UV lamp to disinfect raw sushi fish slices
That is an interesting idea, but I would not recommend it.

It is true that UV light is able to kill microorganisms, and it has been used to treat water for quite some time now. It has also been used to treat some types of juices, and is even used in the food industry (factories). It is an alternative to pasteurization, since it provides an alternative way to killing harmful bacteria without altering the food taste.

However, the uses of UV light in solid foods (and even liquids) do require extensive study about the food properties. This means that, in order to effectively use UV light to kill bacteria in fish, one would have to seriously study how it interacts with the specific type of fish you plan on using.

I am not sure if such study for fishes exists. So, it is best to avoid using this technique, since it could potentially make people sick.

A good read about this topic is this academic paper, entitled "Review: Advantages and Limitations on Processing Foods by UV Light".