158 Fresh Water Aquarium 



equally well developed; while some show 

 them on all the fins, others have them only 

 on the dorsal fin. Age and habitat may 

 have something to do with these variations. 

 The dorsal fin is very long, extending over 



Fig. 77. Rock Bass, AmblopJitcs rupestris. 



nearly the whole length of the back. The 

 young fish shows a very conspicuous oval 

 black spot separated by a glassy border 

 from a bright orange band, running nearly 

 around the spot, leaving only an opening 

 near the top. On the older fish nothing but 

 the black spot remains. 



