There is a thing called peeponics.. and then there are watersports.. be careful what you Google for!
Aquaponic dudes sometimes ''seed" thier systems with pee to get some food activation of the 2 main bacteria needed to convert fish poo from ammonia to Nitrite and then Nitrate
It can take weeks to prepare a system before fish can be added.
For the record.
I don't piss on my fish..
(Sry if it's a bit offending the clip, just making a joke!)
f6
Edit: Fun fact!
Apparently a person can produce enough wheat grown by their own urine for a year..