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The use of K luyveromyces marxianus in the diet of R ed‐ S tirling tilapia ( O reochromis niloticus, L innaeus) exposed to natural climatic variation: effects on growth performance, fatty acids, and protein deposition
Author(s) -
Ribeiro Cristiéle S,
Moreira Renata G,
Cantelmo Osmar A,
Esposito Elisa
Publication year - 2014
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12023
Subject(s) - biology , oreochromis , kluyveromyces marxianus , polyunsaturated fatty acid , fish meal , zoology , food science , tilapia , biochemistry , fishery , yeast , fatty acid , fish <actinopterygii> , saccharomyces cerevisiae
Abstract The purpose of this study was to evaluate the use of single cell proteins ( K luyveromyces marxianus ) as fishmeal substitutes for O reochromis niloticus during long‐term feeding under natural climatic conditions. Juveniles (150) were divided into two groups: the control group, fed with conventional fish diet (T1); and the experimental group, fed with the alternative diet (T2). T1 animals had a higher final weight and per cent weight gain than T2 animals, which we mainly observed in winter and autumn. The lipid content ranged from 1.9% to 3.8% in liver and from 0.2% to 1% in white muscle for both groups. T2 animals had a higher protein concentration in the fillet and the lipid content in this tissue was not altered by diet. Liver and plasma protein content in both groups and the muscle content in T1 decreased during growth. Specific fatty acids ( FA s) were selectively retained in fillet phospholipids ( PL s), primarily as C22:6n3, which was found at high levels in the PL s of both groups during all seasons. Despite the differences observed, the percentage of polyunsaturated FA s in the fillet was similar throughout the experiment for both diets, reaching approximately 50% of the total FA in the PL s.