Many non-Japanese conflate sashimi and sushi; the two dishes are actually distinct and separate. Sushi refers to any dish made with vinegared rice, and while raw fish is one traditional sushi ingredient, many sushi dishes contain seafood that has been cooked, while others have no seafood at all.
It's the moisture and contaminents that break down the DOT 3 and 4 fluids which is the reason to change the fluid in the first place. If you don't change it, what happens is moisture enters the system via the vented fill caps on the brake master cylinder. This moisture along with dust, mixes and travels in the system eventually making it's way to the lowest points in the system.
Drive the vehicle, making numerous stops and accelerations. If you hear a constant whining noise, accompanied by a slip in the gears as the transmission automatically shifts, it points to low transmission fluids. Without the proper fluid level, the pump has to push air through the transmission, which causes the noise and produces the hesitation or slippage. Any leaks on the ground will confirm a loss of transmission fluid. Sit in the vehicle with the engine idling and the shifter in park or neutral. Keep your foot off the brake pedal. Push the accelerator pedal, gently raising the engine rpm. If you notice a humming noise that increases in intensity as the engine rises in speed, it points to a malfunctioning transmission pump or pump shaft. Since the gear train has not been engaged in drive, it rules out all the other components.