Discussion 211 



they eat fairly large quantities. I would conclude that these angel- 

 fish are not strict herbivores but that they must have some animal 

 food. 



Nigrelli: That is true, because we keep small angelfish in our 

 aquarium and feed them with clams, etc., and no algae at all, and 

 they grow to a good size. However, the algae may prevent growth 

 by producing antibiotics. 



Gerking: We wonder now whether there is a strictly herbivorous 

 fish. 



V 



