ROTHLISBERG and MILLER: LARVAL 1'A.XDAI.I >' JORDASI OFF OREGON 



Figure 4.— Drift bottle-returns. 1972. 

 Number, rate of return, and direction of 

 drift summarized by quarterly com- 

 ponents (from data supplied by M. J. 

 Hosie, Fish Commission of Oregon, and 

 W. Gilbert, Oregon State University 

 School of Oceanography). 



< 



Q 

 < 



o 



& 



CO 



Z 



LSJ 



< 



o 



I— 



LL_ 



o 



100 

 80 

 60 

 40 

 20 



- 3 MARCH 1972 - 



- 15 MARCH 



C* 100 r 



80 

 60 

 40 

 20 



n--15,r = 10.4 



rm 





n:76, r--52.8 



28 MARCH 



n=274, r--476 



11 APRIL 



n=34,r = 35.4 



+ 



20 APRIL 



n--298 

 r = 29.6 



I ' ::::::: ' i 



-22 MAY 



-n=12,r=4.2 



I JUNE 



n=31, r--76 



21 JULY 



n=29, r=10.1 



mm, 



0-89 90-179 180-269 270-360 



0-89 90-179 180-269 270-360 



DIRECTION OF DRIFT 



summed for each station over all cruises (Fig. 7). In 

 1971, Zoea I, though most abundant inshore, was 

 spread over the entire 60 nmi of the transect. This 

 trend continued to Zoea V, but increasing numbers 

 appeared in the two seaward stations for II through 

 V. By Zoea VI numbers were much diminished and 

 most larvae were outside 15 nmi. This trend persist- 

 ed through Zoea XIII. Small captures of late larvae 

 and juveniles make generalizations for them 

 difficult. 



Larval Distribution and Abundance of 

 Pandalus jordani in 1972 



No cruises were made in 1972 until 4 March, when 

 small numbers of young larvae (I and II) were found 

 between 3 and 15 nmi (Fig. 6). On 16 March there 

 were many Zoea I at 3 and 5 nmi and lower numbers 

 farther out. Small numbers of Zoeae II and III were 

 also present. A 30-mi transect in late March showed 

 the center of abundance was at 10 nmi; mostly they 



459 



