Figure 8. --Quadrat sampler used in intertidal fry studies. 



section was then sampled at random; the exact 

 location of the 3-foot square quadrat to be 

 excavated was determined from a table of 

 random numbers. The numbers chosen repre- 

 sented the distance in feet upstream and across 

 in which a specific corner of the sampler was 

 placed. Gravel was excavated to the maximum 

 depth that fry occurred, and the numbers of 

 fry, egg cases, and dead eggs were re- 

 corded. 



The total number of fry in the gravel of the 

 intertidal area of each study stream was es- 

 timated by multiplying the total area in which 

 eggs or larvae were present by the average 

 fry density per unit area. 



MIGRATION OF FRY FROM AREA 

 ABOVE TRAPS 



Duration of Migrations 



Fry migration patterns for six of the study 

 streams are shown in figure 9. In the figure, 

 Pigot Bay represents an early-run stream. 

 Port Chalmers, a late-run stream, and the re- 

 mainder, middle-run streams. 



At Indian Creek traps were installed first 

 at the mouth of the stream. On May 21 when 

 high tides caused the water to flow over the 

 tops of the traps at this location, they were 

 moved upstream to a location known to be above 



10 



