Make sure your space fish are thoroughly cooked - salmonella bacteria become more virulent in space.
This isn’t because they are happier floating about in zero-g - though I bet their tiny little sensory organs are as delighted as they can be. It’s because they are free of fluid shear, the mechanical force of fluid around a cell. This is pretty rough on a tiny little cell, so bacteria like to congregate in low-shear environments, like cracks and crevices and intestines.
Clearly, we require technological breakthroughs so that we may safely have space sushi.
