  In this study, we focus on a black hole immersed in a cosmological
Chaplygin-like dark fluid (CDF), characterized by the equation of state
$p=-B/\rho$ and an additional parameter $q$ influencing the energy density of
the fluid. We investigate the geodesic structure, shadow, and optical
appearance of such a black hole. Through analysis on the effective potential
and the epicyclic frequencies, it is found that the existence of
innermost/outermost stable circular orbits for a timelike particle is governed
by the CDF parameters. The behaviors of the orbital conserved quantities and
Keplerian frequency are also examined. Due to the existence of
pseudo-cosmological horizon, the determination of the shadow radius depends
significantly on the position of the observer. By placing the static observer
at an approximately flat position between the event and pseudo-cosmological
horizons, we constrain the CDF parameters using EHT observations. We
investigate the effect of CDF on the shadows and optical images of the black
hole, surrounded by various profiles of accretions. For the thin disk
accretion, the light trajectories are categorized into direct emission, lensing
ring, and photon ring based on impact parameters. Due to the existence of
outermost stable circular orbits, outer edges could exist in the direct and
lensing ring images. The observed brightness is mainly due to direct emission,
with a minor contribution from the lensing ring, while the contribution from
the photon ring is negligible due to extreme demagnetization. In the case of
spherical accretion, we consider both static and infalling accretion models.
The images obtained under infalling accretion are slightly darker than those
under static accretion, attributed to the Doppler effect. Throughout the study,
we analyze the influence of the parameters $B$ and $q$ on the results.
