Throughdut the sampling program, fish were identified to lowest practical taxon and measured to 

 the nearest millimeter in length. From 1969 to 1980, standard length was measured. During J9S1-J982, 

 both standard and total lengths were measured and a regression was used to convert previously recorded 

 standard lengths to total lengths (NUSCo 1984a). When more than 50 individuals of a taxon were collected 

 in a replicate, a representative subsample was measured; otherwise all fish were measured. Catch was 

 expressed as number of fish per 30 m haul. 



Special seine study. In 1982, the seine program was evaluated to determine if it would adequately 

 address the potential impact of the three-unit thermal plume. The sampling frequency was increased to 

 biweekly from April through October to achieve a 50% detectability level for the dominant shore-zone 

 taxon, the silverside. MacCall et al. (1983) recommended this level as a criterion for long-term impact 

 a.ssessment programs. Because the thermal plume was projected to encompass .Jordan (\)ve and raise the 

 water temperature 0.3°C on the flood tide and 1.2''C on the ebb, sampling was scheduled for both tidal 

 stages from April through October, when most fish are in the shore zone. Initially (April-.Iuly 1984), 



Table !>. Summary of seine sampling program during 1969-1985. Three seine hauls were made with a 9.1-m, 0.fi,')-cm mesh seine 

 net at each station (see Figure 5). Unless otherwise indicated, all samples were collected during the 2-h period prccccding high tide. 



Ouring 

 During 



1975 only one haul was made at IN, three hauls were made at SP. 



this time period, JC and WP were sampled biweekly, high I ebb; GN and SS were sampled monthly, h 



Rh. 



14 



