9-34 



Treatment effects were highly significant for all data (Appendix Table 

 9-1) indicating that increase in length (growth) was significant at both 

 stations in 1975, 1976 and 1977. 



Tukey procedures for pairwise multiple comparisons were then 

 employed to determine those months between which mean length differed 

 significantly. Of particular interest are significant differences 

 between adjacent months as these indicate periods of active growth. 

 Except for Harbor Station, 1977, variances by months were homogeneous 

 within each station/year data set, therefore modified comparison pro- 

 cedures had to be used for the Harbor Station, 1977 data in order to 

 maintain an experimentwise alpha level of 0.05 (Gill, 1977). Appendix 

 Tables 9-2 and 9-3 show the results of this analysis which are sum- 

 marized in Table 9-8 and Figure 9-7. 



