Screw machines, in particular for dosing, transporting, degassing and compressing bulk materials; screw conveyors; suction devices for screw machines, in particular for degassing and compressing of bulk materials; machine parts especially adapted for the aforementioned goods, in particular screw shafts, machine housings, machine gears, shaft couplings, electric motors, electric pumps, vacuum pumps, air filters and filters for separating bulk materials from air

Aquaculture feed