Bosch diswasher

I had this problem for years, tried everyone's suggestions with no luck. Finally, it occurred to me the the best smell killer is ammonia. I poured about a half cup into the bottom of the empty dishwasher, ran a short cycle and there is absolutely no smell. I think I will do this regularly as needed and sure will not wait until I'm gaggin from that smell. It sure seems common to this brand and the Bosch people will not acknowledge it at all!!

If it is new- then the fishy smell is almost certainly the motor and circuit boards
'cooking' in- most motorized electrical devices have an initial pong.

However if it persists after say 10/15 cycles
begin to suspect an incipient fault.

there is really nothing in a dishwasher construction to smell. however, check that the drain is so connected that there is a water trap between dishwasher and the drain