Table 6. 



-Percentage overall error' in calculated sample weights of squid species versus empirical sample weights using length-weight functions for all data and 



for annual, seasonal, and area data b\ sex. 



Area 



Season 



Year 



All 



All 



Spring 



Summer 



Autumn 



All 



1975 



1976 



1977 



All 



Mid-Allantic 

 Southern New England 

 Georges Bank 

 Gulf of Maine 



Nova Scoiia 



'Percentage error = (Total empirical weight-total calculated weight)/iotal empirical weight. 

 ^Sample size too small lo fit regression. 



frequency and total catch in weight data, a single equation ob- 

 tained from all samples is probably as accurate as applying dif- 

 ferent equations to catches from each sex, year, area, or season. 

 These equations for L. pealei and /. illecebrosus are plotted in 

 Figure 5. However, significant changes in this relationship, for 

 these short-lived species, could occur as a result of changes in 

 environmental factors. 



LITERATURE CITED 



W. J. DIXON (editor), and M. B. BROWN. 



1977. BMDP-77, Biomedical Computer Programs. Pseries. Univ. 

 Calif. Press, 880 p. Berkeley, Calif. 

 GROSSLEIN, M. D. 



1969. Groundfish survey program of BCF Woods Hole. Commer. Fish. 

 Rev. 3l(8-9):22.35. 

 MESNIL, B. 



1977. Growth and life cycle of squid, Loligo pealei and Illex illecebrosus. 



from the northwest Atlantic. Int. Comm. Northwest Atl. Fish., Sel. 

 Pap. 2:55-69. 

 NIE, N. H., C. H. HULL, J. C. JENKINS, K. STEINBRENNER. and 

 D. H. BENT. 



1975. SPSS (Statistical Package lor the Social Sciences). 2d ed. 

 McGraw-Hill Book Co., N.V., 675 p. 

 SQUIRES, H. J. 



1957. Squid, Illex illecebrosus (LeSueur). in the Newfoundland fishing 



area. J. Fish. Res. Board Can. 14:693-728. 

 1967. Growth and hypothetical age of the Newfoundland bail squid, Illex 

 illecebrosus illecebrosus. J. Fish. Res. Board Can. 24:1209-1217. 

 SUMMERS. W. C. 



1969. Winter population of Loligo pealei in the Mid-Atlantic Bight. 



Biol. Bull. (Woods Hole) 137:202-216. 

 1971. Age and growth of Loligo pealei, a population study of the common 

 Atlantic coast squid. Biol. Bull. (Woods Hole) 141:189-201, 

 VINOGRADOV, V. I., and A. S. NOSKOV. 



1979. Feeding of short-finned squid, Illex illecebrosus. and long-finned 

 squid, Loligo pealei, off Nova Scotia and New' England, 1974-75. Ini. 

 Comm. Northwest Atl. Fish., Sel. Pap. 5:31-36. 

 WINER. B. J. 



1971. Statistical principles in experimental design. 2d ed. McGraw-Hill 

 Book Co., N.Y., 907 p. 



16 



