Abstract
This experiment was conducted to study the effect of altering the linoleic acid (LA) and linolenic acid (LNA) levels and ratios in the diet of Nile tilapia (Oreochromis niloticus) on fry performance. Twelve diets were formulated to be isonitrogenous, isocaloric, and differed only in their main lipid source. An oil rich in n-3 fatty acids [linseed oil (L)] and two oils rich in n-6 fatty acids [soybean oil (S) and corn oil (C)] were added at 6% of the basal diet either separately or in equal combinations (L1:S1 or L1:C1 or S1:C1) or at ratio 2:1 (L2:S1 or L2:C1 or C2:L1 or C2:S1 or S2:L1 or S2:C1). The fish were fed twice daily (09 and 16 h) to apparent satiation throughout the duration of the trial (16 weeks). Survival rates increased in a linear pattern with increasing the LA level in the diets (R 2 = 0.764). Final body weight was significantly higher in fish fed S, S2:L1, and L2:C1 diets, being 14.29, 14.14, and 14.09 g/fish, respectively. However, tilapia fed C, S1:C1, and C2:S1 diets exhibited low final body weight (11.41, 11.60, and 11.76 g/fish, respectively). The final body weight was negatively affected by increasing the LA/LNA ratios (R 2 = 0.647). Either LA or arachidonic acid (%) in the whole body of fish increased in a linear patterns (R 2 = 0.641 and 0.746, respectively) with increasing dietary LA. Besides, LNA, eicosapentaenoic, acid and docosahexaenoic acid (%) in the whole body increased in a linear pattern (R 2 = 0.777, 0.501, and 0.8148, respectively) the increasing dietary LNA level. The present study indicated that LA/LNA ratio less than 13 is recommended for nutrition of tilapia fry.
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Abbreviations
- LA:
-
Linoleic acid
- LNA:
-
Linolenic acid
- ARA:
-
Arachidonic acid
- DHA:
-
Docosahexaenoic acid
- EFA:
-
Essential fatty acids
- EPA:
-
Eicosapentaenoic acid
- HUFA:
-
Highly unsaturated fatty acids
- Mt:
-
Metric tons
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El–Husseiny, O.M., Abdul-Aziz, G.M., Goda, A.M.A.S. et al. Effect of altering linoleic acid and linolenic acid dietary levels and ratios on the performance and tissue fatty acid profiles of Nile tilapia Oreochromis niloticus fry. Aquacult Int 18, 1105–1119 (2010). https://doi.org/10.1007/s10499-010-9327-6
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DOI: https://doi.org/10.1007/s10499-010-9327-6