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Combined replacement of fishmeal and fish oil in European sea bass (Dicentrarchus labrax): Production performance, tissue composition and liver morphology
- Source :
- Aquaculture. 474:101-112
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- The aim of this study was to evaluate the combination of maximum replacement of fishmeal (FM) and fish oil (FO) by alternative meals (AM) and oils (AO) to develop nutritious, but more eco-friendly diets for European sea bass ( Dicentrarchus labrax ) juveniles. European sea bass of 9.8 ± 1.5 g and 9.1 ± 0.5 cm were fed nine isonitrogenous (45% crude protein) and isolipidic (21%) diets containing gradually reduced levels of FM and FO as follows (%FM/%FO): 58/15, 20/6, 20/3, 10/6, 10/3, 5/6, 5/3 and 0/0. Another diet, 0/0 + , was similar to the 0/0 but supplemented with LC-PUFA from microbial and marine sources. After 90 days of feeding, European sea bass fed the 0/0 diet showed reduced (P + diet). Reduction of FM/FO down to 5/3 did not significantly affect fish survival or condition factor, whereas reduction to 5/6 did neither affect sea bass length or feed conversion and reduction down to 10/3 did not affected body weight, DGI and perivisceral fat or visceral weight. FM reductions down to 5% significantly reduced growth rate. FO substitution by vegetable oils (VO) led to reduced growth and increased liver to body weight ratios, liver lipid deposition and hepatocellular size. In liver and muscle, FO substitution increased n-6 fatty acids (FA) and n-6/n-3 ratio and reduced saturated FA and n-3 LC-PUFA, whereas monounsaturated FA were not increased in proportion to dietary contents. Moreover, FO reduction increased the products from Δ6 desaturase and elongases, Elovl6 and Elovl5. In conclusion, the results of this study show that it is possible to reduce dietary FM and FO levels down to 10% and 3% in mostly plant-based diets without affecting growth performance of European sea bass juveniles.
- Subjects :
- 0301 basic medicine
Liver morphology
04 agricultural and veterinary sciences
Aquatic Science
Biology
Fish oil
biology.organism_classification
Feed conversion ratio
Condition factor
03 medical and health sciences
030104 developmental biology
Fish meal
Animal science
Biochemistry
040102 fisheries
0401 agriculture, forestry, and fisheries
Dicentrarchus
Sea bass
Tissue composition
Subjects
Details
- ISSN :
- 00448486
- Volume :
- 474
- Database :
- OpenAIRE
- Journal :
- Aquaculture
- Accession number :
- edsair.doi...........0272992b00e8622bb821f9fccc185c44