116 PISCES (THE fish) 



(e) Have you found any evidence that the fish can taste? 



(f) Where is the fish most sensitive to touch? Is it sen- 



sitive to a jarring or stirring of the water if there 

 is no sound? 



(5) What means of defense has this fish? 



(6) Do fishes ever play? 



(7) Do they ever sleep? 



THE SUNFISH 



Morphophysiologic Study 



A. External Morphology 



1. Shape? Use of this particular shape to the sunfish? 



2. Length of sunfish from tip of nose to caudal fin? 



3. Thickness. 



(1) Laterally? 



(2) Dorsoventrally? 



(3) Is it compressed or flattened? 



4. Covering. Naked, ctenoid scales, or cycloid scales? 



5. Dorsal surface. 



(1) Shape? 



(2) Color? 



6. Ventral Surface. 



(1) Shape? 



(2) Color? Why this difference in color? 



7. The Fins. 



(1) Paired Fins. 



(a) Number? 



(b) Use? 



(2) Unpaired Fins. 



(a) Number? 



(b) Use? 



(3) Caudal Fin. Is it homocercaP or heterocercaP ? 



8. Nostrils. 



(1) How many nostrils has the sunfish? 



(2) Do they open into the mouth? (Thrust a tipped bris- 



tle or a flexible probe into the nostrils and see.) 



(3) Use of the nostrils to the fish? 



1 See Glossary, Part II, " Economic Zoology." 



