8190

• UCREFRP Catalog Number: 8190
• Author: Papoulias, D. and W. L. Minckley
• Title: Effects of Food Availability on Survival and Growth of Larval Razorback Suckers in Ponds
• USFW Year: 1992
• USFW - Doc Type: Transactions of the American Fisheries Society
• Copyright Material: YES

346
PAPOULIAS AND MINCKLEY
TABLE 2.-Mean total lengths and weights ± SEs (ranges in parentheses) for razorback sucker larvae reared in
ponds at three fertilization levels, low, medium, and high. Means are the averages of approximately 20 fish from
four replicate ponds unless noted. When analysis of variance yielded a significant F-value (ANOVA: P < 0.05*),
Tukey's HSD procedure indicated differences between treatment means; means along a row without a letter in
common are significantly different (P < 0.05).

Week

Measure

High Treatment

Medium

Low
ANOVA
P
Oa Length (mm) 9.96 ± 0.04 9.96 ± 0.04 9.96 ± 0.04
(9.40-10.70) (9.40-10.70) (9.40-10.70)
Weight (mg) 3.70 ± 0.06 3.70 ± 0.06 3.70 ± 0.06
(2.80-4.39) (2.80-4.39) (2.80-4.39)
lb Length (mm) 10.20 ± 0.07 10.51 ± 0.12 10.45 ± 0.10 0.39
(10.20-10.53) (10.27-10.65) (10.32-10.65)
Weight (mg) 3.63 ± 0.12 3.77 ± 0.36 3.60 ± 0.34 0.94
(3.30-3.83) (3.28-4.46) (3.16-4.27)
2 Length (mm) 11.19 ± 0.18 11.12 ± 0.21 10.82 ± 0.16 0.31
(10.67-11.46) (10.52-11.45) (10.42-11.18)
Weight (mg) 5.23 ± 0.41 5.14 ± 0.27 4.62 ± 0.47 0.53
(4.04-5.78) (4.53-5.81) (3.41-5.68)
Y Length (mm) 13.37 ± 0.26 z 13.00 ± 0.14 z 11.80 ± 0.21 y 0.00*
(12.97-14.04) (12.75-13.30) (11.19-12.09)
Weight (mg) 9.80 ± 1.27 z 9.01 ± 0.36 zy 6.50 ± 0.41 y 0.01*
(9.78-12.02) (8.33-9.76) (5.38-7.29)
4 Length (mm) 14.84 ± 0.30 z 14.25 ± 0.32 z 13.21 ± 0.48 y 0.04*
(14.25-15.43) (13.32-14.73) (11.96-14.26)
Weight (mg) 15.24 ± 1.36 z 12.67 ± 1.30 zy 9.86 ± 2.27 y 0.03*
(12.74-16.58) (8.96-14.7) (7.21-13.17)
5 Length (mm) 15.85 ± 0.40 z 15.56 ± 0.30 z 14.06 ± 0.36 y 0.01*
(14.86-16.79) (15.23-16.45) (13.09-14.65)
Weight (mg) 23.03 ± 4.16 z 21.27 ± 3.22 zy 14.70 ± 0.04 y 0.02*
(19.06-29.18) (18.71-26.32) (12.60-17.05)
6 Length (mm) 18.9 ± 0.39 z 18.17 ± 0.39 z t6.22 ± 0.44 y 0.01*
(17.34-20.22) (17.11-18.92) (15.62-17.54)
Weight (mg) 45.09 ± 11.50 z 36.9 ± 7.41 zy 25.16 ± 6.24 y 0.03*
(29.94-57.47) (27.30-46.28) (21.35-34.83)
7 Length (mm) 22.85 ± 0.75 21.43 ± 0.60 19.72 ± 0.64 0.26
(20.90-24.50) (19.70-22.37) (18.60-21.20)
Weight (mg) 91.28 ± 5.74 z 70.36 ± 7.29 zy 50.87 ± 6.60 y 0.03*
(62.84-118.22) (49.67-82.34) (39.52-66.50)
8 Length (mm) 25.21 ± 0.68 z 24.20 ± 0.60 z 21.94 ± 0.28 y 0.01*
(24.35-27.26) (22.96-25.69) (21.35-22.63)
Weight (mg) 138.28 ± 16.0 z 126.72 ± 12.68 zy 80.62 ± 5.30 y 0.02*
(113.48-184.44) (90.59-149.76) (68.60-93.00)
2 N = 50 for each treatment.
b N = 3 for medium and low treatments
I N = 3 for medium treatment.
zorback suckers between 10 and 26 mm TL (r 2 =
0.70) is
ULL = -0.16 + 0.04(TL);
then,
gape = 21" •(ULL).
Maximum and mean widths of prey organisms
also increased linearly over the total length of fish
studied (rz = 0.55 and 0.45, respectively), but at
a lesser rate. Maximum size of ingested prey was
smaller than maximum possible sizes predicted
from ULL measurements. This trend has been re-
ported for other species (Arthur 1976; Gadomski
and Boehlert 1984) and indicates that some other
factor such as esophagus diameter or mouth
breadth (Wankowski 1979) limits food size selec-
tion. There were no statistical differences among
fertilization treatments for ULL (F = 1. 1, P =
0.34) or for maximum (F = 0.9, P = 0.38), min-
imum (F = 1.0, P = 0.36), or mean (F = 2.2, P
= 0.11) prey widths eaten.