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Rama Bangera representing Akvaforsk Genetics at LACQUA 2018 in Bogota

LACQUA18 will be the 2018 Annual meeting of the Latin American & Caribbean Chapter of WAS. Following upon the previous successful LACQUA meetings, LACQUA will bring international attention to the aquaculture industry of Colombia and South America. The conference will celebrate the fact that aquaculture is one of the most important food production industries in the world.

Senior Geneticist, Rama Bangera is representing Akvaforsk Genetics at LAQUA 2018 in Bogota this year. He has more than seven years of experience from applied breeding programs in several cold water and warm water fish species, including salmonids, Atlantic cod and tilapias. Rama holds a doctorate in Animal Breeding and Genetics from the Norwegian University of Life Sciences, with his PhD work concentrated on genetics aspects of disease resistance in Atlantic cod.

Rama is going to hold presentation and will talk about heritability estimates for early mortality syndrome and genetic correlation with harvest weight in pacific white shrimp Penaeus vannamei.

The aim of this work was to estimate genetic parameters for resistance to EMS and genetic correlation with harvest weight. The data recorded as binary survival status (dead/alive; BS) at the end of the test and time-until death (in days; DAY) from 2350 shrimp juveniles (198 families from 115 sires and 192 dams) from two different batches, challenge tested with Vibrio sp. A mild challenge test was conducted to achieve intermediate mortality to be able to identify genetic variability.

The overall mortality at the end of the test was 53 %. Harvest weight (HWT) records were available with full-pedigree from all the generations. The genetic parameters for BS and DAY was estimated with a univariate sire-dam threshold model and sire-dam linear model, respectively. Similar bivariate models were used to estimate genetic correlation between these traits and HWT.

Heritability estimates were moderate for both BS (0.39 ± 0.07) and DAY (0.45 ± 0.06). The across generation heritability estimate HWT was also moderate (0.36 ± 0.02). The genetic correlation between either of the two EMS traits (BS and DAY) and HWT (- 0.15 ± 0.11 and -0.17 ± 0.10, respectively) was slightly negative, but not significantly different from zero. The results indicate that there is a good prospect for improving EMS resistance through selection in Genetica Spring’s breeding program, without adverse effect on selection for growth traits. Advanced genomic tools are currently being developed in the program, facilitating implementation of marker assisted selection based on quantitative trait loci and genomic selection for increased efficacy.

Laqua 2018
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