So, the Japanese think of a solution. Yosh~! Wakaramasu~ If the crumbs are removed automatically, then the oil will stay fresher for long period of time and less often to change it. This is what they thought of:
For the benefit of those who are unable to view the video, Japanese reared goldfish under the deep fryer. How is this possible you asked? Well, water has a higher density than oil, thus oil will natually float above the water. The heater installed near the top will heat up the oil to at least 160 degrees celcius for frying.
If, that is if, the goldfish somewhat forget and swam upwards, they will be fried alive... As a goldfish owner, I condemn this act as it violates the goldfish living rights and it is a very cruel way of treating living things!
I will never eat at restaurants that uses this kind of fryer!