Over a 10-to 12-week spawning
season, each set of three 100-gallon
troughs (one for eggs, two for fry)
could be expected to produce
roughly 1 to 1.5 million fry and
would require a minimum flow of
7.5 gallons per minute (three
troughs times 2.5 gallons/minute
per trough). A hatchery capable of
producing about 10 million fry per
spawning season will typically
contain 21 to 30 troughs and require
a minimum water flow to
the hatchery of 50 to 75 gallons per
minute.