Table 3. — Number of species caught, expected frequency of catch, and chi-square values with the standard trawl and 



the electrical trawl with array 1, power off. 



Table 4. — Number of species caught, expected frequency of catch, and chi-square values with arrays 1, 2, and 3 



with power on and power off. 



increase its income by a factor of 0.32 or 32.0%, 

 up from $18,000 per year to $23,760 per year. 

 This increase takes into consideration the re- 

 duction in catch experienced when arrays were 

 added to the standard trawl in the first exper- 

 iment. Out of the $5,760 increase would come 

 the initial cost of the electrical gear, in this case 

 approximately $1,200. With arrays 1 and 3, 

 the fishing operation would show a loss of income. 



Gear Selectiveness 



To permit an evaluation of the gear's electrical 

 selectivity to fish size, species composition and 

 frequency of occurrence were taken for all com- 

 mercially important species every fifth pair of 

 drags. 



Species Composition. — The species composition 

 of the catches is presented in Tables 1 and 2 by 



