Abstract

TRIANA-GARCIA, Pedro A; GUTIERREZ-ESPINOSA, Mariana C  and  ESLAVA-MOCHA, Pedro R. Productive performance and fatty liver in hybrids of red tilapia (Oreochromis spp): Effects of two dietary lipid sources. Orinoquia [online]. 2013, vol.17, n.2, pp.183-196. ISSN 0121-3709.

With the aim to evaluate the effect of animal and vegetable lipids on productive performance and development of fatty liver in fingerlings of hybrid tilapia (Oreochromis spp), six diets whit fish oil and soy bean oil as source of lipids were performed. The lipid levels were 5, 9 and 13% of each source, and the feeding period was 60 days. Values of productive performance parameters, hepatosomatic index-HIS and viscerosomatic index- IVS were determined. Additionally, liver histopathologic evaluation was performed with differential stains for lipids and carbohydrates. Weight increase of fish fed with 5, 9 and 13% of soy bean oil was observed as compared with those fed with 5 and 9% of fish oil. Soy bean oil at 13% in diets reduced the HSI of fish as compared with those fed with 5 and 9%. No differences were observed among treatments concerning SVI. The severity of fat infiltration was lower in fish fed diets with 5, 9 and 13% of soy bean oil. The present set of data allows to inferring that dietary soy bean oil, a n-6 polyunsaturated fatty acids rich nutrient, improves the productive performance and decreases the incidence of hepatic lipidosis of hybrid tilapias as compared with fish oil, a n-3 polyunsaturated fatty acids and long chain polyunsaturated fatty acids rich nutrient.

Keywords : hepatic lipidosis; Tilapia; Free fatty acids; lipid metabolism.

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