The Mosquito Must Go 



21 



been found necessary to find a way to introduce and distribute 

 killifish throughout the ditches. 



The unit of the drainage system for salt-marsh mosquito 

 suppression which 15 years' experience has shown to be best, is a 



BERGEN COUNTY 



MAP NO 4 



LEGEND 

 STATE DITCHING 

 COUNTY DITCHING 



Fig. 8. A Salt-Marsh Drainage System 



ditch 10 inches wide by 30 inches deep with straight, smooth 

 sides and an even bottom. These unit ditches are led into 

 natural creeks wherever such action is possible, but run into a 

 specially cut outlet ditch when natural outlets are not obtain- 



