12: 

 11 - 

 10 



9 



8 



7i 



6 



5i 



4 



3 



2- 



1 : 



2.0 2.5 3.0 3.5 



4.0 4.5 5.0 5.5 6.0 6.5 

 LENGTH (MM) 



7.0 7.5 8.0 8.5 9.0 



Figure 31. Length-frequency distribution of larval winter flounder entrained at MNPS from 1976 through 1985. 



annual entrainment numbers should be undertaken to establish the most credible estimates of entrainment 

 for impact assessment. 



The median entrainment density has declined since 1983, which agreed with the decline in the cumu- 

 lative frequency in Stage 2 through 4 larvae at this station (Table 34; Fig. 14). The median densities 

 may be grouped into high and low years based on the lack of overlap of the 95% confidence intervals 

 with three low years (1977, 1978, and 1979) and four high years (1976, 1980, 1982, and 1983). The 

 confidence intervals of the remaining three years (1981, 1984, and 1985) overlapped either or both of the 

 low or high groups. A similar but slightly different grouping of actual entrainment estimates was found 

 with three low years (1977, 1979, and 1981) and four high years (1976, 1980, 1982, and 1983), with 

 remaining years overlapping. The total entrainment estimates took into account the volume of water 

 withdrawn for condenser cooling and may vary according to plant operations. 



110 



