FISHERY BULLETIN: VOL. 69. NO. I 

 90° 80° 



Figure 1. — Location of plankton stations occupied by four research vessels participating in EASTROPAC I. 

 Symbols for vessels indicated in legend above. Samples collected from Argo are numbered as 11.000 series 

 (as 11.022, 11.173), samples from David Starr Jordan as 12.000 series, Rockaway samples as 13.000 series and 

 Alaminos samples as 14.000 series. 



f erence of the accumulated knowledge and skills 

 for work in other areas, such as, in this in- 

 stance, the eastern tropical Pacific. My study 

 was undertaken to demonstrate the value of 

 identifying all elements of the fish fauna of 

 tropical regions, rather than restricting interest 

 to scombrid larvae. Much information can be 

 gained for little extra expense (a few percent 

 of the cost of collecting the material at sea) . 

 Of equal consequence, identification of all kinds 

 of fish larvae can be made more critically in- 

 cluding scombrid larvae. 



METHODS OF MAKING 

 ZOOPLANKTON COLLECTIONS 



Three nets, differing in size and in coarseness 

 of mesh, were employed to collect zooplankton 

 and micronekton on EASTROPAC cruises. In 

 this paper I am concerned primarily with 

 oblique hauls made with the net of intermediate 

 size and mesh — a net, 1-m mouth diameter, con- 

 structed of 505 /J. nylon (Nitex) cloth, with ap- 

 proximately a 5 to 1 ratio of effective straining 

 surface (pore area) to mouth area. This net 

 was paired in an assembly frame with a finer- 



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