66 



Fishery Bulletin 100(1) 



1 g '*^ ^ '2^ ^ 



-73.2) 



35 



30 - 



2.5 



20 - 



15 



10 



0,5 



0.0 



■X 



- Prionolus spp. 



— P evolans 



— P carolinus 



  I  • I —   I  — '—] — — — r-" — • 



1 Jul 1 Oct 1 Jan 1 Apr 1 Jul 1 Oct 



Figure 2 



Density (geometric mean number of larvae per 100 m^ 

 |±1 standard error, SE]) of Pnonotiis spp.. P. carolinus, 

 and P. evolans larvae for each cruise near Beach Haven 

 Ridge, based on daylight tows of a Tucker trawl at the land- 

 ward and seaward stations (see Fig. 1). Note break in scale 

 (range of SE bars are given in parentheses). 



Pnonotus carolinus 



50 



40 



30 



20 



50] 



40 



30 



20 



10 





 50 

 40 

 30 

 20 

 10 





 50 

 40 

 30 

 20 

 10 







July 

 n=64 



Pnonotus evolans Pnonotus spp. 



July 

 ffeSI 



\L^ 



10 

 

 100 



August 80 

 n=46 60 



EtU 20 







September 50 



f7=553 40 



30 



20 



10 







11^ 



2 4 6 8 1012 



September 

 rtll 



8 10 12 



Standard length (mm) 



Figure 3 



Size frequency of Prionolus carolinus, P. evolans, and Pri- 

 onotus spp. from Tucker trawl collections near Beach Haven 

 Ridge during July-September 1991. n = total number of 

 larvae collected. 



pared for 534 P. carolinus and 81 P. evolans collected with 

 the Tucker trawl during both day and night. Flexion was 

 complete at a larger size for P. evolans than for P. ca/-- 

 olinus (range: 6.7-7.5 mm versus 5.4-6.8 mm SL), and 

 planktonic postflexion P. evolans larvae were captured at 

 larger sizes than postflexion P. carolinus (range: 6.7-11.9 

 versus 5.4-9.8 mm SL). Pnonotus evolans completed flex- 

 ion at a younger age than P. carolinus (approximately 13 



