206 SPORT IN NORWAY. 
raised two feet above the ground, and was not, therefore, 
protected with such a lid. A large quantity of eggs: 
had been hatched out, when, lo and behold, one fine 
morning the young fry had nearly all disappeared! A 
number of traps were accordingly set on the floor of the 
house, and the following morning the intruder was 
captured. It turned out to be a water-rail which had 
found ingress through the mouth of a drain. 
The Dytisci, Hydrophili, and their larve, and the 
larvee of the Libellula and Agrion are also very dan- 
gerous enemies. The Libellula depressa is especially 
a deadly foe, and will even devour the two to three 
months old fish. It is extremely tenacious of life; and 
has been known after having been kept a whole day 
in spirits to recover when placed in water where there 
were young fish, and ina very short time to commence 
attacking them as if nothing had happened. 
