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Soybean and linseed oil in replacement of fish oil in diets for female lambari Astyanax altiparanae Garutti & Britski, 2000

2019; Escuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso; Volume: 47; Issue: 2 Linguagem: Inglês

10.3856/vol47-issue2-fulltext-6

0718-560X

Marcelo Duarte Pontes, Daniel Abreu Vasconcelos Campelo, Renato Ferraz, Jener Alexandre Sampaio Zuanon, Wilson Massamitu Furuya, Ana Lúcia Salaro,

Reproductive biology and impacts on aquatic species

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 Σ EPA+DHA occurred in fish fed diets containing fish oil. Among the fish that received diets with vegetable oils, the Σ EPA+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.