3301

• UCREFRP Catalog Number: 3301
• Author: Papoulias, D.
• Title: Effect of Food Availability on Growth and Mortality of Larval Razorback Sucker,
• USFW Year: n.d.
• Copyright Material: NO

1 .T

4
according to the following (O'Connell and Raymond, 1970):
mn=dnt(P-S-D)dn/D
where mn=total dead on day n; do=dead observed on day n; D=dead
observed on all days;. 5=survivm_r6I >Ind
The Data for Experiments 2 and 3 were statistically
evaluated using the Mann-Whitney U test.
RESULTS
Experiment 1. Seventy-five percent of unfed larvae were dead by
day 26 post-hatching. By day 50 all larvae were dead. A
majority died between 20 and 30 days from hatching (Fig. 1;
Appendix A). Dead fish measured an average of 9.6±.8 mm TL (Fig.
2; Appendix A).
Experiment 2. No mortality was experienced by larvae receiving
food from day 5 post-hatching. Larvae that received food
beginning on days 9, 13 and 17 had respective mortalities of
10.0, 10.0 and 26.7 percent. There were no significant
differences (.1>p>.05) among days 5, 9, 13 and 17 (Table 1;
Fig.3; Appendix B). Highest mortalities occurred when larvae
were without food for 25 (86.7%) and 29 days (93.3%). There were
no differences between these levels at .1>p>.05. A majority died
between 20 and 30 days after hatching (Fig. 4; Appendix B) at
anaverage size of 9.31.7 mm TL (Fig. 5; Appendix B). Surviving