350 
carp avoid small-mesh nets and traps, but 
that they are taken readi'y in large-mesh 
nets. He writes, “Channel cat and bull- 
heads seem to go most readily into small- 
mesh nets and basket traps, probably be- 
cause, being largely nocturnal and hiding 
during the day, they go into the nets for 
concealment.” 
In 1946 test fishing, all of the 172 carp 
taken in the 214-inch-mesh wing nets 
I_uinois NAtuRAL History SurRvEY BULLETIN 
Vol. 26, Art. 4 
were of commercial sizes, table 16. At 
the stations at which the 2'%-inch-mesh 
wing nets were fished, only 78.5 per cent 
of the 303 carp taken in 1-inch-mesh 
wing nets were of commercial sizes. The 
catch of commercial-sized carp in the 24%4- 
inch-mesh wing nets amounted to 1.76 
pounds per net-day and in the l-inch-mesh 
nets to 1.10 pounds per net-day, table 15. 
The data indicate that the 1-inch-mesh 
Table 19—Composition of catches of commercial-sized or desirable-sized fish taken in 
2',-inch-mesh hoop nets and in l-inch-mesh wing nets, both types without leads, in fisheries 
survey of the Mississippi River between Burlington and Dubuque, Iowa, 1946. 
214-Incu-Mesu Hoop Ners 
(730.42 Ner-Days) 
1-Incu-Mesu Winco Nets 
(855.86 Net-Days) 
Cui- 
Kinp oF FisH SQUARE 
Pounds Number | Pounds Number | VALUE 
per Number per per Number per 
Net-Day Net-Day | Net-Day Net-Day 
ee ee ae erie 1.10 150 0.21 1.10 238 0.28 8.42* 
Bigmouth buffalo. ..}| 0.19 45 0.06 0.04 13 0.02 23.80% 
Smallmouth buffalo.| 0.19 59 0.08 0.04 16 0.02 32.22% 
Freshwater drum.... 0.34 152 0.21 0.23 210 0.25 2,35 
Channel catfish. .... 0.01 2 0.003 0.10 53 0.06 39.74* 
Flathead catfish.....| 0.84 58 0.08 0.27 42 0.05 5.80* 
iA EE (Toa | RARE ree ae Si — 0 — — 97 0.11 a 
White crappie. ..... -- 3 0.004 “= 1,228 1.43. |T 03 725ae 
Black crappie....... — 1 0.001 — 560 0.65 474.19* 
* Denotes a significant difference, in numbers of commercial-sized or desirable-sized fish taken, between the two 
types of nets at 0.05 level with 1 degree of freedom. 
Table 20.—Size ranges and means of the total lengths of fish taken in 2!4-inch-mesh hoop 
nets and in l-inch-mesh wing nets, both types without leads, in fisheries survey of the Missis- 
sippi River between Burlington and Dubuque, Iowa, 1946. 
21-Incu-MeEsu Hoop Nets 1-IncH-Mesu Wine NEtTs 
eg ig [ad eg le | ue 
i} Z 42 2) n ° a4 ee) 
OA ° A ° cal fas 
Kinp or Fisu Tale = 8 OR cig o =|? 
pee Olga cal her oe a Polelvunley s Tsolaz a 
oa.Ni oY] Oe ~ Ssloa.8|] oe] O82 w Ree m 2 5 
O-EH-E S| ot 6 |v fs |O-SH/ 25) os “~S josie} 3 
pele) ae ec oS 2 ol a |) ot Fier B55 sGies < 
Oo ¥5)F5) 2a Ng S2Y\o 95) Sa| Ba Ne |S2)|8a| = 
BEaIZzCT SQ] HE |HOMWESRAZC 24/ BE MAW) « 
Capra eater 99.3] 151) 21.28114.6-31.6) 3.31] 78.5) 303) 17.55) 4.7-30.0/4.85] 213] 9.623* 
Bigmouth buf- 
RAN rs Cire rs a 84.9) 53) 16.84/13.2-22.9| 2.07} 39.4) 33) 13.48) 4.5-19.6)3.67| 41] 4.804* 
Smallmouth 
buffalo;s;.... 66.3} 89) 15.35|10.0-20.0) 1.97} 5.8) 277) 9.21) 4.1-18.4/3.46) 156|20.842* 
Freshwater drum) 100.0} 152) 14.66/11.5-18.9] 1.39] 33.2) 632) 8.79) 4.0-18.6/2.93} 309/36.190* 
Channel catfish..| 66.6) 3) 17.67) 6.6-21.9| 9.03) 5.7) 936) 9.44] 2.7-30.1/2.21) 52} 1.578 
Flathead catfish.) 95.1) 61) 26.19/11.8-39.5] 6.33) 23.5) 179) 15.39) 5.6-37.6|5.30| 104|11.972* 
Bluegill.........) — Oo} — — — | 34.4) 282) 5.99) 3.0- 8.41.33) — — 
White crappie...| 100.0} 3) 10. 83|10.6-11.3| 0.29) 48.8/2,514) 7.36) 2.9-13.2/2.30| 86|20.448* 
Black crappie...| 50.0) 2! 8.25) 7.7- 8.8] 1.06} 41.7)1,343) 7.03) 3.0-14.0)2.14) 51] 1.625 
* Denotes a significant difference, in sizes of fish taken, between the two types of 
freedom indicated. 
nets at 0.05 level for degrees of 
