Table 3.

V_max and K_m values for Nile tilapia and rainbow trout

Nile Tilapia			Rainbow Trout
Tilapia (Vmax)/Trout (Vmax), %	Tissue	Vmax, µA/cm2	Km, mM	Tissue	Vmax, µA/cm2	Km, mM
Proximal	47.0 ± 6.7	4.2 ± 0.7	Pyloric ceca	2.3 ± 0.4a,b	4.2 ± 1.0a	2,043d
Midintestine	59.6 ± 7.0	6.0 ± 1.0	Midgut	1.7 ± 0.3a	1.8 ± 0.3b	3,506d
Hindgut	56.2 ± 9.3	5.7 ± 1.1	Hindgut	2.4 ± 0.2b	12.3 ± 1.6c	2,342d

Values are means ± SE. Maximal velocity (V_max; µA/cm²) and Michaelis-Menten constant (K_m; mM) are represented for each tissue type in Nile tilapia and rainbow trout. Area of intestinal segment was 0.3 cm². There were no significant differences in V_max and K_m values between tissues for tilapia. In trout, significant differences between V_max values are as follows:

^apyloric ceca vs.

^bhindgut, and a midgut vs. ^bhindgut, with no significant differences between pyloric ceca and midgut (Tukey’s test after one-way ANOVA, P < 0.05). Significant differences between K_m values in trout are as follow: ^apyloric ceca vs. ^bmidgut, ^apyloric ceca vs.

^chindgut, and ^bmidgut vs. ^chindgut (Tukey’s test after one-way ANOVA, P < 0.05).

^dSignificant V_max values between tilapia and trout (Student’s t-test, P < 0.05).