Interesting stuff Barry.

And by the way, welcome to Pond Boss and thanks for participating! How about starting a thread with some photos about your "Riverine Spawning system for River Minnows" and/or about your hatchery.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)