It turns out that the effects of microgravity on medaka aren’t much different than our own—the effects just set in much faster. For humans, it takes at least ten days for the symptoms to start showing up, but according to a new study published in the journal Scientific Reports, the fish started losing bone density almost immediately upon arriving in orbit. Since humans and medaka grow their skeletons in similar ways, that gives scientists a good starting point to figure out how the process actually occurs, Byrne reports.
I think that a shark could technically be shipped into outer space, along with water for it to live in.
searches
It does sound like fish might not do so well in zero gravity, but they can apparently function in it.
https://www.smithsonianmag.com/smart-news/fish-dont-do-so-well-space-180961817/