probiotic combination drastically improves oyster larvae survival
Credit: Oregon State University

Oyster larvae survival rates were significantly boosted by treating them with specific combinations of probiotics, Oregon State University researchers found in a recent study published in Aquaculture.

With only a one-time application, the probiotics also boosted larval growth, metamorphosis and settlement, meaning that in addition to more oysters surviving past the larvae stage, they also fared better at transitioning to juveniles and anchoring to shells and other surfaces.

The findings could be a major boon to oyster farms where pathogens can kill off a whole season’s worth of larvae, costing hundreds of thousands of dollars at a time.

“The results definitely exceeded our expectations,” said Carla Schubiger, project leader and co-author on the study and an assistant professor in OSU’s Carlson College of Veterinary Medicine. “Just a 40–50% improvement in larvae survival would be huge, but here we have over 80% increased survival at times. That’s very, very significant for the industry. Antibiotics are not allowed in hatcheries so this will be the first tool they can actually use to increase their production.”

Shellfish are big business in Oregon, and oyster sales account for close to $5 million annually, according to a 2010 report from the Pacific Coast Shellfish Growers Association.

In oysters as in humans, the organism’s overall function depends on help from good bacteria living within the host’s gastrointestinal tract. The goal of the study was to pinpoint which types of these beneficial bacteria were best at fighting off pathogenic bacteria that can kill oyster larvae.

The Vibrio coralliilyticus bacteria, in particular, is common in marine aquaculture and extremely pathogenic, so oyster farms need a cost-effective way to defend against it, the researchers said.

OSU researchers grew several strains of naturally occurring bacteria and screened them for their ability to fend of V. coralliilyticus under laboratory conditions. They then selected the strains that performed best against the pathogenic bacteria.

The team grew larvae in water conditions comparable to those used by oyster farms. When the larvae were 24 hours old, they were treated with the different strains of cultivated probiotics, first individually and then in combinations of the most promising strains. At 48 hours old, the larvae were exposed to V. coralliilyticus.

The results were striking. Compared with the untreated control group, four of the individual probiotic strains resulted in an average increased survival rate of 68% or better, including one strain that increased survival by 99.7%.

Researchers then treated larvae with combinations of the most promising individual strains. Different two- and three-strain combinations increased larval survival rates by up to 86%.

Fourteen to 16 days later, the probiotics appeared to still have an effect, with treated larvae displaying significantly higher rates of natural settlement and metamorphosis into adolescent oyster spat, along with significantly larger shells than the untreated larvae produced.

The exact mechanism that aided the oysters is unknown, but the improved growth and settlement rates were an unexpected perk on top of the improved survival rates, Schubiger said.

“It’s possible that we influenced something very early in their development, like the immune response, to make them do better later in life,” she said.

The research team envisions applying the probiotic treatment as freeze-dried material that can be sprinkled into the larvae spawning bucket. Treating the larvae so early in their life cycle means they only need a very small amount of material, making the probiotic treatment more cost-effective.

Their next steps will be to test a combination with a fourth probiotic and to work on growing the probiotic bacteria alongside the microalgae that serves as oyster larvae’s initial food source, so the treatment could be integrated into their spawning process from the very beginning, Schubiger said. More information: David Madison et al, A marine probiotic treatment against the bacterial pathogen Vibrio coralliilyticus to improve the performance of Pacific (Crassostrea gigas) and Kumamoto (C. sikamea) oyster larvae, Aquaculture (2022). DOI: 10.1016/j.aquaculture.2022.738611 Provided by Oregon State University Citation: Probiotic combination drastically improves oyster larvae survival (2022, September 27) retrieved 27 September 2022 from https://phys.org/news/2022-09-probiotic-combination-drastically-oyster-larvae.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

TECH NEWS RELATED

Robot suppliers continue capacity expansions in China despite instability, says DIGITIMES Research

China remains the largest manufacturing industry in the world, making its industrial robot market a segment full of potential. Although around 70% of industrial robot suppliers in China are not domestic companies, they continue expanding capacities in the country despite concerns toward China’s instability amid geopolitical and trade issues, ...

