Benchmark Genetics offers sea lice robust fish using GS, a program that started in 2015. Before the implementation of GS, the company has been selecting for sea lice resistance based on family levels since 2007. By moving from family-based breeding to GS, we were able to increase more than three times the genetic gain in our nucleus. Benchmark Genetics is currently working on novel approaches for identifying and selecting the most robust animals.
Together with Nofima, we investigated SalmoBreed families with high and low estimated breeding value (GEBV) for sea lice resistance. Families divergently selected for sea lice resistance shows significant phenotypic differences in sea lice attachment under test models, validating a realized response to selection.
The performance of SalmoBreed families were tested under two conditions.
- Mixed rearing of divergent high and low GEBV sea lice resistant families
- Separate rearing of GEBV sea lice resistant families.
Under mixed rearing low GEBV families showed a significantly reduced lice attachment and performed consistently well under separate rearing. When we reared the low GEBV families, that were predicted to get low lice attached during the challenge(alone in one tank), with the same amount of lice pressure as the mixed tanks, the lice numbers remained low