weight might cause allometry. Zvveifel and Lasker 

 11976) briefly considered the length-weight rela- 

 tion in terms of a modified Gompertz-type relation 

 and noted overestimation problems in extrapola- 

 tion at the largest sizes. 



Length-weight relations have merit, but their 

 usefulness is greatly enhanced when combined 

 with other studies, particularly those on age. 

 Length- weight by itself does not necessarily imply 

 rate of change because of the potential influence 

 the environment may have on changing growth 

 with time. However, when correlated with age and 

 compensated for change in rate due to biotic and 

 abiotic influences, length-weight studies can be an 

 important component in estimating growth, sur- 

 vival, and population production. 



Acknowledgments 



I wish to thank J. B. Colton, Jr. and K . Sherman 

 for their critique of the manuscript, and B. R. 

 Burns, T. A. Halavik, and A. S. Smigielski for 

 their assistance in rearing the larvae and collect- 

 mg measurements. 



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Geoffrey C. Laurence 



Northeast Fisheries Center Narragansett Laboratory 

 National Marine Fisheries Service. NOAA 

 R.R. 7 A. Box 522 A 

 Narragansett, RI 02882 



EFFECT OF THERMAL INCREASES OF 



SHORT DURATION ON 

 SURVIVAL OF EUPHAUSIA PACIFICA 



Euphausiids are an important source of food for 

 many valuable species of fish including herring, 

 cod, pollock, and salmon. Cooney (1971) reported 

 that Euphausia pacifica was the most abundant 

 species associated with the diffuse scattering layer 

 at all locations in Puget Sound, Wash. He found 

 that during the day euphausiids are most abun- 

 dant between depths of 50 and 100 m and that at 

 night most of the population migrates into the 

 upper 50 m. Cooney's findings indicate that great 

 numbers of euphausiids could be drawn through 



FISHERY BULLETIN: VOL. 76. NO. 4, 1979. 



895 



