Abstract
Eutrophication results in a deficiency of n-3 LC-PUFA (long-chain polyunsaturated fatty acids) in aquatic food chains, affecting fish nutrition and physiology. The trophic transfer of FA (fatty acids) to fish species of different feeding habits was investigated in two reservoirs in southeast Brazil—the mesotrophic Ponte Nova Reservoir (PN) and the hypereutrophic Billings Reservoir (Bil). Total FA profile of stomach contents and adipose tissue, triacylglycerols (TAG), and phospholipids (PL) from liver and muscle of the omnivorous Astyanax fasciatus and the carnivorous Hoplias malabaricus were analyzed by gas chromatography. A prevalence of n-6PUFA, as 18:2n-6 (linoleic acid) and 20:4n-6 (arachidonic acid, ARA) was observed in the stomach contents and in the tissues of A. fasciatus from the PN reservoir. In contrast, n-3 LC-PUFA, as 20:5n-3 (eicosapentaenoic acid, EPA) was accumulated in fish tissues from Bil, resulting in higher n3/n6 and EPA/ARA ratios, compared to fish from PN. This differential FA accumulation was also observed for H. malabaricus, but differences were slightly minor, and no changes were observed in the EPA/ARA ratios between fish from both reservoirs. Regardless reservoir, FA profiles of TAG resembled that of their diet, whereas FA profiles of PL were more conservative and mainly comprised by LC-PUFA. We conclude that reservoir trophic status affected the FA composition of food resources available to these fish species, resulting in differential allocation of n-3 and n-6 FA. As expected, FA profile of the investigated fish species also reflected their feeding habit and physiological demands.
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Abbreviations
- 18-PUFA:
-
Polyunsaturated fatty acid with 18 carbons
- LC-PUFA:
-
Long-chain polyunsaturated fatty acid (with 20-22 carbons)
- Af:
-
Astyanax fasciatus
- ARA (20:4n-6):
-
Arachidonic acid
- AT:
-
Adipose tissue
- BFA:
-
Branched chain fatty acids
- Bil:
-
Billings (hypereutrophic reservoir)
- DHA (22:6n-3):
-
Docosahexaenoic acid
- EPA (20:5n-3):
-
Eicosapentaenoic acid
- FA:
-
Fatty acids
- FAME:
-
Fatty acid metil-esters
- Hm:
-
Hoplias malabaricus
- HPL:
-
Hepatic phospholipids
- HTAG:
-
Hepatic triacylglycerols
- MPL:
-
Muscle phospholipids
- MTAG:
-
Muscle triacylglycerols
- MUFA:
-
Monounsaturated fatty acids
- n-3:
-
Omega 3
- n-6:
-
Omega 6
- OFA:
-
Odd chain fatty acids
- PL:
-
Phospholipids
- PN:
-
Ponte Nova (mesotrophic reservoir)
- PUFA:
-
Polyunsaturated fatty acids
- SC:
-
Stomach content
- SDA:
-
Stepwise discriminant analyses
- SFA:
-
Saturated fatty acids
- TAG:
-
Triacylglycerol
- TSI:
-
Trophic state index
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Acknowledgments
The present study was funded by the Fundação de Incentivo à Pesquisa do Estado de São Paulo (FAPESP) (Research Grant: 2012/50371-2; Ph.D. scholarship: 2010/50555-0) and by the Comissão de Aperfeiçoamento de Pessoal do Nível Superior (CAPES). The authors would like to thank the fishermen Evaldo Bizarrias and Milton Nunes de Santana and the LAMEROA team, for their help in fish collection, and IB/USP for providing logistics and facilities for collection.
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Gomes, A.D., Tolussi, C.E., Boëchat, I.G. et al. Fatty Acid Composition of Tropical Fish Depends on Reservoir Trophic Status and Fish Feeding Habit. Lipids 51, 1193–1206 (2016). https://doi.org/10.1007/s11745-016-4196-z
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DOI: https://doi.org/10.1007/s11745-016-4196-z