FISHERY BULLETIN VOL 77. NO, 



tions and the generally southward flow along this 

 sector of the shelf (Bumpus 1973) suggest that a 

 high proportion of individuals occurring in the 

 Bight are advected into the region from the north- 

 east. Irrespective of the origin of these popula- 

 tions, it can be as,sumed that they were major 

 consumers of the spring phytoplankton bloom in 

 1975. 



Centropages typicus and Temora longicornis are 

 warm temperate species (Fleminger 1975), and 

 their abundance in the New York Bight appears to 

 be strongly influenced by temperature. Lawson 

 (1969) found that C. typicus eggs failed to hatch 

 when maintained at S'-S" C, the prevailing water 

 temperature in February through May (Figure 3), 

 and Bigelow and Sears (1939) reported a north- 

 ward seasonal shift in abundance of C. typicus 

 beginning in the Chesapeake Bay-Delaware Bay 

 region in the spring, progressing to the New York 

 area in July, and finally reaching coastal waters 

 off New England in autumn. The geographical 

 distribution of T. longicornis corresponds closely 

 to that of C. typicus (Fleminger 1975), and it is 

 likely that it exhibits similar seasonal trends in 

 abundance. In the New York Bight in 1975, C. 

 typicus andr. longicornis increased in abundance 

 from April to July as water temperature rose from 

 about 5° to 20° C (Figure 3). These species appear 

 to be especially well adapted for exploitation of 

 coastal environments where high food levels per- 

 sist into the warm season. Their peak abundances 

 in 1975 occurred in or near the apex of the Bight 

 where primary production in July can exceed 1-3 g 

 C/m2 per day (Malone 1976). 



ACKNOWLEDGMENTS 



We thank the numerous people at the Northeast 

 Fisheries Center Sandy Hook Laboratory, NMFS, 

 NOAA, who participated in the survey, especially 

 A. Kendall for his cooperation in adding smaller 

 mesh nets to the original sampling array and for 

 providing hydrographic data. We are grateful to E. 

 Schwarting, S. Hoerscher, P. Pepe, R. Hautsch and 

 especially D. Ninivaggi at the Brookhaven Na- 

 tional Laboratory (BNL) for assistance in analysis 

 of the zooplankton. Thanks also go to numerous 

 individuals from BNL and the Marine Sciences 

 Research Center, State University of New York, 

 Stony Brook, for assistance in collecting and pro- 

 cessing chlorophyll samples on survey cruises, to 

 J. Wartha, Environmental Products Group, Na- 

 tional Environmental Satellite Service, NOAA, for 



providing Gulf Stream analyses cited in the study, 

 and to A. Fleminger, Scripps Insitution of 

 Oceanography, for identifying specimens of 

 Calanus helgolandicus. A. Kendall, S. Smith 

 (BNL), and M. Dagg (BNL) offered helpful sugges- 

 tions towards improvement of the manuscript. 

 This research was supported by the U.S. Depart- 

 ment of Energy under contract no. EY-76-C-02- 

 0016. 



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