CONTENTS 



Page 



Introduction 1 



Collection of data and methods of analysis 1 



Estimation of sampling variation 3 



Subsamples 3 



Samples (between trips) 4 



Comparison among factor levels 4 



Size categories 4 



Years 4 



Areas 4 



Months 5 



Conversion of dressed and round weight for haddock 5 



Lengths at sea versus lengths ashore 5 



Difference between round and dressed weight 5 



Conclusions 6 



Literature cited 8 



Appendix 9 



FIGURE 



No. Page 



1. Sampling areas 2 



TABLES 



No. Page 



1. Number of trips sampled for haddock length-weight study 3 



2. Natural logarithms of adjusted mean weights (pounds) 4 



3. Duncan multiple range test between months for large haddock 



from Georges Bank 5 



4. Sample regressions of ratio of round to dressed weight on length. . 6 



5. Regression statistics for haddock length-weight estimating 



equations (log e units) 7 



6. Loss of precision in using total regression equations 8 



in 



