Open AccessEffect of diets containing laurel seed oil on growth and fatty acid composition of rainbow trout, Oncorhynchus mykiss
Author(s) -
Dernekbaşı S.,
Karayücel İ.,
Akyüz A.P.
Publication year - 2017
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12382
Subject(s) - biology , docosahexaenoic acid , rainbow trout , polyunsaturated fatty acid , eicosapentaenoic acid , food science , fish oil , fatty acid , composition (language) , zoology , biochemistry , fishery , fish <actinopterygii> , linguistics , philosophy
The aim of this study was to determine the effects of replacing fish oil ( FO ) with laurel seed oil ( LSO ), as an alternative plant lipid source in diets on the growth and fatty acid composition of rainbow trout ( Oncorhynchus mykiss; 111.47 ± 0.2 g mean individual weight). At the end of the feeding trial, survival was 100% in all treatments. No significant differences were seen in growth between the dietary groups ( P > 0.05). The protein, lipid and ash contents were not significantly different among the groups ( P > 0.05); however, there was a significant difference in protein and ash content between the treatment groups and the initial, and between the 50 LSO group and the initial group, respectively ( P < 0.05). The viscerosomatic index ( VSI ) and hepatosomatic index ( HSI ) values were not affected by increasing LSO percentages in the diets. The n‐6 polyunsaturated fatty acid ( PUFA ) concentration increased with increasing LSO levels in the diets. In contrast, the n‐3 PUFA levels decreased with increasing LSO levels in the diets. The liver and muscle were used for the analysis of fatty acids. The highest level of eicosapentaenoic acid ( EPA ) and docosahexaenoic acid ( DHA ) concentrations was recorded in fillet of fish fed the FO diet and the lowest in those fed the 50 LSO diet. However, EPA and DHA ratios in the liver of fish fed the 75 LSO diet were higher than those in fillet of fish fed the FO and 50 LSO diets. No significant differences were seen in fatty acid composition between the dietary groups ( P > 0.05). Based on the results of growth performance and fatty acid composition of the experimental fish in this study, it can be concluded that the 75% concentration of laurel seed oil performed best among the diets tested in the experiment.