I have a custom made charcoal spit and I've done a whole pig on a spit at least 10 times, so I have some experience doing this thing, however, this will be my first year cooking a sturgeon, or any fish for that matter, on a spit. I need help with and how long to cook it for.   The spit automatically rotates 3.5 rotations/minute. I plan on wrapping the whole fish in wire... will that be enough or will it be too tender/start falling apart? I'm also worried about overcooking it and making it too tough. Any other advice? 
You can test an egg for its freshness by placing an egg in a bowl of water as seen here.   If the egg sinks to the bottom and lays on its side, it should be fresh and safe to eat. If the egg sinks to the bottom and stands upright on one end, it should still be fine to eat. If the egg floats to the top, it's not fresh but not necessarily unsafe to eat. In this case you should break open the egg shell and smell if there is an unpleasant odor see here. If there is an unpleasant odor, you shouldn't eat the egg.  