Walleyes For Tomorrow runs portable fish hatcheries where they take over for mother nature. They strip the fish, incubate the eggs, and release the fry.
The system uses continually circulating water from the lake. The fry are kept inside the jars with a filter setup, but once released they flow out through a trough to a vat that also has a filter. They are carefully collected into coolers then taken out to the middle of the lake to be released.
In your case you could probably hold them in another tank if you could circulate "blooming" water.
