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Latin american journal of aquatic research

versión On-line ISSN 0718-560X

Resumen

PONTES, Marcelo D. et al. Soybean and linseed oil in replacement of fish oil in diets for female lambari Astyanax altiparanae Garutti & Britski, 2000. Lat. Am. J. Aquat. Res. [online]. 2019, vol.47, n.2, pp.260-269. ISSN 0718-560X.  http://dx.doi.org/10.3856/vol47-issue2-fulltext-6.

This study aimed to evaluate the effect of different proportions of soybean and linseed oil to replace fish oil in diets for female lambari (Astyanax altiparanae). A completely randomized design with seven treatments and five replicates was used. The treatments consisted of a diet containing fish oil and six diets containing different proportions of soybean oil (S) and linseed oil (L), 10S/0L, 8S/2L, 6S/4L, 4S/6L, 2S/8L and 0S/10L. The fish that received the highest proportion of linseed oil (0S/10L) had the lowest crude lipid in their carcasses. The highest linolenic acid (18:3n3) concentrations were detected in the carcasses of fish fed diets with high proportions of linseed oil (4S/6L, 2S/8L, and 0S/10L). The highest n6/n3 ratios corresponded to the carcasses of fish fed diets containing the lowest proportions of linseed oil (10S/0L and 8S/2L). The highest levels of 20:5n3 (eicosapentaenoic acid [EPA]), 22:6n3 (docosahexaenoic acid [DHA]) and ZEPA+DHA occurred in fish fed diets containing fish oil. Among the fish that received diets with vegetable oils, the ZEPA+DHA was higher in the fish of the treatments 4S/6L, 2S/8L and 0S/10L. Diets supplemented with a 4S/6L proportion provide adequate deposition of the n3 fatty acids series in the lambari carcass.

Palabras clave : Astyanax altiparanae; vegetable oils; essential fatty acids; arachidonic acid; eicosapentaenoic acid; docosahexaenoic acid.

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