FISHERY BULLETIN: VOL. 70, NO. 4 

 90" 80' 



Figure 1. — Location of plankton stations occupied by three research vessels participating in the second multivessel 

 EASTROPAC survey (ETP II). Symbols for vessels indicated in legend above. Samples collected by Was/iingrfon 

 are numbered as 45.000 series (for example 45.016, 45.140, 45.387), samples from J/jidawnied as 46.000 series, from 

 Rockaway as 47.000 series. 



monitoring cruises, spaced at bimonthly inter- 

 vals between the multivessel cruises; coverages 

 equivalent to the monitoring pattern were sum- 

 marized for ETP I and ETP II, in order to com- 

 pare the results of six bimonthly coverages of 

 the same area (Figure 2). The monitoring pat- 

 tern lacked coverage in the nearshore portion 

 of the EASTROPAC pattern that was occupied 

 by the inner vessel on multivessel surveys. Ad- 

 ditional seasonal information about composition 

 and relative abundance of fish larvae in this 

 area was supplied by a "zig-transect" of 50 sta- 



tions occupied by the RV Oceanographer of the 

 Environmental Science Services Administration 

 during November 1967 — 2 to 3 months after 

 ETP II coverage of this area (Figure 2), 



The methods of making zooplankton hauls on 

 ETP II were identical to those previously de- 

 scribed for ETP I (Ahlstrom, 1971). This pa- 

 per deals solely with collections obtained from 

 oblique hauls made with a net, 1-m mouth di- 

 ameter, constructed of 505 fi nylon (Nitex) 

 cloth, with approximately a 5: 1 ratio of effective 

 straining surface, i.e., pore area to mouth area. 



1154 



