Fish Hatchery Management - fisheries & aquaculture

HATCHERY OPERATIONS7'.]in Figure 28. There is no effect on the rate of length increase or foodconversion of rainbow trout as frsh density increases from less than I to 5.6pounds per cubic foot.A rule of thumb that can be used to avoid undue crowding is to holdtrout at densities in pounds per cubic foot no greater than 0.5 their lengthin inches (i.e.,2-inch fish at one pound per cubic foot,4-inch fish at twopounds per cubic foot, etc.). A density index can be established that is theproportion of the fish length used in determining the pounds of fish to beheld per cubic foot of rearing space. Fish held at densities equal to one-halfatIE.UAL"amJ72.5OU)tUz.LOU;Ur.zzr.l-az.U)Ia,'/.^- .'-l \./,:/'/ ,t.ta'8/v'CONVERSIONt--t\---z^-----BIWEEKLY GROWTH PERIODSFIcunE 28. Relationship of cumulative length increase, foodconversion, and pounds per cubic foot (ftr) of rainbow troutreared in aluminum troughs for l0 months. (Source: pipert972.)