Fish Hatchery Management - fisheries & aquaculture

HA'TCHERY OPERATIONS 69Tasle 8. FLOw INDEX RELATED To wA'TER TEMPERATURF, AND ELE,VATION- FORTROUT AND SALMON, BASED ON AN OPTIMUM INDEX OF F: I.5 A'f 5O'F AND 5,000FEE,T ELNVATION. OXYGE,N CONCEN'I'RAI'ION IS ASSUMED TO BE, AT OR NEAR IO0'".SATURATION, (SOURCE: BRUCE B. CANNADY, UNPUBLISHED.)WATERTEMPL,RATLIRE(.F)t.l.t.\ A I tuN rt ut_ i lI,000 2,000 3,000 ,r,000 5,000 6,000 7,000 rJ,000 {),000.104l42,{:l442.70 2.6t 2.52 2.4.12.ri I 2.52 2.41 2.:Ja2.52 2.41 2.3.5 2.272.43 2.3r 2.27 2.l:,'2.,14 '2.2('2.ltl 2.ll2.3+ 2.25 2.t6 2.09 2.01 I .9.12.26 2. l8 2.09 2.02 I .9'1 L872.1lt 2.t0 2.0'2 1.95 I .uu l .tJ I2.1| 2.03 1.94 l .tilJ I .til )..7 +2.03 1.95 l.u7 1.81 t.71 l.6lJ454647.{ti492.'25 2. I 8 2. l0 2.0J2.tti 2.09'2.021.942.07 2.00 I .93 l.U6f.9tl 1.9 I l.lJj |.7 o1.89 l.tt3 ]176 r.70l.9ir l.tltit.87 1.801.7!t | .731.72 I .65t.64 l.5ll1.80 t.7 4 I .(ill l (i I1.7.t 1.r,7 l.t;t 1..;-1.6{i l.r;0 I.Jl l.{o1 .51t 1 .5:J l . t7 t.4zl.i l Llri t..l t t. 50515253545556575u591.80 1.74 l.6ti 1.621 .73 |.67 |.62 l.5t)t.67 l.til 1.56 I .50l.6l l.si 1.50 1.151.55 r.50 r.45 L40LiO 1.4; 1.40 1..i51 ..r5 1 .40 l.ll5 L3I1.41 1.36 l.3l 1.27I .ltrl | .32 | .'27 |.2.)1.32 l.2U l.24 l.l9l.56 t.50 |.4+ r.:l{) L3,t 1.291.50 1.1+ I .llti 1 .3,1 t.29 t.,2+| .44 I .39 L33 r .2{) t.').+ I . l9I .39 1.34 r .2!t | .21 I .20 L 15I .iJ'l 1.29 t.24 1.20 I . 16 1 . I I1 .30 1.25 l 20 I . 16 |.l'2 1.07L26 t.2t l.l(i t.t'z 1.08 1.0.1r .22 | .t7 l.l3 1.09 1.05 I .01l .l8 l. 1.1 I .01) 1.05 I .02 0.9r.tt.l5 l.r0 1.0{i 1.02 0.99 0.95606l6263641.29 t.24 1.20 l.l(i| .25 | .'2t | .t7 l. 13l.'22 t.|l{ Ll,t 1.09l.l8 l.l4 l. l l 1.07l.l5 l. 12 l.0l:t | .0 Il.ll 1.07 l.0lll.Ou l.0'1 1.00l .05 l .01 0.971.03 0.99 0.951.00 0.9(i 0.920.91) 0.9(i 0.1)20.!)7 0.{)3 0.900.9'1 0.t) I 0.ti70.92 O.ltfl 0.tt50.1.t9 O.lJ(i 0.u3(t) fne Flow Index (f) is t.gO (tabte 8,4,000 feet elevation,55"F temperature).(Z) We can now estimate the permissible weight of trout that can be heldper gallon per minute, by the formula W: F x L x I, where F: 1.30,Z:4 inches, and 1: I gallon per minute. Approximately 5.2 pounds oftrout can be safely reared per gallon per minute water inflow (t.gO x 4 x 1).The effect of water temperature on the Flow Index can readily be seen inthe table. For instance, a hatchery at a 5,000-foot elevation having a water