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Currently Benchmark selects broodstock for improved resistance to Streptococcus agalactiae using genomic selection

Benchmark announces 'major step forward' in combating tilapia disease

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Friday, July 12, 2019, 00:20 (GMT + 9)

Benchmark announces the discovery of a significant quantitative trait locus (“QTL”) for Streptococcus iniae resistance.

Streptococcus infections are among the most critical disease challenges in tilapia production and this technological breakthrough presents a significant opportunity for the industry to reduce streptococcus infections and the use of antibiotic treatments.

Benchmark’s genomic analysis from controlled disease resistance trials has shown that a significant proportion of the genetic variation for resistance is caused by a small region of DNA – a Quantitative Trait Locus or QTL. Benchmark has made a patent application in relation to its discovery.

Hybrid tilapia (Oreochromis spp.) naturally infected by Streptococcus agalactiae showing ocular opacity (thick arrow), caudal fin hemorrhage and erosion (arrow head), erosion of the skin (thin arrow), and abdominal distention) (asterisk).Photo: Wan Nurhafizah Wan Ibrahim  

The QTL identified will be used to select broodstock with high levels of Streptococcus iniae resistance for the production of commercial fry.  Currently Benchmark selects broodstock for improved resistance to Streptococcus agalactiae using genomic selection, and for resistance to Streptococcus iniae by Marker-Assisted Selection using the S. iniae QTL.

This is the first time that a significant QTL for disease resistance in tilapia has been identified and used for commercial breeding. It represents an important step forward in the genetic improvement of tilapia and in combating  its most pressing disease challenges. Benchmark’s commercial Spring TilapiaÒ fry will be available to producers during early 2020.

Malcolm Pye, CEO Benchmark commented:  “This is a major step forward for the tilapia industry. We have seen first hand how devastating Streptococcus is to the industry and with the introduction of this new technology we can drive significant productivity and sustainability improvements for our customers.”

"In arriving at this breakthrough our international teams of geneticists have transferred knowledge from our well-established breeding programmes in Atlantic salmon which has shown to be of great benefit to the tilapia industry."

Morten Rye , Genetics Director, Benchmark Genetics commented: “This breakthrough in tilapia genetics is the result of many years of investment and commitment to bringing state-of-the-art breeding technology to this important farmed species.

"Today global tilapia production exceeds 6 million tonnes and we believe that this breakthrough will allow the industry to continue to grow to produce more of this cost effective, high-quality, protein source for humanity. Benchmark’s Spring Genetics team is excited to be heralding in a new era in tilapia breeding."


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