SCOUTING FOR GIRLS 
433 
COMMON CATFISH 
The barbels which suggest the whiskers of a cat are responsible 
for the name. This fish has no scales. Range: Eastern and Central 
United States. 
in which they are living. Fishes are found in both fresh 
and salt water all over the world and have adopted them- 
selves to many conditions; for example, certain fishes 
have lived in caves so long that they are blind ; some live 
in the coldest water, while others can revel in the heat 
of the hot springs. 
Many fishes are valuable as food and the fisheries are 
extensive industries, in which large sums of money are 
invested. 
There are four great groups of fishes : 
1. The sharks and rays, with cartilaginous skeletons. 
2. The ganoids of which the sturgeon and garpike are 
examples, with heavy plates or scales. 
3. The bony fishes — salmon, pickerel, mackerel, cod, 
halibut, etc. 
4. The lung fishes, that live partly in air. 
There are many species of sharks. Among the more 
common ones in Atlantic waters are the Smooth Dogfish 
which has pavement-like teeth ; the Sand Shark with cat- 
like teeth; the Hammerhead Shark with its eyes on 
stalks. The near relatives of the sharks are the Skates, 
