Table 4. --Some characteristics of the ranges of the six length groups 

 a. Extreme ranges of each group 



b. Range in which each group is dominant 



c. Range of mil.28(r of each group (in this range 80 percent 

 of the individuals of each group are contained) 



Results - II. Quantitative Relationships 

 Among the Length Groups 



With regard to the quantitative occurrence 

 of each length group, the two central groups 

 of the six, that is group III and group IV, are 

 nnost outstanding. These two groups form a 

 peak with the occurrences declining as one 

 goes toward both ends of the distribution. The 

 permillage of each group is shown in table 5. 

 For every year, group III and group IV make 

 up nnore than half. On the average, for the 

 5-year period group in and group IV together 

 predominate overwhelmingly, forming 70 

 percent of the whole. 



When we look at the proportion occupied 

 by each size group from year to year, we see 



Table 5. --Relative abundance of the six 



length groups (by permillage) 



various different trends. For example, the 

 relative proportion of groups I and II increases 



10 



