They are commonly used in aquaponics in California. Here is an interesting paper on them:

https://escholarship.org/content/qt8st5g6df/qt8st5g6df.pdf?t=q5auch

Here is another:

https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=104369&inline

Last edited by jpsdad; 05/16/21 10:30 PM.
It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers