Snapshots of coherent vortices represented in the normalized second invariant of velocity gradient, colored by shear, obtained from direct numerical simulations (DNS) of stratified Taylor-Green vortex at different times (increasing from left-to-right) and at Froude numbers of (a) 4 (b) 1 (c) 0.5 and (d) 0.16; The damping of turbulence by the buoyancy forces as a result of increase in stratification via decrease in Froude number is evident.