8142

• UCREFRP Catalog Number: 8142
• Author: Horn, M. J.
• Title: Nutritional Limitation of Recruitment in the Razorback Sucker ‎(
• USFW Year: 1996.
• Copyright Material: NO

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70
owing to an incubation temperature of 180C vs. 230C for the other two experiments. At

fIrst feeding, all larvae were the same size.

As with other experiments, Ad libitum treatment larvae were by d 10 larger,
heavier, and contained a higher proportion of lipids than their counterparts (Table 12,
Figure 15 a). By d 29 Ad libitum larvae had increased to a mean size of21.2:t 0.37 nun.
Suboptimal and Starved larvae did not begin to differ significantly in size until 22 d. The
former were 14.5:t 0.2 nun by end of the experiment. Starved larvae showed an initial
increase in growth associated with use of yolk reserves, after which all change in length
ceased. Starved larvae did not survive to conclusion of the experiment (29 d).
Weight of Ad libitum larvae increased in a log-linear fashion (Figure 15 b).
Again, differences between Ad libitum larvae and the other two were apparent from 10 d
on. Starved and Suboptimal larvae did not differ significantly in weight until d 22 (Table
13). By d 29, Ad-libitum larvae averaged 6.5 mg, Suboptimal larvae, 0.67 mg (a 50%
increase in weight), and Starved larvae an average 0.243 mg at d 22 when the last
individuals died.

Lipids expressed a percentage body weight were difficult to interpret. Suboptimal

and Starved larvae never differed significantly over the course of the experiment (Table

14, Figure 15 c). Ad libitum larvae always had a significantly higher proportion of body

lipids than their counterparts except for d 22, when no treatments differed significantly

from one another. The dip in lipid levels on d 22 for Ad libitum larvae, was not reflected

in any other parameters, and was traced through analysis of feeding logs to laxity on the

part of assistants feeding the larvae; on at least one occasion the wrong tanks were fed.