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Last update: May 2021

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tél : +33 (0) 5 59 51 59 51
fax : +33 (0) 5 59 54 51 52

Jérôme Roy

Jérôme Roy
Regulation of feeding behavior

Contact | Cursus and training | Current research topics | Publications

Contact

UMR1419 NuMéA (Nutrition, Métabolisme, Aquaculture)
Quartier Ibarron
64310 St Pée-sur-Nivelle, France
Tel : +33 (0)5 59 51 59 65
Fax: +33 (0)5 59 54 51 52
Courriel : jerome.roy@inra.fr
Research gate profil: https://www.researchgate.net/profile/Jerome_Roy4

Cursus and training

•    2018-present: Research Scientist, INRA, UMR 1419 NuMéA, France.
•    2016-2018: Postdoctoral Research fellowship, CRCHUM, Montréal, Canada. Financement : FRM (France), FRSQ (Canada).
•    2016 : Assistant Researcher and teacher, UMR INSERM 1046 CNRS 9214, & Université de Montpellier, France.
•    2015: PhD in Biology, UMR INSERM1046 CNRS9214, & Montpellier University, France. Antiarrhythmic properties of oxygenated by products of long chain poly-unsaturated fatty acids.
•    2012: Master in Biology, Physiology, Molecular and Cellular Pathology, Poitiers university, France.
•    2010: Licence degree’s in Animal physiology and neuroscience, Poitiers university, France.

Current research topics

In 2014, aquaculture provided for the first time half of the fish that were consumed worldwide. Thus, to cope of growing booming of aquaculture and to fit with environmental and ecological impacts, social and economic sustainability of the aquaculture, the traditional majors ingredients of aquafeed, fishmeal (FM) and fish oil (FO), must be replaced by renewable and alternative sources like terrestrial plants products. However, after twenty years of research, the total replacement of marine products by use of plant products is not achieved and has several disadvantages. In rainbow trout (Oncorhynchus mykiss), a carnivorous species, the concomitant replacement of dietary FM and FO with vegetable ingredients, led to drastically altered fish growth performance and survival rate (4), poorer reproduction performance, first spawning and offspring survival. In addition, one of the main problems of extensive use of plant-based diet is an unfavorable modification of the fatty-acid composition of farmed fishes particularly of ω-3 long chain polyunsaturated fatty acids (ω-3 LC-PUFAs), such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), essential fatty acids known to have beneficial health effects for human and mainly provided by fish consumption. Indeed, modern, sustainable aquafeeds contain increasing levels of terrestrial agriculture alternatives that contain no ω-3 LC-PUFAs, which has translated into a substantial reduction (by 50% over the last decade) in the content of ω-3 LC-PUFAs in the flesh farmed fishes. To date, numbers of studies that have investigated the impact of total substitution of FM and FO with alternative terrestrial products have focused their scope on fish performance, metabolism and functional genomic. However, in farmed fishes, qualitative (nutrient type) and quantitative (consumption) feeding is essential for adequate growth, survival and reproduction. In this way, ω-3 LC-PUFAs are also known to be essential for fish life cycle, to promote optimal growth and survival, health, reproduction and offspring development. Moreover, alternative ingredients, those containing no ω-3 LC-PUFAs are known to impact feeding of farmed fishes by reducing swimming activities, feeding rhythms, behavioral development (schooling), and increased abnormal behavior.                                      

Altogether, in the current state of the knowledge, understanding feeding behavior involving physiological and molecular mechanisms regulating feed intake of farmed fishes face to their diet will provide extensive information about how ingredients are perceived by fishes during all life cycle to enhance feed conversion efficiency and reduce nutrient losses, key elements in fish farming. Theses knowledges will provide to find appropriate alternative ingredients to sustainably promote growth aquaculture while improving fish growth, survival rate, reproduction and health performance while meeting humans nutritional requirements.

In this context, the origin and mechanisms which explained drastic alteration of fish fed with plant-based diet, and the impact of ω-3 LC-PUFAs absence in the composition of terrestrial products on food intake regulation and their consequence (growth, survival, reproduction) has not been studied to date. In this context, my research project is hypothesized that the alteration of growth, survival rate and reproduction of rainbow trout fed with total plant-based diets could be explained by the modification of feeding behavior due to the absence of lipids, especially ω-3 LC-PUFAs.

The principal objective of my research project aims to understand the alteration of trout performance regarding total plant-based diet by ω-3 LC-PUFA by identifying the molecular status and mechanisms of organs known to be involved in the control of feeding behavior in animal: central nervous system and lingual system

A recent published experiment performed in the unit revealed that ω-3 LC-PUFA (DHA and EPA) drove the feeding behavior of juvenile rainbow trout. We observed that fish could make a difference between diets containing different levels of ω-3 LCPUFA and preferred diets highest in ω-3 LCPUFA. This study highlighted the influence of ω-3 LCPUFA in the feeding behavior of juvenile rainbow trout. This experiment confirms the initial hypothesis and opens interesting perspectives for studies on feed intake regulation and mechanisms associated with this food preference.

Sélection de Publications

•    Roy, J., Mercier, Y., Tonnet, L., Burel, C., Lanuque, A., Surget, A., Larroquet, L., Corraze, G., Terrier, F., Panserat, S., Skiba, S. (2019). Rainbow trout prefer diets rich in omega-3 long chain 6 polyunsaturated fatty acids DHA and EPA. Physiology and behavior, in press.