July, 1955 
terus spp.) and 20 bluegills were caught. 
Crappies amounted to 84.6 per cent of the 
228 sport fishes taken in the 116 sets. 
Experimental Sets at Grafton.— 
During the regular test-netting program, 
no specific test was made of the efficiency 
STARRETT & BARNICKOL: COMMERCIAL FISHING DeEvIcES 
359 
rious mesh sizes of the inner net in the 
taking of sport fishes, as well as commer- 
cial and other species. 
The experimental trammel net was 
composed of three 50-yard lengths sewed 
together to form one net 150 yards in 
Table 28—Summary of the catches of fish taken in 27 sets made with a 150-yard experi- 
mental trammel net in three bottomland lakes (Flat, Silver, and Royal) near Grafton, Illinois, 
October, 1944. Figures in parentheses indicate the numbers of fish gilled. 
1144-Incu-Mesu Net 2-Incu-MeEsuH Net 3-Incu-Mesu Net 
Kinp oF FisH 
Number Per Cent Number Per Cent Number Per Cent 
Caught Gilled Caught Gilled Caught Gilled 
CoMMERCIAL 
Channel catfish . 0 (0) 0.0 2 (0) 0.0 0 (0) 0.0 
Black bullhead. . (GD) 8.3 0 (0) 0.0 0 (0) 0.0 
Brown bullhead. 0 (0) 0.0 1 (0) 0.0 0 (0) 0.0 
_ SD eee 1 (0) 0.0 6 (2) 33.3 1 (0) 0.0 
Smallmouth 
puttalos =... <2 5) Uy 20.0 3 (0) 0.0 1 (0) 0.0 
Bigmouth 
Budaloed . ..:,..: 0 (0) 0.0 13 (5) 38.5 5 (a0) 20.0 
Black buffalo. .. 2 (0) 0.0 3 (1) 33.3 1 (0) 0.0 
Carpsuckers..... 3 (0) 0.0 4 (0) 0.0 0 (0) 0.0 
Subtotal...... 23(2 _ 32 (8) oa 8 (1) — 
Average..... = 8.7 — 25.0 — 1225 
Sport 
Largemouth bass 1 (0) 0.0 0 (0) 0.0 0 (0) 0.0 
Spotted bass.... 5a (2) 40.0 teal) 100.0 0 (0) 0.0 
White crappie... 8 (0) 0.0 6 (0) 0.0 1 (0) 0.0 
Black crappie... 53 (8) Sa 13 (4) 30.8 1 (0) 0.0 
Bluepill... =... 4 (1) 25.0 0 (0) 0.0 0 (0) 0.0 
Warmouth...... Gl) 100.0 0 (0) 0.0 0 (0) 0.0 
Yellow bass..... 2 (0) 0.0 0 (0) 0.0 0 (0) 0.0 
Subtotal...... 74 (12) — 20 (5) — 2 (0) — 
Average..... — 16.2 — 25.0 — 0.0 
PREDATORY 
Shortnose gar... 46 (7) iis 2 (0) 0.0 0 (0) 0.0 
Longnose gar... 2 (1) 50.0 0 (0) 0.0 0 (0) 0.0 
Bows... 0... 11 (0) 0.0 6 (0) 0.0 0 (0) 0.0 
Saaolal....:. 59 (8) — & (0) — 0 (0) — 
Average..... -- 13.6 = 0.0 a 0.0 
FORAGE 
Gizzard shad.... 8 (3) BS 11 (1) 9.1 0 (0) 0.0 
Goldeye........ 1 (0) 0.0 0 (0) 0.0 1 (0) 0.0 
Subtotal...... 9 (3) a= 11 (1 = 1 (0) 
Average..... od 33.3 = 9.1 — 0.0 
MOtel ss. 3. - 165 (25) — 71 (14) -— ii (WD — 
Average..... “= 15.2 —— 19.7 — 9.1 
and selectivity of various mesh sizes of the 
inner net. However, such a test was con- 
ducted in late October, 1944, in a series 
of 27 sets made with a 150-yard experi- 
mental trammel net in several bottomland 
lakes near Grafton, Illinois. As these 
lakes were known to have high popula- 
tions of sport fishes, particularly crappies, 
they appeared to be especially suited for 
testing the efficiency and selectivity of va- 
length. The mesh size of the inner net 
of the first section, or length, was 11% 
inches, of the second 2 inches, and of the 
third 3 inches. This experimental net per- 
mitted the sampling of a site with three 
mesh sizes in one set. Each 50-yard sec- 
tion of netting is assumed to have had an 
equal chance to catch fish and, on the 
basis of this assumption, the following 
analysis has been made. 
