TROPICAL AQUARIUM FISHES 73 
the form of a ring with a roof over it, leaving only an opening for the 
female to enter to deposit her eggs. The nest is glued together by a sticky 
substance exuded from the body of the male fish, who assumes a bright 
red color in parts of the fins at this period. After the female has deposited 
her eggs he drives her away, looking after the nest and young himself until 
they are about 10 days old. He is very pugnacious at this time and will 
attack any living thing that approaches. Different species probably vary 
somewhat in details of breeding habits, An English authority claims that 
in Nature the male persuades as many females as possible to deposit their 
eggs in his nest. The Stickleback is well known as an aquarium fish, but 
it should nct be kept with other fishes. It prefers to eat daphnia or bits 
of small worms. 
THE CHAETODON 
Chaetodons build their nests directly among plants off the bottom. 
These fish are less of fighters and depend more upon hiding their young 
Fic. 55. Tue Cuaetopon (Enlarged one-quarter) 
than upon boldly protecting them. The Chadetodon is one of the most 
charming of all aquarium fishes. Many of them are exported to Europe, 
where they are highly esteemed and bring good prices. This fish has 
quite an individuality—its peculiar markings, precise movements and 
genteel manners setting it quite apart from most other fishes. It swims 
principally by use of the pectoral fins, which are so transparent as to be 
scarcely observable, giving the fish the appearance of moving about by 
