PENNINGTON: TECHNIQUES FOR ESTIMATING ABUNDANCE 

 80-1 



YEAR 



Figure 5.— Survey index of abundance (solid line) and Collie and Sissenwine's index (broken line) for 



southern New England yellowtail flounder. 



of trawl surveys. Biometrics 41:197-202. 

 Pennington, M., and P. Berrien. 



1984. Measuring the precision of estimates of total egg pro- 

 duction based on plankton surveys. J. Plankton. Res. 6: 



869-879. 

 Pennington, M., and B. E. Brown. 



1981 . Abundance estimators based on statified random trawl 

 surveys. Can. Spec. Publ. Aquat. Sci. 58:149-153. 



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