Table 7. Estimated* number of lobsters Impinged by mortb for Unit 1 

 nd Unit 2 Intakes and total ImplnRed for 19B3. 



* These values, based on 3 days of sampling per week, are extrapolated 

 based on flow rates to represent the estimated total number impinged 

 per month. 



** Refueling outage. 



*** Unit 1 sluiceway operation December 16, 1983. 



at Unit 2 (June-December). The annual total estimate (1496) for both units 

 combined, was within the range of previous years (506-1979). The number of 

 lobsters impinged varied seasonally, with highest impingement occurring 

 during the summer months, concomitant with peak trap catches and increased 

 water temperature. 



The size frequency distribution and sex ratios for lobsters caught on 

 Units 1 and 2 traveling screens in 1983 are presented in Figure 12. The 

 mean CL at both units (58.9 mm) (Unit 1 59.9 mm; Unit 2 56.8 mm) was within 

 the range reported in previous years (48.6-64.9 mm) but smaller than the 

 trap catch value (NUSCo 1983b) . l.arger sized males were impinged more 

 frequently than large females, thus the mean CL for impinged males was 

 greater (Unit 1 61.9 mm; Unit 2 59.2 mm) than the mean CL for impinged 

 females (Unit 1 56.3 mm; Unit 2 53.0 mm). The greater number of smaller 

 sized lobsters impinged relative to the number caught in traps is because 

 the traps allow for escapement of the smaller sized individuals. The sex 

 ratio of 1.0:0.58 (M:F) was similar to the 1982 value of 1.0:0.50 (M:F) and 

 reflects the higher abundance of males in near shore waters, also evident 

 in the trap catches at JC and IN. 



19 



