TABLE OF CONTENTS Pages Symposium 1 - the National Sea ...

percentage size differences for each female were then averaged together to produce an
average difference. It was found that the females were 87.9 % of the length of the males,
but only 66.6 % of the male weight. For tanks that had at least three females, a t-test was
used to compare the weights of females to males. In each case, the males were
significantly larger at the = 0.05 level.
E. Coefficient of Variation
The coefficient of variation is the standard deviation divided by the mean, thus the mean
acts as a scaling factor so that standard deviations can be compared, from one sample to
another. If all the fish grow at the same specific growth rate, the coefficient of variation
would remain constant. If, on the other hand, some fish grow proportionally faster than
others, possibly due to sex or aggressiveness, the coefficient of variation will increase with
time or size.
Table 3 provides the average value of the coefficient of variation for each treatment for
the three measurement intervals. An ANOVA repeated measurement analysis was
conducted using SAS. At the α = 0.05 level, neither time, temperature nor feeding level
resulted in statistically significant differences in the coefficient of variation.
Table 3. Summary of the average values of the coefficient of determination at the
beginning, midpoint, and end of the experiment for each treatment
Treatments
Temp. °C Feeding Level
Discussion and Conclusions
14
Coefficient of Determination
0 weeks 10 weeks 20 weeks
26 Satiation 0.26 0.27 0.27
26 87 % 0.27 0.27 0.47
26 73 % 0.24 0.24 0.26
26 60 % 0.25 0.32 0.29
29 Satiation 0.27 0.29 0.33
29 87 % 0.22 0.22 0.23
29 73 % 0.29 0.25 0.26
29 60 % 0.27 0.28 0.34
32 Satiation 0.23 0.25 0.28
32 87 % 0.28 0.29 0.28
32 73 % 0.24 0.28 0.29
32 60 % 0.24 0.32 0.35
Average 0.25 0.27 0.30
Std. Dev. 0.047 0.045 0.089
It should be reiterated that the fish used in this experiment were sex-reversed, graded
twice, and had been selectively bred for several generations. Thus the growth performance