in fishmeal and fish oil substitution and sustainability
are fewer and fewer marine resources, and to reduce the impact of aquaculture on the environment, it is necessary to obtain
new raw materials to limit the use of fishmeal and fish oil in fish feed. Le Gouessant is a member of research programs that
study new raw materials as substitutes, such as algae, insects, crops and yeast. Specific parameters studied include: physiological
feed efficiency of the fish, taste effects of fish flesh, effects on fish health, technological feasibility of extrusion of
these ingredients and impacts on the environment - life cycle analysis. Results of these topics will be presented.
his master's degree in Oceanography at Agrocampus Rennes, Yann Marchand worked as a multi species nutritionist for three years.
In 2001, he joined Brittany Cooperative, Le Gouessant as aquaculture nutritionist, where he is now leading nutrition, formulation
and R&D, for the aquaculture division. Le Gouessant aquaculture produces more than 200 tailor made feeds, amounting to
25,000 tons of feeds each year.
Plant extract standardization for aquaculture feeds
made of plant extracts are increasingly available on the market, making it a challenge to to discriminate between them. This
presentation will discuss the diversity hidden behind the expression “plants extract” and the way research and
development can support the development of standardized, sustainable and reliable feed additives for aquafeeds. Examples will
be taken from the scientific literature and from the NOR-FEED experience to underline the importance of in depth knowledge
of plant extract composition to understand their mode of action through in vitro, ex vivo and in vivo trials.
Guillaume Le Reste
Le Reste has been involved in shrimp and fish feed additives development and aquafeeds formulation for a decade. He joined
NOR-FEED years ago to take part in their ambitious plans to adapt their products to the aquaculture market. After a first
job as a country manager for a feed formulation software developer in Brazil, he worked for a French feed service company
dedicated to aquaculture where he was in charge of additives and premixes development and customer care in Asia, Africa, Europe
and South America. His job is to help the company’s partners in their use of its range of product in aquaculture
products application in aquaculture, in the context of low fishmeal diets
meet the decreasing availability of traditional aquafeed ingredients of (fishmeal and fish oil), the development of the aquaculture
sector requires new ingredient sources and an evolution of the formulas. As such, plant ingredients are nowadays being commonly
incorporated in fish feed formulas. However, inclusion of high levels of plant ingredients is still challenging, due to negative
impacts on feed intake, perturbations of metabolic and health status, and growth performance slowdown. Yeast products, rich
in proteins, could be an alternative solution to be used as a protein source, complementing plant ingredients or to be used
as functional additives to counteract detrimental effects of plant proteins on fish and shrimp growth performance and immune
Dr. Nadège Richard conducted her PhD within the UMR INRA Nutrition and Metabolisme in Aquaculture in France.
During her PhD thesis, she examined the impact of dietary fish oil replacement by vegetable oils on growth performance and
lipid metabolism in trout and seabass. Then she spent nine years at the Marine Sciences Center in Portugal as a researcher.
There, her research activities focused on the influence of nutrition on fish performances and metabolism, during larval and
on-growing developmental stages of marine fish, using transcriptomic and proteomic approaches. She has been R&D Manager
for Aquaculture at Phileo by Lesaffre since 2016, where she coordinates projects aimed at developing new products and solutions
to improve fish and shrimp health management, growth performance and rearing conditions during the entire farming cycle.
Tools to evaluate aquafeeds
The current drive for sustainability in the aquaculture industry has pushed feed formulators
to replace fish meal and fish oil with alternative protein and oil sources, often of plant origin. However, this replacement
often affects digestibility and retention of nutrients, and has therefore major impact on performance. Therefore, the quantitative
assessment of the effects of these changes in feed formulations on fish performance, feed costs, consumer-value, and the environmental
impact of aquaculture is paramount. Such assessment can be done through lab analytics, digestibility trials, growth trials
and modelling tools. This presentation will present pros and cons of these approaches.
is co-founder, CEO and R&D director at SPAROS Lda, a research-driven company developing innovative Solutions for fish
nutrition. He obtained his MSc in Aquatic Sciences at ICBAS/Porto University (Portugal), MSc in Aquaculture and PhD
in fish nutrition both at Wageningen University (The Netherlands). He held positions as post-doc at SINTEF Aquaculture
(Trondheim, Norway) and CCMAR / University of Algarve (Faro, Portugal). He has 20 years’ experience in coordinating
R&D projects and PhD students in sustainable aquaculture and fish nutrition. He also participates in R&D and training
projects involving fish nutrition in Norway, Spain, Vietnam, Brazil and Denmark.
Optimising feeds for Recirculating Aquaculture Systems (RAS)
Recirculating aquaculture systems (RAS) are land-based aquaculture facilities that reuse
water by cycling it through a filtration system so it can be used again. The number of RAS-based facilities has grown exponentially
and more are being implemented worldwide, year after year. The increased use of RAS represents a paradigm shift for aquaculture
as they are becoming the standard, not only for early stages in freshwater, but the entire life cycle for many species. Feed
is the primary external input to recirculating aquaculture systems. It is therefore essential to design the feed correctly,
as in RAS, we are not only feeding the fish, but also feeding the system.
Saravanan has been interested and involved in aquaculture
for more than 15 years. He has extensive knowledge in fish and shrimp nutrition and their various farming systems. He holds
bachelor degree in Aquaculture & Fisheries, master degree in Fish Nutrition from CIFE (Mumbai, India), and earned his
PhD in Fish Nutrition from Wageningen University (The Netherlands) and INRA (St-Pée, France). In his current role as
global product group manager at Skretting (global), his focus is to develop and deliver high performance feeds for salmonid