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In situ fatty acid production supports shrimp yields in diets lacking fish oil and fishmeal
Hermsen, D.; Van de Waal, D.B.; Declerck, S.A.J.; Verreth, J.A.J.; Verdegem, M.C.J. (2021). In situ fatty acid production supports shrimp yields in diets lacking fish oil and fishmeal. Aquacult. Nutr. 27(2): 506-518. https://dx.doi.org/10.1111/anu.13202
In: Aquaculture Nutrition. Blackwell Science: Oxford. ISSN 1353-5773; e-ISSN 1365-2095
|   |
| Trefwoorden |
Penaeus vannamei Boone, 1931 [WoRMS]
Marien/Kust |
| Author keywords |
DHA; EPA; fish oil; fishmeal; Litopenaeus vannamei; mesocosm; omega-3 fatty acids |
| Auteurs | | Top |
- Hermsen, D.
- Van de Waal, D.B.
- Declerck, S.A.J.
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- Verreth, J.A.J.
- Verdegem, M.C.J.
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| Abstract |
Using capture fishery-derived fish oil and fishmeal in aquafeeds is unsustainable. This study mimicked semi-intensive shrimp ponds, including primary producers, in mesocosm tanks. Fatty acid mass balances were computed to distinguish between diet-based and primary production-based LC-PUFA contributions to shrimp (Litopenaeus vannamei) production and meat quality. Performance and body fatty acid composition were compared of shrimp fed a commercial diet containing fish oil and fishmeal (control), with a fishmeal- and fish oil-free diet (low LC-PUFA diet: LOW). Six mesocosms were each stocked with 60 juvenile shrimp and randomly assigned to the two diets. After an 8-week grow-out period, biomass production, survival and proximate body composition were similar between diets. Control shrimp contained twice as much LC-PUFA and omega-3 fatty acids than LOW shrimp. Large quantitative losses (85%) were found in both treatments of the LC-PUFA-precursors alpha-linolenic acid (ALA) and linoleic acid (LA) that were being used as energy source by the shrimp instead for LC-PUFA synthesis. Whereas losses were also observed for eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in the control group, there was a gain for these components in the LOW tanks. LOW shrimp sourced at least 32% of their total EPA gain and 15% of their total DHA gain from the algal-based food web. This quantitative analysis of the fate of major dietary fatty acids strongly suggests that the pond's primary production can provide shrimp additional LC-PUFA. Finding a balance between LC-PUFA contribution through formulated feed and natural production seems possible and deserves further research. |
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