  In this work, we perform a systematic study of the symmergent gravity in a
black hole environment. The symmergent gravity, an emergent gravity model in
which gravity emerges in a way restoring the gauge symmetries and stabilizing
the Higgs boson mass, possesses a quadratic-curvature term with a loop-induced
coupling proportional to the boson-fermion number difference. We investigated
boson-fermion number difference and black hole parameters in symmergent gravity
by utilizing the values of various observables. In this regard, we investigated
particle dynamics and obtained Keplerian frequencies describing the harmonic
oscillations. We determined quasiperiodic oscillations about such orbits by
utilizing relativistic precession, warped disk, and epicyclic resonant models.
We studied weak deflection angle and planetary perihelion shift and determined
bounds on symmergent gravity parameters. We computed shadow radius for both
static and co-moving observers near and far from the symmergent black hole and
revealed the sensitivity of these observers to the model parameters. We
conclude the work by giving an overall discussion of the bounds, and giving
future prospects concerning other possible analyses of the symmergent gravity.
