68 



Fishery Bulletin 97(1), 1999 



-0.2 

 -0.4 



R^ = 0.6506 



50 100 150 200 



Distance from Three Fathom Harbour (km) 



00 o 



50 100 150 



Distance from Bickerton (km) 



R- = 0.117 



50 100 150 



Distance from port (km) 



200 



Figure 5 



Pearson correlation coefficients of first differenced daily CPTH of 

 all index fishermen along the eastern shore versus increasing dis- 

 tance from Three Fathom Harbour (top) and Bickerton (middle). 

 The bottom figure plots the same statistic for all ports versus dis- 

 tance from each other. A fourth order polynomial provided the best 

 least-squares fit to each data set. 



ter temperature, and the effect of the latter on lobster 

 productivity. This study suggests that at least some of 

 these differences may be due to differences in effort 

 and "fishability" of the coastlines involved. 



These results also give a general indication of the 

 sampling effort (i.e. number of index fishermen) and 

 distribution (spacing of index fishermen) required of 

 a program whose objective is to characterize and as- 



sess changes in effort for an entire coastline. Because 

 changes in effort from index fishermen separated by 

 short distances, i.e. within the working reaches of a 

 fishing port, are strongly correlated, it would be more 

 effective for any given total sampling intensity to 

 space samples evenly along that coastline, rather 

 than cluster them in ports. Since the correlation of 

 index fishermen's catch data decreases quickly at dis- 



