354 BULLETIN OF THE BUREAU OF FISHERIES. 
TABLE 15.—RATE OF DIGESTION AT DIFFERENT SEASONS, AS JUDGED BY INTERVAL BETWEEN EATING 
AND FirsT APPEARANCE OF FECES. 
[Summary of data presented in Tables 11 to 14.] 
7 Fish used. Food eaten. 
stage [=] Avera 
LES (deerees Average : digestion 
Number.| weight Kind. Number. } (hours). 
grade). (grams), 
Oct. 2,1916 16.5 10 2.8 6.0 
Jan. 24) 191 2.5 2 2-8]. 43-7 
Do.. 18.0 a 2.8 22.0 
2 an cgagnnuce agape 2-5 2 275 46.5 
Jerry rors 3 tee ee 2.5 2 2.8 475 
Jans us. tonz7 ee ek 18.0 2 2.8 23.0 
OAR rotAtitesick. 2.5 2 27-5 48.0 
Jume 19, 1916... .......... 23-0 I 48.0 31-7 
DeceeS EGG a iesiee res 3-0 2 2.8 64-0 
Day Ts. seed Tt 3-0 2 27-5 64.0 
SEptssoXOrG sc cewesccvce 16.3 10 2.8 ea 
Sept.:20, 1916... ee 16.8 10 2.8 19.2 
JAUINS AOKI <2 a/c sw niese 2.5 2 2.8 \ 
Davs\.... 17-0 2 2.8 
July 20,1916. 26.0 I 48.0 
Jan. 8,1917.... 2.5 2 27-5 
Sept. 25.1916. . 16.8 10 2.8 
Sept. 22, 1916... 16.5 10 2.8 
Jam. 22,1917... 2-5 2 2.8 
Dees: Pap.» 25 2 27-5 
Sept. 27,1016... 17-0 10 2.8 
Jan. 1,1917.... 2.5 2 2.8 
Jan. 5,1917.... 20-5 2 2.8 
July 5,1916.. 23-0 I 48.0 
Jan. 1, 1917 2-5 2 27-5 
Dec. 26, 1916. 4:5 a 2.8 
June 30, 1916. 24-0 I 48.0 
Dec. 26, 1916. : 4:5 2 27-5 
GER AO IOKG cscs ccc cen: 17-0 ro 2.8 
TABLE 16.—PERCENTAGE OF VARIOUS Foops EATEN BY 715 ADULT PERCH CAUGHT AT VARIOUS 
DEPTHS AND AT ALL SEASONS IN LAKE MENDOTA DURING rgI5 AND 1916. 
é|gela]4 ji 
Depth at which caught b=] e ] 3 g F 5 3 a R 
(meters). cee pone a a a/s 5 | 3 r a 
tir t= Me Fis] pra es a Uefa = PRT Ve Yad WPT Ba 
a a % 9 9 g EY s 4s so} a | So 
3 = 1 = :) = @ > 2 & & g = 
Rael oa | aS | eee pa ae ee | BO) inte) eee | lesa Rico lO 
QO BORA. bis ane atm asain 5-3| 412] 33-0] 4.0] ro] rH] 7-0] 9-5] 0-4] 2%-2] O4] 3-2] O07] TO 
9-5 . 8.7 oS 4 1-7] 5-0 +I at +3 . 1.6] 25 
1.6 8.4 eI ° 8 +4 Oo -t 3-4 3-4 
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TABLE 17.—NUMBER OF TIMES A PARTICULAR Foop FoRMED THE LARGEST ITEM, BY VOLUME, IN ALL 
PeRCcH CAUGHT AT THE SAME TIME AND DEpTH.2 
[Percentages refer to numerical ratios, not to volume of food.] 
Cla- Oligo- 
Depth (meters). ish. 1 doc- | Snails. Bvieeres! 
era. 
@ 687 adult perch caught during rors and 1916 in Lake Mendota are included. 
