A fish with no swim bladder, nor any other air-filled spaces, living at a depth of 1000 meters... can be crushed by the intense pressure of the water, because it is experiencing 101 atmospheres of pressure
will not experience negative impacts of high pressures, because without air-filled spaces, its body tissues (which are mostly water) will be at the the surrounding water.
will not be able to survive, because it will not be able to take up oxygen through its gills. may experience rapid inflation at such deep depths.