That is very interesting behavior. Sharks lack a diaphragm since thy don't have lungs which makes a hiccup impossible, though it looks identical. It is a muscle spasm, probably from intermittent firing, which is not a good sign and often means pending doom.
I think you will know by tomorrow if you shark is going to make it. I had one floating and rolling in the current wih no ability to swim before only to find him calm on the bottom 12 hrs later, after a baytril injection. Still have the guy.
Good luck and let me know.
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