132 GOLDFISH VARIETIES AND 
they will last. In hot weather they can be kept about three days and in 
October about two weeks. 
A method of carrying live food which is growing in favor is to crate 
them (without water) in layers in a box. Frames about 10 x 12 inches, 
made of 7£-inch square wood, are covered on one side with cheesecloth. 
These are floated in the water, the daphnia dropped in, spread out evenly 
and placed in carrying box which, of course, needs to be airtight. The 
number of layers are only limited by the depth of the box. Daphnia may 
be spread to a depth of about 4 inch, but mosquito larve may be piled to 
¥Y inch without injury. 
In transferring from carrying pails to stock tanks it is well to first 
pour in small portions to a white enamel basin which enables one to 
carefully go over the catch and remove any insect enemies. (See page 
156.) If the daphnia are too thick to be readily examined, some water 
should be added. A little care in keeping out the enemies at the start is 
energy well invested. Most of the enemies and the dirt may be sifted 
out (under water) by using a screen just large enough for the daphnia to 
pass through. 
A beginner will do well to make the acquaintance of an experienced 
daphnia collector and go along with him on a trip. There are now 
aquarium societies in many of the large cities, part of their activities 
being the dissemination of such knowledge. All those interested in 
aquaria should have either active or corresponding membership in one 
of these organizations. If return stamps are enclosed the publishers of 
this work will always be glad to put the beginner in touch with the 
nearest society. 
All beginners seem to have the idea that sufficient daphnia can be 
raised in a tub or trough to feed with. This has been tried many times 
but never with any degree of success. If the daphnia pools are too far 
distant to make collecting practicable it is best to try to inoculate some 
suitable pond nearby, but there should be no fish in the pond. Daphnia 
if not crowded may be shipped quite a distance. There are several Phil- 
adelphia collectors constantly making shipments in season. 
The practical way to raise daphnia for food purposes is described 
in the chapter on Wholesale Breeding (page 62). 
Cyclops. Wherever Daphnia are found, Cyclops is pretty sure to be, 
and also in a great many places where the former does not exist. They 
are crustacea of about the same size and color as Daphnia, but under 
close examination are of entirely different structure and also of different 
action, going rapidly through the water in straight lines with a jumping 
movement. Like Daphnia they are divided into many species and are 
