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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68

m. Results

1. 140C
Changes in length, weight, and lipid amounts and as percentage body fat
responded to feeding treatments and over time. All larvae originated from the same pool
oflarvae, thus pre-feeding larvae did not differ in terms of growth history. Mean length,
weight, and lipid levels (weight and percentage body weight) of newly hatched larvae
were 8.17:t .024(SE) mm, 0.22:t 0.024 mg, 0.04:t 0.003 mg, and 19.5:t 0.39%
respectively. Values had significantly diverged for all measurements for all three
treatments by 33 d. (Figure 14 a - c). For a period of about 4 d near the beginning of the
experiment, temperatures rose as high as 230C due to a cooler malfunction, which
possibly affected growth rates.
Length analyses were conducted using TL 2 as a dependent variable after residual
plots indicated TL or Log TL produced substantial departures from normality. The
overall model showed a significant effect due to feeding TREATMENT and AGE. There
was no significant repeated-measure effect. There was, however, a significant
TREA TMENT*FEED interaction, indicating larvae in the three treatments responded
differently as they aged. Although larvae were first presented with food on d 3, they did
not begin to feed actively until about 6 d old. Within 4 d of the onset of feeding Ad
libitum larvae were significantly larger than their counterparts in the two other treatments
(Table 9), achieving a maximum mean length of 18 mm TL at the end of the experiment
(33 d). Mean lengths oflarvae on a Suboptimal ration and Starved larvae did not