Destruction of Mosquitos by small fish 
in the West Indies, 
by STE DANIEL IMORRIS. KLEIN AGET DZ CIS 
As a supplement to the interesting information placed before the 
Congress by Professor F.V. THEOBALD, F. E S., it would be useful 
to place on record the valuable services rendered by a small fish 
(Girardinus peciloides), popularly known as « millions ». In 1905 
Mr. C. KENRICK GIBBON suggested that probably the absence of 
malaria at Barbados was due to the presence in the ponds in that 
island of the small fish above referred to. The Mosquito usually 
regarded as causing malaria is a species of Anopheles. The breed- 
ing places of this are shallow streams, pools and swamps. So far, 
this Mosquito is unknown at Barbados, and notwithstanding the 
frequent and intimate communication between Barbados and the 
neighbouring islands where malarial fever is more or less endemic 
the Anopheles has not established itself. Three inferences have 
been drawn from this fact : 1° That the Anopheles has failed to 
obtain a footing at Barbados because it breeds in localities where 
the Girardinus abounds; 2° that in consequence Barbados conti- 
nues free from malarial fever; 3° that if the Girardinus were intro- 
duced into countries where the Anopheles is abundant, both the 
Mosquito and malaria would probably be greatly diminished, or 
eradicated. In a recent publication issued by the Imperial Depart- 
ment of Agriculture in the West Indies Mr. BALLOU gives a brief 
account of the habits of Girardinus, its relation to Anopheles, and 
the manner in which the fish may be successfully introduced to 
