YC19 TAS Broodstock
Year Class in Review
58 YC19 families were produced at IMAS Taroona from 24/09/2019 - 31/10/2019 using YC16, YC17 and YC18 broodstock. The YC19 breeding season was difficult as there were issues in the IMAS-ASI Biosecurity Facility (or as known as the “ASI hatchery”) for the first time in many years and this resulted in a lower number of families being produced and a later than anticipated deployment. This was due to a large number of ciliates entering the IMAS bag system, which affected the ASI spat survivability. Despite these issues we were still able to produce 58 families which were deployed from mid-January 2020 for POMS exposure trials at Pitt Water.
A thorough review of the problems encountered has been conducted by IMAS including recommended changes for the upcoming season, including incorporating better hygiene measures in the algae room. Currently, 92,378 oysters have been measured with more performance test data (meat condition, shape, and growth) underway in the coming months over multiple sites.
EBV + Inbreeding Values
The top ten POMS resistant families were made available for commercial allocations in November 2020.
There were three POMS trials deployed in upper Pitt Water. The environmental conditions over the summer period with relatively cool temperatures resulted in very low level and sporadic POMS activity in upper Pitt Water. We were able to get a mild POMS hit on one YC19 ASI trial. The first trial, 19PW1, did not appear to get a POMS hit and we should assume the mortality was not caused by POMS. That is based on the low heritability and the absence of any correlation with this trial and other YC19 trials, or any other YC trials.
The second and third trials appear to have had what we called a “light POMS hit” based on the terminology we used last year’s trials. These trials had a moderate heritability, which was lower than all last year’s trials, and that will impact on gains. The result is that we have been able to calculate POMS EBV’s for this year class using 19PW2 and 1PW3 although the low-level POMS activity means that we do not have heavy within family selection.
The button below takes you to a separate CSIRO website which allows hatcheries to calculate inbreeding/EBV values. For further questions, please refer to FAQ's page or contact the General Manager, Matt.
YC19 SA Broodstock
EBV + Inbreeding Values