JAMIESON and PHILLIPS: OCCURRENCE OF CANCER CRAB MEGALOPAE 



sampling date, 16 and 17 April, but maximum abun- 

 dance (unweighted as to diel time of sampling) 

 occurred in late May and the second week of June 

 (Fig. 5). Cancer magister megalopae were collected 

 as late as 24 August, the last sampling date, but 



relative abundance along the transect was low after 

 the beginning of July. 



Cancer oregonensis megalopae were caught in 

 April but occurred in abundance only in the late May 

 and mid- June surveys, with peak abundance in June. 



1000 



100 120 140 160 180 200 220 240 260 



CALENDAR DAYS 



Figure 5.— Neustonic abundance of megalopae observed along the transect line during April to August 1985 surveys. 



Table 3.— Scaling values used to standardize the actual number of megalopae caught 

 (unsealed) to the estimated number which would have been caught at the times of peak 

 nocturnal abundance, 22:40 and 23:40 hours, for Cancer oregonensis and C. magister, respec- 

 tively, on 14 and 15 June 1985. * = Value uncertain because of time of sampling. Values 

 rounded to one decimal place. 



533 



