Hi! How long has the pond been up and running? How big is your pond and is it lined or natural? Do you have any filtration or water movement via a pump/fountain? Free-floating algae (pea soup water), or algae covering surfaces?
Can you share pictures?
I don’t know any more about sturgeon other than what I can Google, so can’t help you there.
Some algae is normal and is a normal part of the pond’s ecosystem. And, at certain times of the year, you’ll get seasonal algae blooms. Again, normal. Too much algae is caused by excess nutrients in the water — more than your biological filtration can handle. If you have a small pond, or your pond is overstocked for its size, without good filtration, the algae is actually a symptom of poor water quality. The solution is to correct the problem.
1. Test your water and be sure it’s balanced (nitrites, nitrates, ammonia, pH, KH).
2. Be sure you’re not overstocked (pond volume is big enough for the amount of fish)
3. Don’t overfeed
4. Have good biological filtration
5. Add plants (they help “eat” the excess byproducts)
6. Unless your pond is large enough to accommodate more fish, adding “algae eating” fish
isn’t a good idea (these extra fish will add to the problem)
7. Stay away from chemicals or quick-fixes. It takes Mother Nature to balance a pond.