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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71
Detection of such changes demonstrates the sensitivity of body lipids to environmental
variation.

3. 230C

Mean length, weight and lipid levels of newly hatched larvae, a sub-sample of the

same group oflarvae utilized for the 140C temperature treatment, were 8.2:t .02 mm, 0.2

:t 0.02 mg, 0.04:t 0.003 mg, and 19.5:t 0.4 % respectively.

Length increases were clearly extremely rapid (Figure 16 a). Unfortunately all

larvae from d 6 until the end of the experiment (d 24) were lost due to freezer failure. By

d 24, however, Ad libitum larvae averaged 21.96 mm in TL. Starved larvae continued to

increase in length through d 17, reaching an average size of 12 mm TL, significantly

shorter than Ad libitum larvae (Table 16). Ad libitum larvae averaged 9.04 mg at the end

of the experiment, whereas Starved larvae averaged a significantly lower weight at 0.37

mg (Figure 16 b, Table 16). Lipid levels for the former remained high, and significantly

greater than levels for Starved larvae, averaging near 18% (Table 17, Figure 16 c). Lipid

levels for Starved larvae dropped quickly to about 10% and remained there.

4. Comparison of Temperature levels:

A. Growth
As expected, maximum growth rate of razorback sucker larvae was dependent

upon temperature. Length and weight changes were most marked at Ad libitum feeding