Applied breeding in aquaculture is an area of intense activity. The Australian farmed barramundi sector now has sufficient scale to justify the development of family-based breeding. We describe genetic parameter estimates obtained using animals raised in Australia’s Northern Territory. Progeny were generated by group spawning which is common practise for the species. Animals were raised under commercial pond conditions before growth was measured as harvest weight at 9 months (11,677 fish) and 15 months of age (3,068 fish). Pedigree was assigned using a SNP based genotyping tool before the dataset was used for heritability estimation. We found heritability for both traits was moderate, with growth to 9 months (WT_9; h2 = 0.29 +/- 0.05) slightly higher than for older fish (WT_15; h2 = 0.23 +/- 0.07). This is in line with previously published estimates for growth traits across tank and sea cage production systems. We also estimated the genetic correlation between traits (rg) using a bivariate quantitative genetic model. The age – age weight correlation was moderately positive (rg = 0.41 +/- 0.19), suggesting the two traits have common and also distinct gene drivers. Finally, we compared estimated breeding values for broodstock drawn from different sources. This revealed the average EBV for WT_9 was highest for animals selected from within the production system when compared with broodstock from elsewhere or wild caught fish. The results offer promise for future genetic gain for growth in this important aquaculture species.