Tuesday, May 22, 2018

23/05/2018: Microbial-based solutions for sustainable shrimp farming

by Lallemand Animal Nutrition, Blagnac, France

At the latest Asian-Pacific Aquaculture 2018 conference (APA 18) in Taipei, Taiwan, Lallemand Animal Nutrition, shared the results of new studies conducted in partnership with ShrimpVet Laboratory at Nong Lam University.

These studies encompass the development and evaluation of functional feed ingredients to help address important shrimp health issues such as Enterocytozoon hepatopenaei (EHP) challenge, or white feces syndrome (WFS), as well as the development of integrated bioremediation strategies for pond water management. They suggest different approaches to answer important issues of shrimp health, nutrition and management in a sustainable way.

Microbial-based functional ingredients for aquafeed: New perspectives
EHP is an intracellular parasite that targets the shrimp hepatopancreas and gut epithelial lining, causing stunted growth. It generates severe losses across Asia, either directly or in association with other pathogens.

The trial results were presented by Eric Leclercq, Ph.D., Aquaculture R&D and Technical Support Manager with Lallemand Animal Nutrition. The trial was conducted at ShrimpVet Laboratory in Ho Chi Minh City, Vietnam, on EHP-challenged juvenile whiteleg shrimp.

It evaluated a multi-strain yeast-based additive developed by Lallemand Animal Nutrition — YANG — with enhanced immune-modulating properties and binding activities against undesirable bacteria. YANG was fed for 14-days prior to the disease challenge and during the challenge period.

“With YANG, the pathogen load in the hepatopancreas, measured by qPCR, was reduced at all time points and by up to 64 percent at the peak of infection. As a result, the body weight of challenged shrimp was 7.9 percent higher thanks to, interestingly, a much-reduced prevalence of severely compromised animals” Dr Leclercq explained. “YANG, applied preventively and over an EHP challenge period, can thus help contribute to reducing the severity of the EHP outbreak and related loss of growth. Importantly, ‘runt’ shrimp typically act as disease reservoir, so reducing their prevalence can help safeguard the crop to harvest,” he concluded.

As with EHP, White Feces Syndrom (WFS) is a pathology that strongly affects shrimp growth and FCR, but also survival. The infectious nature of the disease, and development of a challenge model, were only recently described by Professor Loc Tran from ShrimpVet Laboratory. The trial presented at APA 2018 aimed at assessing the potential of YANG to help mitigate the severity and impact of the syndrome, using the recently available WFS challenge model.

Results indicated a lower prevalence of gross syndromes at the peak of infection, a lower loss of body-weight and a clear trend towards a higher survival. This highlights for the first time, thanks to YANG unique properties, the potential of a microbial-based solution as part of an integrated management program to support good health and performance under these conditions.

Read the full article, HERE.

Visit the Lallemand Animal Nutrition website, HERE.

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