.
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