194 
BULLETIN OF THE BUREAU OF FISHERIES 
In comparing starch digestion in the carp and the pickerel, it should be noted 
that the carp, which is largely a vegeterian, possesses amylase in tremendous amounts 
in the hepatopancreas and to a less extent throughout the intestinal mucosa. The 
pickerel, on the contrary, which ordinarily does not eat plant foods except what it 
may take in "second hand" within the digestive tract of its prey, possesses only a 
negligible quantity of amylase, having little in the pancreas, esophagus, intestine, 
and practically none in the stomach. 
Table 9. — Amylase 
(so c. c. digests were used containing boiled starch to 1 per cent and toluol to 5 per cent of total volume. Controls contain boiled 
extract. In iodine test, — = blue, no color change; + = some color change (reddish or brownish); ++ = colorless] 
Description 
Pancreas: 
Carp No. 2. 
N0.1 --{^°Sent: 
I"-^"-^' NO. 2 - --{™°^J?knt; 
Pickerel No 3 /control. 
ricKerei rio.i \experiment.. 
/control 
"lexperiment . 
Pickerel No. 4 
Hepatopancreas: 

/control. 
"\experiment. 
/control 
lexperiment.. 
Sucker 
Pancreas: 
Neeturus t?^^lt 
\experiment - 
C. c. 
of ex- 
tract 
Milligrams glucose per o. c. 
digest 
1.17 
1.17 
1.17 
1.17 
1.19 
1. 19 
1.19 
1.19 
1. 11 
1. 11 
1.11 
1.11 
1.20 
1.20 
1.11 
1. 11 
1.09 
1.09 
Days 
1.17 
2.08 
1.19 
1.92 
1.11 
10.00 
1.11 
11.10 
1.20 
6.25 
1.11 
6. 25 
1.09 
5. 88 
1. 17 
2.38 
1. 17 
2. 56 
1.19 
2.08 
1.19 
4.17 
1. 11 
10.00 
1. 11 
11.10 
1.20 
6. 25 
1.09 
6. 25 
1. 17 
2. 94 
1.19 
2.78 
Net gain 
Days 
0. 00 
.91 
.00 
.73 
.00 
8.89 
.00 
.00 
5. 05 
.00 
5. 14 
.00 
4. 79 
0. 00 
1.21 
.00 
1.39 
.00 
.89 
.00 
2.98 
.00 
8.89 
.00 
9.99 
.00 
5.05 
.00 
5. 16 
0. 00 
1.77 
.00 
1.59 
Iodine test 
at end of 
experiment 
+ 
+ 
+ 
+ 
++(1 day). 
++(1 day). 
++(lday). 
-H-(lday). 
++ 
Table 10. — Amylase in hepatopancreas of carp 
[Digest=0.5 c. c. extract in 50 c. c. total (1 per cent starch, 5 per cent toluol). Control contained 0.5 c. c. boiled extract] 
Description 
Milligrams glucose 
per c. c. digest 
Hours 
Net gain 
in 4 hours 
Iodine test 
In 4 hours 
0 
4 
[control 
Carp No. 1 .-. --. ^experiment 1.. 
[experiment 2.. 
[control 
1. 25 
1.25 
1. 25 
1.10 
1. 10 
1. 10 
1.25 
7. 42 
7.42 
1. 10 
6. 67 
6. 67 
0.00 
6.17 
6. 17 
.00 
6. 57 
6. 57 
Blue. 
Colorless. 
Do. 
Blue. 
Colorless. 
Do. 
lexperiment 2.. 
