182 MARVELS OF FISH LIFE 
soon the bottom of the bottle contains thousands of 
cyclops, daphnia, water-beetles, spiders, etc. The 
contents of this bottle are then emptied into the 
tubs. 
These minute creatures multiply so rapidly that in 
a week or two the water in all the tubs is seething with 
life. When wanted for fish food, these crustaceans are 
collected in a similar manner from the tubs, the water 
that passes through the bottle being allowed to run 
back into the tubs. 
While on a fish photographic excursion the photo- 
grapher will have the time and opportunity to procure 
his own specimens, but should he not be a sufficiently 
expert fisherman to do this for himself, it is always 
possible to get specimens from other anglers, or from 
the professional fisherman, provided he is willing to 
carry them home in a can. If, however, he should ask 
a fisherman to get the specimens, he should be sure to 
mention the largest number of fish that he desires to be 
put in the can, for the fisherman, as a rule, stuffs the can 
so full that frequently the specimens are all dead before 
they reach you. I well remember lending a large can 
to a shrimp trawler in order to procure a number of 
small flat fish. It came back two-thirds fish and one- 
third water, there being some three hundred specimens 
in all, and not a living fish among them ! 
The procuring of specimens for photography at 
home is a much more difficult matter. My living fish 
have been obtained in various ways. 
