Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 538536
Title Effects of dietary supplementation of Gracilaria sp. extracts on fillet quality, oxidative stress, and immune responses in European seabass (Dicentrarchus labrax)
Author(s) Peixoto, Maria J.; Magnoni, Leonardo; Gonçalves, José F.M.; Twijnstra, Robert H.; Kijjoa, Anake; Pereira, Rui; Palstra, Arjan P.; Ozório, Rodrigo O.A.
Source Journal of Applied Phycology (2018). - ISSN 0921-8971 - 10 p.
DOI https://doi.org/10.1007/s10811-018-1519-x
Department(s) WIAS
LR - Animal Breeding & Genomics
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Dicentrarchus labrax - Dietary seaweed supplementation - Fillet quality - Fish welfare - Gracilaria sp. extract - Rhodophyta
Abstract

The current study evaluated the effects of two different fractions derived from the methanolic extraction of the red seaweed Gracilaria sp. supplemented in European seabass (Dicentrarchus labrax) diets. With that purpose, three experimental diets were prepared: a basal diet (control), a control supplemented with the methanolic extract (GE, 0.5% diet) and a control supplemented with the insoluble residue of the GE extraction (GR, 4.5%). Seabass with an average initial weight of 16.5 ± 0.6 g were fed the experimental diets for 42 days, and the following parameters were evaluated: growth indicators, digestive enzyme activities, immune and oxidative stress responses, fillet pH and color (L*, a*, and b* values), and skin color. The dietary supplementation of GE or GR had no effect on growth performance, digestive enzyme activities, fillet pH, and color. Skin color was significantly lighter (L*) in fish-fed GE (83.9 ± 1.9) and GR (84.3 ± 2.3) diets when compared with the control group (81.9 ± 3.8). The dietary treatments did not affect the oxidative stress biomarkers. Alternative complement pathway (ACH50) was significantly higher in fish-fed GE diet (168.2 ± 13.4 EU mL−1) than in the control diet (113.1 ± 31.4 EU mL−1). No dietary effect was observed on peroxidase and lysozyme activities. The current study indicates that dietary supplementation of Gracilaria sp. methanolic extracts may have little influence on the innate immune system and skin color in seabass.

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