Sorry it's actually called "Cooperative Extension service," (extensions for short)
Here is the main link.
Cooperative Extension System Offices
The last time I bought fish emulsion as a fertilizer, it stated on the package that it was "fish poop", I wouldn't doubt if it had other compounds in it as well. But it was sold as a fertilizer. I don't think you'll ever find a product called "fish poop," you know how packaging is. I have never bought guano, even as a fertilizer. But I wouldn't think it would be usable for hydroponics (as is) straight from the bat cave. It's just a general term because it can come from many flying animals (usually bats). That's just one reason I would suggest talking to many of the the manufactures/retailers who make it for HYDROPONICS specifically.