Discontinuing the identification of entrainment eggs (October 

 through March) was proposed because: 1) the eggs entrained during October 

 through March represent only the very beginning or end of the spawning 

 season for several species; 2) the eggs of several species which spawn 

 primarily during fall and winter are not susceptable to entrainment 

 because they are demersal; 3) the primary spawning area of some species 

 is outside the source area for condenser cooling water; 4) the number of 

 eggs entrained during October through March is low compared to individual 

 fecundities. 



The proposed change in the entrainment sampling frequency was based 

 on variance component estimates of the dominant 10 fish larval taxa 

 utilizing a nested factorial model and five years (1976-1980) of ichthyo- 

 plankton entrainment data. Variance due to temporal components (day, 

 week) was shown to comprise more than 67% of the overall variance for 

 each taxa tested. Examining variance estimates on the weekly means of 

 dominant larval taxa (based on a modification of the equation by Sokal 

 and Rohlf 1969), showed that greater efficiency can be accomplished 

 through increased consideration of the temporal component (increase in 

 the days sampled from three to four) . A change in entrainment sampling 

 frequency to the proposed one day, one night sample, four days per week 

 would have virtually no effect on sensitivity of analyses on the taxa of 

 greatest importance (Table 3). At the same time it represents a major 

 reduction in effort for the entrainment ichthyoplankton program. 



Offshore Ichthyoplankton Program 1973 through 1975 



The 1973 through 1975 offshore iphthyoplankton program, conducted 

 by Battelle (W.F. Clapp Laboratories), was designed to provide information, 



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