CONTENTS 



Introduction 1 



Methods 1 



Results 4 



Statistical summary 4 



Analyses of covariance 4 



Discussion 13 



Conclusions 13 



Literature cited 16 



Figures 



1 . The northwest Atlantic area, considering in length-weight regression analyses for squid, showing (A) 



survey strata and ICNAF Divisions and (B) geographical areas 2 



2. Dorsal and ventral views of the squid, Loligo pealei and Illex illecebrosus, and features used for length 

 measurements 3 



3. Seasonal (spring, summer, autumn) geographic distributions of Loligo pealei catches from U.S. bot- 

 tom trawl surveys in the northwest Atlantic, 1977 5-7 



4. Seasonal (spring, summer, autumn) geographic distributions of Illex illecebrosus catches from U.S. 

 bottom trawl surveys in the northwest Atlantic, 1977 8-10 



5. Plots of squid, Loligo pealei and Illex illecebrosus, overall length-weight relationships for the north- 

 west Atlantic, all data combined 17 



Tables 



1 . Survey cruises in the northwest Atlantic in which Illex illecebrosus and Loligo pealei were obtained 



for length-weight analysis 1 



2. Length-weight summary statistics for northwest Atlantic squid, Loligo pealei and Illex illecebrosus, 



by sex, area, season, and year 11 



3. Regression parameters and statistics for dorsal mantle length and total weight relationships of north- 

 west Atlantic squid, Loligo pealei and Illex illecebrosus, by sex, area, season, and year 12 



4. Analysis of covariance of adjusted means and slopes of Loligo pealei length-weight regressions 14 



5. Analysisof covariance of adjusted means and slopes of ///eAr///ecefcro5W5 length- weight regressions .... 15 



6. Percentage overall errors in calculated sample weights of squid species versus empirical sample 

 weights using length-weight function for all data and for annual, seasonal, and area data by sex 16 



lU 



