Tuna are widely regarded as a delicacy in most areas where they are shipped, being prepared in a variety of ways for the sake of achieving specific flavors or textures.
When served as a steak, the meat of most species is known for its thickness and somewhat tough texture.
Some species (such as the bluefin) are also known for the sheer amount of blood they expel while being gutted. (source)
So can hamsters eat Tuna?
Unfortunately they can’t at all. They can’t eat fish and there is a danger that it will contain bones which will cause chokage if ingested.