80 
= 70 
or 
uJ 
= 
uJ 
= 
Ei 60 
= 
< 
2 
” 
iz 50 
we 
fo) 
» 
e 
Oo 
Zz 4 
uj 
= 
3 
2 3 
SUMMERS OF LIFE 
Fig. 9.— Growth of P. shumardi throughout its life. Fish 
e from the August 13, 1964 rotenone collection at New Athens. 
le sexes are shown separately and actual numbers used in the 
erages for each year-class are shown. 
—-NWA 
SUMMERS OF LIFE 
—-nuovt Oo 
| Fig. 10. — Population struc 
3025 20 15 10 5 O 5 
SULLIVAN 
10 15 20 25 30 
15 
TaBLe 11.— Weighted mean calculated total lengths and 
growth increments for Percina collected from June 1965 to June 
1966°. 
Average Calculated 
Total Length in Millimeters 
at Indicated Year of Life 
Number © —____ 
Age at Last Annulus _ of Fish I II III IV 
a ee EE 
P. maculata 
4 4 44.4 58.6 68.3 78.7 
3 3 46.7 61.0 70.9 
2 19 AOS 
1 44 52.4 
Weighted mean 50.9 63.3 Oe 78h, 7/ 
Increments 
of Growth 90.9 12.4 Gl @.8 
P. phoxocephala 
3 
7 43.6 59.0 67.6 
2 20 43.6 Ole 
l 39 46.4 
Weighted mean 4523 60.6 67.6 
Increments 
of Growth 45.3 8 10 
a ee ea, 
P. caprodes 
3 2 Zoe OO. O08 LOTe > 
2 8 728) = W067 
l 11 70.4 
Weighted mean 7155) 105.9 9 19185 
Increments 
of Growth NS 33.9 16.1 
i ee eee 
P. shumardi 
2 3 46.3 64.9 
1 8 49.4 
Weighted mean 48.6 64.9 
Increments 
of Growth 48.6 16.3 
a Six of the P. shumardi were collected in August, 1964. 
P phoxocephala 
is maculata 
5 105 O 5 10 15 
VANDALIA 
5 0 5 
CARLYLE 
1965 POPULATION STRUCTURE AT THREE STATIONS 
ture of P. phoxocephala and P. 
+ 1965). Horizontal scale represents the actual number of fi 
maculata at three stations 
sh in each year-class. 
(from collections with rotenone, Au- 
