The typical trough (Figure 1) used
for egg hatching and fry rearing
holds roughly 100 gallons of water
and is about 8 feet long, 2 feet
wide and 10 inches deep. Troughs
this size can hold 10 spawns at a
time without crowding. Although
the number of eggs per spawn
varies with the size of the female
brood fish, the ten spawns will
contain (as a rough average) a
total of 200,000 eggs. After the fry
begin feeding, hold only about
100,000 fry in a trough of these dimensions