MINNOW AND PERCH. 



Although not so easy to preserve in the aquarium as 

 the foregoing, a little extra attention will be sufficient 

 to keep it in good health for a long period of time. 



Fig. 22. 



Common Perch (Percafluviatilis). 



It grows from 4 inches to 6 inches in length, and 

 forms a very conspicuous object, moving to and fro 

 over the bottom of the tank in search of caddis- 

 worms, blood-worms, Crustacea, &c. It loves to swim 

 boldly about with its dorsal fin erected, and then 

 looks as if engaged upon some crusade. 