View more: Robot suppliers continue capacity expansions in China despite instability, says DIGITIMES Research

GF and Intel semiconductor talent forgo are gifts to competitors

Intel is offering voluntary unpaid leave for thousands of employees while GlobalFoundries (GF) is laying off 6% of its global workforce to reduce short-term costs amid an industry down cycle. They are probably doing competitors such as TSMC, Samsung, UMC, and Foxconn a favor. Financial Times reported that Intel ...

View more: GF and Intel semiconductor talent forgo are gifts to competitors

Vingroup partners Google Cloud to modernize group-wide SAP applications, accelerate global growth ambitions

Vingroup, Vietnam’s largest private conglomerate, has on Monday announced a strategic collaboration with Google Cloud to modernize and connect its critical systems and data at a group-wide level. This reaffirms Vingroup’s commitment toward adopting best-in-class technologies to boost its production capabilities, improve product and service quality, enhance the customer ...

View more: Vingroup partners Google Cloud to modernize group-wide SAP applications, accelerate global growth ambitions

Researchers harness bacteria-eating viruses to create powerful food decontamination spray

Researchers tested their food-safe antibacterial spray on foods including beef and romaine lettuce. Credit: McMaster University Researchers at McMaster University have created a powerful new weapon against bacterial contamination and infection. They have developed a way to coax bacteriophages—harmless viruses that eat bacteria—into linking together and forming microscopic beads. ...

View more: Researchers harness bacteria-eating viruses to create powerful food decontamination spray

What does Polly say? Community science data reveal species differences in vocal learning by parrots

Credit: CC0 Public Domain While most animals don’t learn their vocalizations, everyone knows that parrots do—they are excellent mimics of human speech. But how large is the vocabulary of different parrot species? Do males “talk” more than females? Does a parrot’s vocabulary expand with age? A new study publishing ...

View more: What does Polly say? Community science data reveal species differences in vocal learning by parrots

Volkswagen faces growing backlash in China over malfunctioning software in ID Series

Every Wednesday and Friday, TechNode’s Briefing newsletter delivers a roundup of the most important news in China tech, straight to your inbox. Volkswagen faces a growing public backlash in China over malfunctioning software in its electric vehicle ID Series — including sudden black screens and frequent internet disconnection — ...

View more: Volkswagen faces growing backlash in China over malfunctioning software in ID Series

Apple suppliers expand investment in India, look to dial down China operations

Apple suppliers have upped investment in production in India in recent months as they look to diversify supply lines and expand in the country. In September, Indian firm Tata Group entered discussions with Taiwan-headquartered Apple supplier Wistron over the building of an iPhone assembly plant in India, according to ...

View more: Apple suppliers expand investment in India, look to dial down China operations

Putin ally Kudrin accepts tech giant Yandex's offer of advisory role

Reuters FILE PHOTO: Alexei Kudrin at the St. Petersburg International Economic Forum in Saint Petersburg, Russia June 17, 2022. REUTERS/Maxim Shemetov/File Photo Alexei Kudrin, a longtime ally of Russian President Vladimir Putin, said on Monday he would join technology giant Yandex to advise on corporate development as the company begins ...

View more: Putin ally Kudrin accepts tech giant Yandex's offer of advisory role

AirPods Pro 2 Deal at Amazon Brings Back Black Friday Pricing Ahead of the Holidays

Powerful New Weapon Against Contamination and Infection – Food Spray Deploys “Billions of Tiny Soldiers”

What Is DataOps?

Meta to jointly invest with Airtel in telecom infrastructure

iQOO 11 series launching in China on December 8 alongside iQOO Neo 7 SE

NASA Artemis I: Orion Spacecraft Experiencing Power Issues

The first complete picture of Arctic sea ice freeze-thaw cycle highlights sea ice response to climate change

Vivo Y02 launched in India with MediaTek SoC, 5,000 mAh Battery, Android 12 Go Edition

Airtel-Meta to jointly invest in global network connectivity infra

Call of Duty: Modern Warfare 2 (PC) Review: The Campaign takes the cake for once

New Zealand's NZ Super Fund commits up to $70M to Movac's tech fund

Pedestrians choose healthy obstacles over boring pavements

OTHER TECH NEWS

Top Car News Car News