The Inhabitants of the Aquarium 305 



into a fish-stocked aquarium may indicate 

 one way to fight the mosquito pest. Before 

 long the fishes will begin a campaign of ex- 

 termination, and soon the last of the larvae 

 will have disappeared. While crude oil and 

 other chemicals can and have been used 

 very effectually to destroy the mosquito 

 larvae, i-t is to be regretted that they also 

 kill fishes, newts and other enemies of the 

 pest. Thorough drainage of a mosquito in- 

 fected territory is the only lasting and ef- 

 fective remedy. Clear and deep bodies of 

 water well stocked with fish will be com- 

 paratively free from the larvae and should 

 not be spoiled by the indiscriminate appli- 

 cation of chemicals, with doubtful effects. 

 By stocking ponds which are the breeding 

 places of the mosquito, with gold or other 

 aquarium fish, a good profit can be secured, 

 with hardly any care whatever, as the fish 

 will thrive very well on nothing but the 

 nourishment offered in the larvae. 



