Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/28991
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Appearance of systemic granulomatosis is modulated by the dietary supplementation of vitamin E and C in meagre (Argyrosomus regius) larvae fed inert microdiets
Other Titles: Supplementation of vitamin E and C prevent granulomatosis in meagre larvae
Author(s): Ruiz, Miguel Angel
Hernandez-Ruiz, Carmen Mari
Caballero, Maria Jose
Fernandez-Palacios, Hipolito
Saleh, Reda
Izquierdo, Marisol S
Betancor, Monica B
Contact Email: m.b.betancor@stir.ac.uk
Keywords: meagre larvae
antioxidant vitamins
granulomatosis
Issue Date: 15-May-2019
Citation: Ruiz MA, Hernandez-Ruiz CM, Caballero MJ, Fernandez-Palacios H, Saleh R, Izquierdo MS & Betancor MB (2019) Appearance of systemic granulomatosis is modulated by the dietary supplementation of vitamin E and C in meagre (Argyrosomus regius) larvae fed inert microdiets [Supplementation of vitamin E and C prevent granulomatosis in meagre larvae]. Aquaculture, 506, pp. 139-147. https://doi.org/10.1016/j.aquaculture.2019.03.032
Abstract: Systemic granulomatosis has already been reported in meagre larvae with an adequate feeding protocol and enrichment media preventing its appearance in the first weeks of life. Afterwards, the control of this disease could be prevented through nutritional components of the inert food, being the antioxidants the key to success. For this reason, in the present study, meagre larvae were reared from 30 days post hatching (dph) with five isonitrogenous and isolipidic experimental microdiets with different levels of vitamin E and C: C- (40 mg kg-1 E, 100 mg kg-1 C), C+ (400 mg kg-1 E, 1,000 mg kg-1 C), Krill (400 mg kg-1 E, 1,000 mg kg-1 C and substitution of fish oil by krill oil), EC (200 mg kg-1 E, 500 mg kg-1 C) and EECC (800 mg kg-1 E, 2,000 mg kg-1 C). Prior to this, larvae were co-fed with rotifers and Artemia following a protocol which prevented the appearance of granulomas, as previously demonstrated. The substitution of fish oil by krill oil significantly increased levels of eicosapentaenoic acid (EPA, 16.6 %) and docosahexaenoic acid (DHA, 17.6 %) in meagre, consequently increasing the peroxidation index, which in turn translated into a higher incidence of granulomas. Although even low levels of vitamin E and C (40 mg kg-1 E, 100 mg kg-1 C; C-) allowed the adequate growth of larvae, these levels were not enough to prevent the appearance of granulomas, requiring superior levels of both antioxidant vitamins (800 mg kg-1 E and 2,000 mg kg-1 C) to mitigate systemic granulomatosis. This mitigation was simultaneous with the reduction of thiobarbituric acid reactive substances TBARs content in larvae, which were highly correlated with the appearance of granulomas (R2=0.892, y=0.0446x+0.0756). A strong negative correlation was observed between the dietary levels of vitamin E (y = -0.0098x + 11.174, R2 = 0.8766, p value = 0.019, r = -0.93) and vitamin C (y = -0.0022x + 6.4777, R2 = 0.9278, p value = 0.003, r = -0.96) and the percentage of larvae with granulomas. The results showed that the occurrence of systemic granulomatosis seems to be associated to the larvae peroxidation status, so that high dietary levels of vitamin E and C (800 and 2,000 mg kg-1, respectively; Diet EECC), reduced lipid peroxidation and completely prevented the appearance of granulomas in meagre larvae at 44 dph.
DOI Link: 10.1016/j.aquaculture.2019.03.032
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: Ruiz MA, Hernandez-Ruiz CM, Caballero MJ, Fernandez-Palacios H, Saleh R, Izquierdo MS & Betancor MB (2019) Appearance of systemic granulomatosis is modulated by the dietary supplementation of vitamin E and C in meagre (Argyrosomus regius) larvae fed inert microdiets [Supplementation of vitamin E and C prevent granulomatosis in meagre larvae]. Aquaculture, 506, pp. 139-147. DOI: https://doi.org/10.1016/j.aquaculture.2019.03.032 © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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