  According to the celebrated Bolgiano--Obukhov
\citep{Bolgiano_1959,Obukhov_1959} phenomenology for moderately stably
stratified turbulence, the energy spectrum in the inertial range shows a dual
scaling; the kinetic energy follows (i) $\sim k^{-11/5}$ for $k < k_B$, and
(ii) $\sim k^{-5/3}$ for $k > k_B$, where $k_B$ is Bolgiano wavenumber. The
$k^{-5/3}$ scaling akin to passive scalar turbulence is a direct consequence of
the assumption that buoyancy is insignificant for $k>k_B$. We revisit this
assumption, and using constancy of kinetic and potential energy fluxes and
simple theoretical analysis, we find that $ k^{-5/3}$ spectrum is absent. This
is because the velocity field at small scales is too weak to establish a
constant kinetic energy flux as in passive scalar turbulence. A quantitative
condition for the existence of the second regime is also derived in the paper.
